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]]>Me and my team did it to inspire and, more importantly, to create the tactics and details around how you, your organization, your startup can know more about start working on coffee business.
However this deck continues my tradition of training step-by-step guides that give you the exact information I’ve used to run my introduction to coffee class. That includes references like :
Coffee Origins . Biology of coffee plant . Coffee’s Growing Region . Coffee’s Journey . Current Coffee Industry . Coffee origin . How coffee is traded . Species . Varieties . cultivar . Harvesting . Processing . Processing Flavor Description . Quality Control . Roast Process . effect on taste . Roasting graph . Different roast style . storage . Coffee freshness . Humans Senses . Taste . SCA Flavor Wheel . Effect of geographical position on coffee flavor . Cupping . How to do coffee cupping . Brew methods . Brewing parameters . Filter material . Coffee extraction definition . Water Quality . What is Specialty Coffee / Organizations in Specialty Coffee / waves /.
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]]>The blending of coffee is as old as coffee itself. Although the techniques vary, blending is used to optimize aroma, body and flavour: the goal is to make a coffee that is higher in cup quality than any of the ingredients individually, and, extremely important, maintain consistency in the final roasted product.
Each batch has it own personality in terms of taste, smell, body, chemical resilience to the hydrolytic action of water, etc., and blending can complete it and round it up or level it off.
Most espresso blends are based on high quality Brazil arabicas, some washed, some dry-processed. They often involve some African coffees for winey acidity or flowery fruitiness, or a high-grown Central American for a clean acidity. Some roasters add a little robusta to increase body.
Dry-processed coffees are responsible for the attractive ‘crema’ on the cup, among other mechanical factors in the extraction process Wet- processed Central Americans add positive aromatic qualities. Robustas are used in cheaper blends to increase body and produce more foam.
Besides subjective quality , blending also assists in maintaining objective quality, because the more complex a blend, the easier it is to maintain constant quality when some ingredients change.
With the exception of a few countries that pay considerable attention to quality, the majority of producer countries often add up small batches produced by different growers to form larger ones of a size required by roasters. Although care is taken so that only batches of equivalent quality are blended, the result of this deplorable practice is often a quality downgrading to a level below that of the best fractions.
Coffee history records a number of popular blends that are published and available for public consumption. Other ‘proprietary’ blends tend to
be closely guarded, with the information staying within a company structure. Proprietary or signature blend leads consumers to equate a particular coffee profile with a particular brand image. Blending requires the expert skill of knowing each ingredient coffee, having in mind a clear cup profile as the goal, and knowing how to achieve it.
Blending may be done before or after roasting. Blending before roasting is traditionally used by retail and institutional roasters. In this method coffees with similar characteristics are combined and roasted to the same development. Generally, professional in-house ‘cuppers’ evaluate the results of the blend, adjusting components if necessary to satisfy taste requirements and standards.
Advantage: Consistency of product.
Disadvantage: Inability to optimize the character of each coffee.
Blending after roasting is the method traditionally used by many specialty coffee roasters. The flavour profile development requires that each individual coffee used in the blend be roasted separately to optimize flavour. In other words, each coffee will have a different time and temperature setting. Consequently, the final roast development will be different for each coffee used in the blend. After roasting, each component of the blend is individually tasted (cupped), as is the final blend composition.
part of ESPRESSO COFFEE book by Andrea illy
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]]>general
Wet processing of coffee often includes a fermentation step, cocoa always does and tea processing has a step that is sometimes called ‘fermentation’. In food production there are many fermentations that confer nutritional, taste, stability or all of these benefits on raw materials. Sauerkraut, yoghurt, salami, tempe, uji, soya sauce, beer, and cheese are a few examples of scores of food fermentations known around the world.
Coffee fermentation, as we will see, is conducted for rather different reasons. The term ‘fermentation’ represents microbial growth as it occurs on any suitable substrate. In fact, in the early days of microbiology, the organisms that grew to spoil food were originally called ‘ferments’, rather than ‘microorganisms’, hence their growth was termed ‘fermentation’.
A second, narrower sense of ‘fermentation’ is often used in microbiology, which we will not use in this discussion: microbial activity in the absence, or near absence, of oxygen. However, it is worth remembering that vigorous microbial metabolism often depletes oxygen (and so augments CO2) thus oxygen limitation is usually an important aspect of food fermentations. It is an important factor in the selection of a fermentation community from the initial community of microorganisms. Bacteriologists also speak of fermentative organisms – microbes that do not require oxygen for respiration and oxidative species that do require oxygen for growth. In referring to organisms, we will use these bacteriological terms.
The so-called fermentation of tea raises an important aspect of some food fermentations. The changes wrought in tea by ‘cutting, tearing, curling’ (CTC), followed by aeration are produced by plant enzymes, not microbial activity. There is often a potential ambiguity in the roles of microbial and plant metabolism in processing systems since often both kinds of organisms are simultaneously active at some time during the process. Cocoa fermentation is required for flavour development although it also aids separation of seed from fruit tissue. Coffee fermentation, though it may have an impact on flavour development, is not required for flavour development and is conducted essentially to aid a similar separation of tissues.
Microorganisms occur naturally on and in the coffee fruit in increasingly large numbers as the fruit matures. The seeds themselves become active with maturity and a proportion of seeds will have undergone the early changes associated with germination by the stage of full ripeness. The fruit itself has no capacity to store, unlike apples and oranges, for example. Resident micro-organisms become active soon after harvest and signs of (unintended) fermentation can be measured soon after harvest. The object of our discussion here is principally the scheduled fermentation used to degrade the mucilaginous mesocarp tissue of the fruit.
Structure of the Coffee Fruit
The product of coffee are the seeds which are produced in small cherry-like fruits, normally in pairs. Of particular significance in understanding coffee processing are the three tissues of the fruit: the epidermis (or skin); the mesocarp (or mucilage) and the inner integument (or parch).
The epidermis is typical of plants, comprising a layer of small cells, including stomata, their cell walls impregnated with suberin, a water impermeable wax. Beneath this is the mesocarp which consists of many layers of parenchymatous cells – undifferentiated thin walled cells and which, in the ripe fruit, are large with large vacuoles. The inner integument, which is tightly adpressed to the seeds, is a very tough and relatively inelastic layer no more than two or three cells thick but comprising cells with considerable secondary thickening, i.e. it is essentially woody. Xylem tissue, presumably once connected to the funiculus (the tissue that connects the seed to its nutritional supply during development), can be easily seen in the integument by direct observation, running parallel to the surface of the tissue.
Before ripeness, the skin, mesocarp and parch form a tough and tightly adpressed covering to the seeds which are relatively soft at this stage. Attempts to remove the seeds at this point will invariably break the seeds. When ripeness is reached, the mesocarp becomes soft (hence the term mucilage), and the seeds relatively hard. If mechanical shear is applied now, the mesocarp splits to produce one fraction of skins with some mucilage and a second fraction of seeds tightly covered in their integument (parch), which is covered in a fairly thick layer of mucilage. this second fraction that is fermented to enable removal of the mucilage from the seeds.
It can be that the mesocarp of robusta fruit is thinner than that of arabica. It is, however, tougher and more difficult to remove from the parch. The mesocarp adhering to the parch is chemically quite different to that adhering to the skin. It lacks the characteristic anti-nutritional compounds such as tannins, free phenolics, caffeine and other alkaloids that make skins refractile even in composting. A tonne of ripe arabica cherry yields about 120kg of mucilage adhering to the beans. About half of the 17kg of the dry mass of this mucilage is sugars or some 8.5kg of sugars. This is the source of fermentable carbohydrate for the coffee fermentation. There are also minerals, particularly Ca, K and P, and amino acids present.
Pectic substances amount to about 35% of the dry mass of the bean-associated mucilage. They comprise essentially polygalacturonic acid chains (covalent bonds typical of all polysaccharides) that are cross-linked, via Ca+2 ions through the carboxylic groups of the uronic acids. As will be discussed below, the esther part of the carboxylic group and the glycosidic bonds of the chains are susceptible to attack from enzymes.
Wet Processing and Dry Processing:
Coffee must be dried in order to stabilise it and preserve quality. Wet processing refers to various methods where the seeds are mechanically separated from the skin of the fresh fruit (pulping) before drying and may or may not include a fermentation step. Dry processing refers to methods where the fruit is either dried directly or is disrupted, but the seeds not separated from the fruit tissues, then immediately dried. The decision as to which method to employ is based on economic considerations. Washed coffee commands a higher price, but is more expensive to produce.
A large proportion of arabica coffee is processed by the ‘wet method’ and a high proportion of this has a fermentation step in it. The market for washed robusta is limited, and the premium offered above dry processed robusta is small. Therefore, only a small proportion of robusta coffee is processed by the wet method, the bulk of this in India.
Capital costs for wet processing are high. Power, provided by mains electricity, petroleum powered generator or direct drive arrangements is required for even moderate sized operations. A good water source and fairly well-designed plumbing is also required. A facility to house equipment and various sealed channels and tanks are also necessary. The equipment comprises a pulper as a minimum, and typically includes a hopper, siphon tank, post pulping screen, washer or washing channels and skin-drying screens.
Operational costs are also higher for wet processing. Harvesting is particularly expensive because it requires the very labour-intensive selective harvesting system – only ripe cherries can be pulped. This is beginning to change due to new equipment that can accept (but not pulp) immature cherries. Further costs accrue because cherries affected by coffee berry disease, immature or over ripe cherries must be separated and sold as low grades, returning a low price.
There are generic differences in taste attributes between washed and natural coffees and both are required for different market segments: wet processed coffee yields a ‘softer’ cup with less body and higher acidity while the ‘arabica naturals’ excel in their body and bitterness while lacking acidity. Within the classification of washed coffees there are two commercial market segments: ‘Colombian milds’ and ‘other milds’, a distinction that is delimited by origin. Either may or may not be fermented and the ‘other milds’ characteristically have more body and less acidity than ‘Colombian milds’.
Coffee Fermentation:
Coffee is fermented, as mentioned above, to ease the removal of a layer of mucilage from the seed/inner integument to which it adheres. This is not to say there are no taste implications to this step. In contrast to coffee, the fermentation of cocoa is required to develop the flavour of the product though much of this is apparently accomplished by cocoa enzymes, rather than microbial activity. In coffee too, it has long been held that fermentation has a beneficial effect on flavour but lately, this has been disputed and many quality experts now accept the contention that mechanically washed coffee (with no fermentation) can be of comparable quality to the fermented product. What is beyond dispute is that badly conducted fermentation can result in disastrous losses in quality.
In general coffee fermentation is conducted as ‘dry fermentation’ where the mass of mucilage and parchments are not covered with water. The temperature of either of these processes is scarcely raised above ambient temperature reflecting the lack of oxygen diffusion to the heart of the mass. In contrast, fresh cherries held in woven sacks, an arrangement that has about 50% space, can heat to over 50OC within 36h. From a taste quality point of view, the fermentation step and operations either side of it (pulping and washing) are said to require conformance to certain criteria.
Firstly, the fermentation mass must comprise uniformly parchment coffee with a minimum of crushed or naked beans, skins and un-pulped coffee. Crushed and naked beans indicate beans with severe insect damage and/or a pulping machine being set too narrow. Presence of skins suggest the pulping machine is in need of maintenance and/or the water feed was too low. Un-pulped beans suggest that the pulper was set too wide and/or the removal of dried fruits has been ineffective.
Secondly, the fermentation must be concluded as soon as possible after sufficient mucilage degradation has been accomplished. This is ascertained by rubbing the parchment between your fingers to note whether the grittiness of the parchment surface can yet be felt.
Thirdly, after washing, mucilage must be completely removed from the parch before drying. Curiously, a product called descascado, produced with no attempt to remove mucilage, being pulped and immediately dried, can be a coffee of the highest quality.
The most important of these conditions is the temperature and the length of the fermentation. As mentioned above, coffee fermentation is not significantly self- heating so prevailing climatic conditions control temperature. The period of fermentation, in practice, can only be concluded when it is possible to take the coffee to the next two steps: washing and either soaking or drying. This normally occurs first thing in the morning since the afternoon and evening is reserved for pulping operations. Given that pulping always takes place in the late afternoon through the evening and requires everyone’s attention, fermentation periods will tend to be about 18h, 40h or 64h. Robusta usually requires at least one day more than arabica.
Microbiological aspects:
The outcome of a process like fermentation is a consequence of what goes in and what conditions are experienced during the fermentation. We have seen that there is about 8.5 kg of sugar in the pulp of 568kg of pulped coffee and another 6kg of pectic substances. The balance of the 17kg of dry matter is ash, amino acids, cellulose and so forth. Most of the organisms are provided by the mucilage community with some from the processing water and incidental skins, etc.
However, the conditions, as they develop, provide exceptionally powerful selective pressure toward fermentative organisms that can thrive at low pH. The fresh mucilage has a pH of about 6.5. This falls rapidly to a minimum of about 4.1 to 4.3. Although data is lacking, it is clear that oxygen tension falls with the fall in pH, both concomitant with growth. Typical of food fermentations, the ‘wild’ microbial flora of the raw material changes quickly and completely to species that were present, but rare, in the fruit-inhabiting community.
Studies of ‘wild’ fermentations are very arduous to conduct because of the sheer numbers of organisms and taxa and the difficulties in accurate enumeration and identification of them. The nomenclatural problems of synonymy and teloemorph/anamorph names make comparing different studies difficult. New methods based on DNA PCR amplification and gel electrophoresis which allows direct analysis of the fermentation liquor without an isolation step, may provide a means to solve these severe practical problems in future.
In general, the fermentation can be characterized as a mixed yeast/bacterial fermentation. Kloekera apiculata (=Hansenispore apiculata = Saccharomyces apiculatus) and Hansenispore uvarum are reported to dominate the yeast population with other yeasts such as Pichia kluyveri (=P. fermentans) and Kluyveromyces marxianus (=Candida kefir = C. bulgericus). The yeast species are fermentative and the dominant species share the characteristic of only assimilating and fermenting glucose amongst the usual sugars tested to identify yeasts.
The bacterial side of the fermentation is conducted by lactic acid bacteria, some Enterobacteriaceae and Bacillus. The most common bacteria to produce pectolytic enzymes are Pseudomonas (P. fluorescens, for example) and Erwinia (E. carotovora, for example). Of these only Erwinia is fermentative and, in fact, the presence of Pseudomonas is difficult to demonstrate in fermentation liquors. In general, the lactic acid bacteria have been reported to be more numerous than the Enterobacteriaceae.
Analysis of several fermentations under the project “Enhancement of Coffee Quality Through the Prevention of Mould Formation” has shown that the balance between yeasts and bacteria can vary widely, such that some are primarily bacterial and others dominated by yeast. It is not clear how the outcomes of these two types differ, or why it should differ.
The conditions of low oxygen tension and high water activity dictates that the oxidative, mesophilic species of Aspergillus capable of OTA production will not thrive during fermentation. In laboratory studies, large numbers of spores, introduced into the fermentation mass at the beginning of fermentation did not result in any OTA appearing in the beans and the organism (A. ochraceus) could not be recovered from the beans after drying.
this test is only valid for models where spores, let us say from the fruit skins or soil contamination, are the source of the OTA producer. In fact, a proportion of beans harbour these fungi, infected before harvest, and there is some evidence to suggest that fermentation can kill them in the beans. However it is clear that fermentation does not always do so. In other tests where pulping was delayed for up to six days after harvest, the protective effect of fermentation against OTA accumulation was not observed. This could be interpreted as there being some threshold biomass above which the mesophilic fungi can survive the fermentation well.
The presence of skins with the parchment is unlikely to affect the fermentation course with respect to OTA production. The presence of dry cherries, which go through the pulper due to their small size, present a different scenario. If we assume a greater development of OTA-producers could have occurred under the extended period of oxidative and mesohydric conditions of this material, the fermentation would not protect and significant OTA production could occur if not during the fermentation, then later during drying.
There are three classes of Pectolytic enzymes. Plants and fungi produce pectin esterases which remove methoxy groups of the uronic acids revealing carboxylic groups through which Ca+2 coordinates the chains. Certain fungi also can produce Pectin lyase, an enzyme that attacks the 1,4 glycosidic links of fully esterified (methoxylated) chains. Lastly, Polygalacturonase is produced by certain bacteria and it also attacks the glycosidic links but only of partially de-esterified chains or segments. The oxidative yeast Cryptococcus is common in the fruit and it is reported to be pectolytic but numerous isolates from coffee have been checked without a positive result. A few Candida species are also reported to liquefy Ca- pectate.
The role of microorganisms in taste defects of wet processed coffee is a matter of debate. Of the numerous defects often attributed to problems during fermentation, the three most serious are ‘fermented taste’, ‘sour’ and stinkers. But because fermentation can occur in the intact fruit, especially if harvested and not processed expeditiously, the same defects can arise in natural coffee and, by extension, in wet processed coffee where the fault was actually elsewhere than the fermentation step.
A fermented taste has fruity aldehyde tones; sour is likened to onion; stinker is a powerful foul taste, and a single stinker bean can effect several kilograms of product. Stinker beans have been attributed to the growth of Bacillus brevis or high levels of lactic acid bacteria and maybe fairly specifically associated with derivatives of methyl-butanoic acid, cyclohexanoic acid esters and S-containing organic compounds. Some compounds that can be traced to a defect also indicate the source where few organisms produce the compound. Earthy and mouldy odour can be attributed principally to 2-methyl-isoborneol and geosmin, respectively. These compounds are produced notably by species of Eurotium, a few other moulds and some actinomycetes.
Soaking:
In some processing chains, whether or not fermentation has been conducted, a soaking step is sometimes applied. This is sometimes called secondary fermentation where a fermentation step is included in the process or fermentation where mechanical mucilage removal has been used. After mucilage removal the parchments are held under water for a period from overnight up to, rarely, 48h. The principle effect is to cause the beans to become more uniformly dark blue- green, a desirable physical character that itself has no taste implication. The colour is the same as that generated by the hydrated bean in response to physical injury, say damage by a coffee berry borer or cutting with a scalpel. The colour is likely to be a hydrolysis reaction akin to the chlorogenic acid reaction – it is not chlorophyll production.
Some authorities claim that soaking removes or reduces any harsh ‘edge’ the cup may have but, if true, it is unclear whether this is due to leaching (some slight leaching has been reported), or the metabolism of the seeds in essentially anoxic conditions. For coffee without this ‘edge’ there is no change in cup quality for up to 7 days, according to one study. The harshness is usually attributed to phenolic compounds so the implication would be that, through one mechanism or another, certain phenolic compounds are removed or altered.
After washing of the parchments, considerable yeast and bacteria remain on the surface and, with the yeasts, even in the bean tissue. However, there is very little substrate for microbial growth so metabolically, this period under water, is quiescent. Short periods of soaking do not seem to be associated with flavour defects outside of the use of tainted water for the soaking.
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]]>There are many factors that make coffee valuable to consumers and one of them is shade effect of growing on coffee quality. Shade matters to some from an environmental perspective; others because they feel it influences the flavor. What I actually know about these important issues is :
The good news is, much research has been done on the ecological and economic impacts of shade-grown coffee. Sadly, there is far less information available on how this influences cup quality. When we hear the term “shade-grown” coffee we many imagine a pristine ecosystem where coffee just happens to be planted and coffee farmer happen to be walking around in the woods picking the beautifully ripe coffee they stumble upon. This romantic vision is rare in the coffee industry. There are, however, varying definitions and variations of forested coffee and agroforestry to consider when thinking of purchasing or promoting such a coffee.
Trees and agroforestry can provide environmental advantages to the planet, and simultaneously in coffee production. Trees act as carbon sinks in the landscape, make oxygen, save water, and provide a myriad of other benefits to the local microclimate and ecosystem. Trees provide the ecosystem with structural and chemical resources. Their roots help prevent erosion. They offer the soil much-needed nutrients from their fallen litter, and certain species can fix nitrogen from the air.
Trees act as buffers to the coffee microclimate. That means that they can act as insulators for the understory, where coffee grows. They can both protect coffee from frost as well as cool the microclimate during very warm weather. Another large way that trees regulate microclimate conditions is through holding moisture in the ecosystem, leaving more water in the soil and therefore theoretically available to coffee plants. There is also evidence that tree cover reduces the leaching of nitrogen from the coffee.
There is a large body of literature supporting the idea that when shade is added to a coffee-growing system, the biodiversity of the ecosystem increases. Here we should stop, and remember that biodiversity is an important intrinsic value. It is a choice to recognize and care about biodiversity. While many of us hold this value, the challenge is to quantify the value of it. How much “better” is a coffee that is produced in a highly diverse environment? Our community faces this challenge daily.
What about flavor: can we taste shade-grown coffee?How does it impact the coffee quality? The answer varies depending on the individual situation. What we do know is that generally, the smaller coffee yield under shading leads to fewer, larger coffee fruits. Also, there is evidence that shade-grown coffee seeds have higher sugar and lipid contents than sun-grown coffee, which may increase the cup quality of coffees. Multiple studies have found that the acidity and body of brewed low-altitude coffee was improved by shading. They suggested that a lower growing temperature (provided by shade) produced a more uniform ripening of berries, which led a better quality cup. However, there are also conflicting studies that have found no perceivable difference in quality. What is the problem here? In the end, unless we understand the biochemistry of fruit ripening time and how this directly affects the chemical composition of coffee seeds and link this to repeatable and consistent flavor differences, it is impossible to say with certainty what is going on. That’s right folks—here is another example of why we reach this same conclusion again and again: more research is needed to help fully understand why coffee tastes the way it does!
Unfortunately, there can also be true drawbacks to shade-grown coffee. In many situations, shade lowers coffee yield, delays ripening, and is more labor-intensive to harvest. These are luxuries that not all producers, as people who must balance costs and benefits, can choose. Any value or perception thereof must make business sense. Fortunately, some farms that use agroforestry can benefit from pricing incentives offered by certification programs. However, the reality is, that the value of shade coffee is not always translated into farmer benefit.
How does it impact the coffee quality?
Where does this leave us? Certainly, flavor alone is not an indicator of whether or not a coffee was shade-grown. Great-tasting specialty coffee can be produced using many/any/all/unknown production strategies. There are real ecological benefits of shade-growing coffee, and there may be quality benefits too. However, if we seek to support this method of coffee growing, we must recognize and value it for its own sake.
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Coffee from Al-Mokha began to be referred to simply as Mocha coffee, a name originally having little to do with the chocolatey coffee drink you can buy today. (Mocha is also used to refer to a coffee varietyoriginating from Yemen, one that the SCA describes as “genetically very close to Bourbon.”)
Yemen coffee has a distinct flavor and aroma. It’s complex earthiness often holds tones of dried fruit, partly due to being dried with the fruit husk. This Arabian Yemen coffee also carries notes of chocolate, cinnamon, cardamom or tobacco. The strongest of these notes is chocolate, which might account for the modern use of the word “Mocha” in association with Yemen coffee.
How It’ Grown ?
Yemen coffee farms are typically small and on the wilder side, with farmers hand-picking the coffee cherries from ancient varieties of Arabica plants growing on gorgeous, terraced mountainsides. The microclimate has produced drought-resistant coffee plantsthat create very unique, complex-tasting coffee beans with that iconic chocolate flavor The coffee is typically harvested between November and December and is sun-dried, often right on the rooftops of the farmers’ houses! It’s an easy process in the bright and hot Yemeni climate. The leftover cherry husks are also used to create qishr(the local brand of cascara)
Sanani Coffee
First, we have the Sanani variety, which comes from various coffee plants grown in the regions west of the capital city of Sana’a. This region tends to include some crops grown at lower altitudes, and can, therefore, be of lower quality. Beans from this region have a balanced and fruity flavor profile, a medium body, and typically exhibit less acidity than other Yemeni coffees.
Hirazi Coffee
Hirazi coffee also comes from the western regions of the nation, located a couple mountain ranges west of the capital of Sana’a. This coffee tends to be light and fruity, with a winey acidity.
Ismaili Coffee
One of the few categorized ancient coffee tree varieties of Yemen, Ismaili is the name of a coffee plant varietal. Typically grown in central Yemen, it yields a unique, high-quality, pea-like coffee bean that tends to be bright and berryish, though this brightness can be muted. This tree/region name overlap can lead to some confusion regarding whether a particular coffee with this name comes from the region itself, or from a tree of that variety
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]]>Controlling variables during roasting process
Coffee roasting includes adjusting many variables to create your perfect roast profile. By changing factors including temperature, length of roast, and airflow, you can highlight sweetness, emphasize acidity, or create a well-balanced roast. also drum speed, you can affect the amount of time that coffee beans are exposed to direct heat.Now you can change all those variable, Should you roast a Colombian Nariño the same way you would an Ethiopian Sidamo? Probably not.Producing countries have different climates, soil types, altitudes, density, moisture, – and all that leads to very different coffees. The beans will react differently to heat, plus you will want to accentuate specific characteristics. In other words, you need to roast them differently.So before you create a profile and put your coffee in the roaster, you need as much information as possible about the beans. And today, I’m going to take you through some of the main origin-based variables to consider. At each stage of the coffee supply chain, the moisture content of a green bean must diminish – or the bean might become moldy, defective, and less valuable than before. Ensuring a bean dries correctly is essential in order to optimize its quality potential and minimize the chance of problems.Roasters, near the end of the supply chain, have two tasks when it comes to managing moisture content. On the one hand, they must maintain the lots they store onsite within a narrow moisture range that is acceptable to their quality standards.
On the other hand, and in the span of a few minutes, the roaster is responsible for driving the last remaining bits of moisture out of the bean via the application of intense heat and pressure. In these minutes, the coffee is exposed to the most energy it will experience at any point in the coffee supply chain and the roast is set up for either success or failure.It’s easy to see why roasters should care about the moisture content of their coffee. But how useful is a number supplied by an importer, and how can roasters integrate moisture content readings into their craft? I spoke with Fred Seeber of Shore Measuring Systems, a supplier of moisture content meters, about measuring and making sense of moisture content in green coffee.
There is no official standard for ideal moisture content in green coffee, although the ICO recommends 11% as a good target. However, it’s commonly accepted that 10-12% is a reasonable range. Anything less than 10% is likely to result in loss of cup quality, while humidity at higher levels begins to create a risk of mold growth. Yet a coffee’s humidity is not static. While the pre-export drying process drastically increases a bean’s stability, changes in moisture content are still possible. Environmental factors, such as being in a particularly humid or hot location, are a common cause of this. Before getting into the technical details of measuring moisture content, it’s worth digging a little deeper into why it’s worth measuring moisture content. Knowing this will help you establish protocols suited to your specific needs.
For roasters of a certain scale, it’s simple: you pay for coffee by weight; the more water in that coffee, the more you’ve paid for water which you’re going to burn off anyway. common situation roasters find themselves in: “So, [an importer] sends you a sample, and… it’s showing 11.5% moisture in that sample. Then when your container shows up, that’s 40,000 pounds, and all of the sudden you discover it could be 13% moisture. Well, you just got blanked for two percentage points of water of a commodity that’s four bucks a pound… that’s [a lot] of money.” For the smaller, quality-focused roaster, those kinds of calculations may or may not be relevant. But moisture content still plays an indirect role in a roaster’s costs, regardless of whether or not they’re buying a few containers or a few bags.
There is no direct link between a coffee’s quality and its moisture content. A 10% humidity coffee is not necessarily better or worse than a 12% coffee. However, over time, green coffee will gradually lose vibrance. This will eventually result in the dreaded “past crop” flavor, and this process is associated with the drying out of the coffee. Therefore, even for a small roaster, it’s important to keep track of moisture content. If you paid for an 85-point coffee at 12% moisture, by the time it reaches 10% moisture it may be more like an 83-point coffee. Yet, you still paid 85-point prices for it originally.
By comparing moisture content loss with quality degradation over time, you can make smart buying and consumption decisions with your green lots. And, when combined with water activity measurements, you can even predict the shelf life of your green coffee. Again, precision here is key: you want to track your coffee through a narrow range of percentage points over a long time frame. Lastly, you may think to yourself that you don’t need to measure moisture content yourself, since your importer supplies those numbers already. Fred cautions against this thinking. He points out that coffee is shipped on water and that ports can often be warm and humid, which will affect moisture readings. So, if you’re a roaster in a dry part of the United States but your importer is located in New Orleans or Houston, and is taking moisture readings from lots right as they arrive, those numbers might not be applicable to you by the time your coffee arrives at your facility. Elevation, or altitude, is of immense importance for coffee roasting – but what we’re really talking about is density. When coffee is grown at cooler temperatures (which, most of the time, means higher elevation), the cherries ripen slower and so develop more sugars. This leads to more complex sweetness, but also to harder, denser beans. When you have beans of different densities, they also react differently to the heat. Soft, low-density beans tend to have more air pockets inside them, which can slow down heat transference. To avoid scorching the outsides of the beans, you should use a lower initial charge temperature. We also recommends extending the length of the roast for these coffees. Knowing what altitude your coffee is grown at, how far it is from the equator, and the temperature on the farm will help you to anticipate the density. When roasting, it’s important to consider not just the structure of the bean, but also the flavor of it. And this can vary greatly. “We will never have an Ethiopian with the same type of acidity like that Kenya AA Kamwangi we once had,” Tom tells me, “and it will be very difficult to find a Colombia with the stone fruit, tea-like flavors of the Yirgacheffe coffees.”
you can expect well-balanced coffees from the Americas, with more chocolate and hazelnut notes appearing in Brazil. In East Africa, coffees tend to be clean, juicy, and fruity. Some regions lean more towards sweetness (like Burundi), while others are more acidic (like Kenya). Indonesia is often known for its heavy body and earthy tones. Yet there are so many flavor variations within one region, as a result of micro climates, terroir, varieties, production and processing methods, and more. Sulawesi, Indonesia is famous for its spice notes, while Bali has a more citric profile. A Panamanian Geisha will taste different from a Panamanian Bourbon. Brazil is so large, you can fit much of Europe in it – and it has a wide variety of profiles to match. And as Tom points out, some countries have multiple harvest seasons. it’s the roaster’s job to preserve what makes an origin special and “let the coffee speak”. Knowing the profile of the coffee origin will help you anticipate which flavors will be most prominent – and how you can emphasize them. roast graph data into two types of curves: control curves and reading curves. Control curves are variables that you directly control during the roast, such as the heat settings, airflow, and gas flow. Reading curves are temperature readings. Since the variables are constantly changing, they are recorded as line graphs.
But what reading curves do you need to know? the key ones are bean temperature, air/environment temperature, and rate of rise curves – although you can also measure bean color, air, and gas pressure for even greater insights. Denser, higher-altitude coffees are associated with greater acidity, and you’ll often hear this described in terms of fruit notes – mandarin, grapefruit, plum, blueberry, and so on. This is a highly prized trait, and if you’re roasting a coffee that has this quality, you may want to accentuate it. (Bear in mind, however, that while acidity can be good, underdeveloped and sour notes are not. There is a fine line.) the more acidity and fruitiness you will throw away. A faster Rate of Rise (RoR) is also recommended by many roasters for emphasizing acidity. On the other hand, if you want more sweetness – say you have a natural Bourbon from Burundi – then Willem Boot, CEO of Boot Coffee, recommends opting for a lower RoR. Sweet Maria’s also experimented with stretching out the drying phase of the roast, and found that it could highlight this quality. as for body, stretching out first crack could open up a more syrupy mouthfeel in a coffee. It’s important to remember that the qualities you want to highlight will all depend on the coffee itself, and its unique, overall profile. Roasting is a complex skill; there are no simple rules. These guidelines are just starting points for creating your roast profiles. Knowing the altitude, temperature, terroir, and origin profile is a great start to creating a roast profile for a coffee. “It’s about a commitment to get to know the origin and bring the best to the surface,”
But it’s only a start.
Bean temperature(the blue line)
The bean temperature curve will look a bit like a check mark; once it starts going up (something called the turning point – more on that to come!) it should always continue going up. If not, you risk stalling your coffee and developing bread-like, doughy flavours
ROR(other blue line which is vice vers)
The rate of rise curve is linked to bean temperature, but there’s a subtle difference: it measures the rate at which bean temperature changes. This will give you far earlier indications of temperature changes and, in turn, allow you more control over the roast. It has a very different shape to the bean temperature curve, rising sharply from zero shortly after the turning point.
Air temperature(RED line)
Air temperature is variable measures the environment inside the drum. It’s useful to know because much of the heat transfer in coffee roasting is via air. This line will follow a similar shape to the bean temperature curve.
Key Stages on Your Roast Graph
Now we know what the roast graph measures, you can start reading and interpreting these lines. To do so, you want to pay attention to several key points on the graph: charge temp, turning point, first crack, and end temp.
Charge Temperature
This is the temperature of your drum just before you add the coffee. By manipulating this, you can speed up or slow down the rate of rise and, in turn, choose how much acidity to accentuate. You should also pay attention to bean density and processing method when selecting this.
Turning Point
As you add the cold beans to the roaster, the heat inside the machine will dramatically fall before starting to rise again. The point at which it begins to rise is called turning point.
First Crack
One of coffee roasting most famous moments is first crack. First crack signals that the beans are almost ready. As the beans expand and moisture evaporates, steam develops inside the beans. This steam then forms pressure that cracks the beans open.
First crack it’s a moment that has been given almost mythical status in coffee roasting – and it deserves it. A key stage in any roast, understanding it will give you insight into how flavors and aromas are developing.
End Temperature
As the name suggests, this is the temperature at the end of your roast.
By understanding what’s going on inside the roaster at these key points, you’ll be able to start evaluating the impact of them on your beans. For example, by manipulating charge temp you can speed up or slow down your roast. The duration of first crack can affect body. Roasting graphs may, at first, be challenging. There’s a lot of data to collect and understand. However, as you start to work with air temperature, rate of rise, first crack, and more, you will begin to gain real mastery over how your coffee beans develop during roasting. So don’t be intimidated by these charts – start recording those temperatures and see how it helps you as a roaster. As heat is applied to the coffee beans, they go through endothermic and exothermic reactions. Up until first crack, the beans absorb the heat (an endothermic reaction). The moisture dissipates and the color changes from green to yellow and then brown. The aroma will be cereal-like: think toast, popcorn, or grass. As for first crack, this is a brief exothermic reaction: the beans release heat (energy) in the form of that steam we mentioned above, along with carbon dioxide. The bean will have doubled in size and shed the majority of their silver skin, but oils won’t yet be present. After first crack, it switches back to an endothermic reaction until second crack, the final exothermic reaction (if you choose to roast your beans that far).
Flavor Development
Although we like to talk about first and second crack when roasting coffee, it’s important to remember that coffee flavor profiles are the real goal. And for this reason, we also need to consider caramelization and the Maillard reaction. Both of these happen before first crack. The Maillard reaction occurs when we start to see browning, and it creates many of the flavors in our coffee – especially the savory ones. As for caramelization, it happens a little after the Maillard reaction it as the dehydration of sugars through heating, which then give off the carbon dioxide and H2O that cause first crack. As you may have guessed, this process leads to caramel flavors in the roast – but it’s also what causes bitter notes if the heat continues for too long. It’s hard to predict exactly when these reactions will take place. Joe tells me that they occur as a result of the amino acids and sugar molecules, and as these break down, hundreds of reactions occur. These reactions start at different temperatures, but, due to different coffee structures hitting these different temperatures at different times in the drum, they can overlap. Since it’s so difficult to anticipate these reactions, it’s even more important to pay attention to the aroma and color of the beans.
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]]>Coffee trees are pruned short to conserve their energy and aid in harvesting, but can grow to more than 30 feet (9 meters) high. Each tree is covered with green, waxy leaves growing opposite each other in pairs. Coffee cherries grow along the branches. Because it grows in a continuous cycle, it’s not unusual to see flowers, green fruit and ripe fruit simultaneously on a single tree. It takes nearly a year for a cherry to mature after first flowering, and about 5 years of growth to reach full fruit production. While coffee plants can live up to 100 years, they are generally the most productive between the ages of 7 and 20. Proper care can maintain and even increase their output over the years, depending on the variety. The average coffee tree produces 10 pounds of coffee cherry per year, or 2 pounds of green beans. All commercially grown coffee is from a region of the world called the Coffee Belt. The trees grow best in rich soil, with mild temperatures, frequent rain and shaded sun.
Botanical classification
Coffee traces its origin to a genus of plants known as Coffea. Within the genus there are over 500 genera and 6,000 species of tropical trees and shrubs. Experts estimate that there are anywhere from 25 to 100 species of coffee plants. The genus was first described in the 18th century by the Swedish botanist. Botanists have disagreed ever since on the exact classification, since coffee plants can range widely. They can be small shrubs to tall trees, with leaves from one to 16 inches in size, and in colors from purple or yellow to the predominant dark green.
In the commercial coffee industry, there are two important coffee species — Arabica and Robusta.
Coffea Arabica — C. Arabica
Varieties: Bourbon, Typica, Caturra, Mundo Novo, Tico, San Ramon, Jamaican Blue Mountain
Coffea Arabica is descended from the original coffee trees discovered in Ethiopia. These trees produce a fine, mild, aromatic coffee and represent approximately 70% of the world’s coffee production. The beans are flatter and more elongated than Robusta and lower in caffeine.
On the world market, Arabica coffees bring the highest prices. The better Arabicas are high grown coffees — generally grown between 2,000 to 6,000 feet (610 to 1830 meters) above sea level — though optimal altitude varies with proximity to the equator. The most important factor is that temperatures must remain mild, ideally between 59 – 75 degrees Fahrenheit, with about 60 inches of rainfall a year. The trees are hearty, but a heavy frost will kill them. Arabica trees are costly to cultivate because the ideal terrain tends to be steep and access is difficult. Also, because the trees are more disease-prone than Robusta, they require additional care and attention.
Coffea canephora — C. canephora var. Robusta
Variety: Robusta is a one canphora variety
Most of the world’s Robusta is grown in Central and Western Africa, parts of Southeast Asia, including Indonesia and Vietnam, and in Brazil. Production of Robusta is increasing, though it accounts for only about 30% of the world market. Robusta is primarily used in blends and for instant coffees. The Robusta bean itself tends to be slightly rounder and smaller than an Arabica bean. The Robusta tree is heartier and more resistant to disease and parasites, which makes it easier and cheaper to cultivate. It also has the advantage of being able to withstand warmer climates, preferring constant temperatures between 75 and 85 degrees Fahrenheit, which enables it to grow at far lower altitudes than Arabica. It requires about 60 inches of rainfall a year, and cannot withstand frost. Compared with Arabica, Robusta beans produce a coffee which has a distinctive taste and about 50-60% more caffeine.
The Anatomy of a Coffee Cherry
The beans you brew are actually the processed and roasted seeds from a fruit, which is called a coffee cherry. The coffee cherry’s outer skin is called the exocarp. Beneath it is the mesocarp, a thin layer of pulp, followed by a slimy layer called the parenchyma. The beans themselves are covered in a paper-like envelope named the endocarp, more commonly referred to as the parchment. Inside the parchment, side-by-side, lie two beans, each covered separately by yet another thin membrane. The biological name for this seed skin is the spermoderm, but it is generally referred to in the coffee trade as the silver skin.
In about 5% of the world’s coffee, there is only one bean inside the cherry. This is called a peaberry (or a caracol, or “snail” in Spanish), and it is a natural mutation. Some people believe that peaberries are actually sweeter and more flavorful than standard beans, so they are sometimes manually sorted out for special sale.
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The beans we roast, grind, and brew to make coffee are the seeds of a fruit. The coffee plant produces coffee cherries, and the beans are the seeds inside. Coffee trees can naturally grow to over 30 ft/9 m. But producers prune and stump plants short to conserve the plants’ energy and to help harvesting. Smaller trees have better yield and quality in a limited space. Each tree is covered with green, waxy leaves that grow in pairs and coffee cherries grow along its branches. Depending on the variety, it takes three to four years for a coffee plant to produce fruit. The National Coffee Association USA states that the average coffee tree produces 10 lbs. of coffee cherry per year, which results in around 2 lbs of green beans. But there are different varieties of coffee and their beans have many different characteristics. Size, flavor, and disease resistance vary, among other factors. beans, which are the unroasted seeds from inside the ripe coffee cherry. Beneath the cherry skin is a thin layer called the mesocarp, more commonly known as the pulp. Mucilage is the inner layer of the pulp. There’s also a layer of pectin underneath the mucilage. These layers are full of sugars, which are important during the fermentation process. Then we reach the coffee seeds, which are technically called the endosperm but that we know better as beans. There are usually two beans in a coffee cherry, each of which is covered by a thin epidermis known as the silver skin and a papery hull that we call parchment (technically the endocarp). The parchment is usually removed in hulling, which is the first step in the dry milling process. Machines or millstones are used to remove any remaining fruit and the dried parchment from the beans. But sometimes green beans are sold with this layer intact as parchment coffee. The silver skin is a group of sclerenchyma cells that are strongly attached to the beans. These cells form to support and protect the seed. They come off during roasting, when they are known as chaff.
A coffee cherry’s skin is called the exocarp. It is green until it ripens to a bright red, yellow, orange, or even pink, depending on variety. Green coffee cherries shouldn’t be confused with green coffee.
Sometimes there is just one seed inside a coffee cherry and it is rounder and larger that usual. This happens in about 5% of coffee cherries and the beans are known as peaberries. Peaberries can be an anatomical variation of the plant or they can form when there is insufficient pollination and one ovule isn’t fertilized. Sometimes the seed simply fails to grow, whether due to genetic causes or environmental conditions. Peaberries usually occur in the parts of the coffee plant that are exposed to severe weather conditions. There is some debate over whether peaberries have a sweeter and more desirable flavor and they are sometimes sold at a premium. Regardless of whether you think they taste different, their rounded shape allows for better rolling in the roasting drum. So it’s best to keep them apart from other beans to avoid an inconsistent roast. Coffee cherry skin and fruit is usually discarded, but sometimes they are dried to make cascara for tea and other products. It is difficult to remove skin and mucilage from coffee beans and different processing methods have developed to do so. Each method has an effect on the flavor and profile of the final coffee. For example, washed coffee has all of the fruit flesh removed before drying. But in natural coffee the fruit flesh is removed after drying. In honey and pulped natural processing, the skin and sometimes part of the mucilage is removed before drying but the remaining mucilage and other layers are removed after. Leaving the mucilage on results in sweeter coffee with more body. It’s easier to understand why if we compare both dry and wet post-harvest processes. When coffee cherries are taken from the branch, they start to germinate. This uses the sugar in the seed. Germination stops when drying begins. Natural processed coffees go to the drying terrace earlier than pulped naturals or washed coffees. Because of this, more sugars remain in the naturals and you end up with a sweeter bean. Washed coffees have clean, more consistent flavors that can show off a lot of acidity. Natural coffees have a lot more fruitiness, sweetness, and body. The sugars of the mucilage also ferment during both dry and wet processing, and this has an impact on the final flavor. Without careful monitoring and consistent drying, the unpredictable process of fermentation can undesirable qualities. Understanding the basics of the coffee cherry can help you better understand production, processing, and roasting. Next time you are choosing between a natural processed and washed coffee, you can have more confidence in knowing what that means and its impact on your cup.
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]]>Finding the good green coffee in any field (specialty or non) is always my concern and also I had problem always for finding what I need but the answer is so simple , I didn’t know what I need , first decided about price, cup profile and target market, then start sending email to all the coffee importers and take their price list and find what you like.
Purchasing coffee is no easy task – although it’s certainly an exciting one. From selecting your origins to managing inventory, there are endless considerations. But your green coffee importer doesn’t just have to be your supplier. They could also be an important resource as you brand yourself and grow as a business. How do you build your partnership with a green coffee importer? What questions should you be asking them? And what do they need to know about you? This is other point of view.
The cuping way is so important. Cupping: it’s how you decide if a coffee is worth adding to your profile and it’s how the importer determines its cupping score, flavor notes, and ultimately, price. However, not everyone cups in the same way. “It is important to rule out any variable that makes the experience of tasting coffee different from importer versus customers. So, it’s a good idea to understand how your importer is cupping in order to replicate that yourself and to get an idea of what they are tasting under the same conditions,” says Caitlin. Additionally, you should ask about the kind of cupping feedback the importer provides. Will you just get a number or do you receive more information about the coffee? “Not every coffee is going to be a 90+ Geisha, but that doesn’t mean that the coffee is not a really good representative of a certain region or a certain profile. So, what we try to do when we communicate with our clients is go a little past the number score and more about what may be the use for this coffee. Is it going to be a pour over or is it going to be a piece of a blend?”
Servicing Provide is really important for keeping the quality, Don’t make assumptions: a lot of importers will do more than just sell you their coffee. Find out about the scope of services that they offer. Do they provide logistical support? Are freight costs included? Do they have a warehouse facility where you can store your coffees and, if so, for how long? Do they offer financing options? “It’s an absolutely important question, For Royal, for example, if customers pay up front for their coffee, we offer five months of free storage in the warehouse. Some of these options may be included in the pricing while some might be extra. Make sure you understand exactly what everything costs – and how that might vary as your purchases change in the future. you can also offer financing options that will depend on the pricing of coffee and the nature of the account. These services can potentially save you money and help you have better cash flow, so it’s good to understand exactly what you get”. Other issue is about asking the right questions (and at the right time).
As a roaster, your business identity – and your customer’s loyalty – will often revolve around which kinds of coffee you provide. You don’t want to lose customers who love your coffee’s flavor, only because can’t provide them with a suitable replacement when it goes out of season. So, ask your importer about seasonality and coffee substitutions. What are some origins that you can purchase all year round, and what are their unique characteristics? How should you organize your purchases from your favorite origin, depending on the seasonality? When you start to run out of a particular component coffee for a blend, can they offer you a suitable substitute? I recommend asking these questions in the planning stage of your roastery, even before your roastery is open. If you tell an importer that you’re “looking to open a roaster in six months or eight months,” he tells me, they can recommend origins that are going to be in season in that period. They can also walk you through the timeline of how and when to start purchasing coffee. Another thing that you can ask your importer is how they source. Do they buy from single farms, cooperatives, or both? What kind of impact will your purchasing decision have in the coffee-farming communities? You can ask these questions is vital for building your brand identity and mission, especially if ethically sourced coffees and sustainability feature in that. Yet it’s not always as simple as single origins are better. He says that while a single farm may offer traceability, buying from cooperatives could help hundreds of community members. He recommends having a conversation with your importer to gain a bigger picture of the effect of your purchasing decision.your Purchasing Options & The Receiving Process is about If you know the kind of coffee you want to buy and the origin, how should you move forward? Is spot purchasing an option? What about forward contracts? Is it possible to benefit through your importer trading in futures contracts?
This is an important question,particularly for roasters that are starting out.while various importers offer different buying options, the one you should pick will depend on your roastery and its size. if you’re just starting out, he explains,you can start spot purchases from a warehouse at that time and, as you grow, you might say, ‘I want to do forward contracts.’… That can be beneficial to having a more long-term sense of what your cost may be for a coffee, but keeping in mind that your cash flow and working capital are very important as you grow then nnce you have decided on the coffee and the contract, you should ask your importer about the receiving process. Check the available freight options, as well as how long it will take from the moment you place an order until you receive it. Knowing this will make inventory management easier. Now you can ask importers for the realistic time from the date of order to delivery to your door, and then “backtrack when you need to place the order, and add a few more days to that, just to be sure. additionally, roasters can treat importers as a source of knowledge. Think about us as a resource not just for the green bean itself, but sometimes to give you a picture of any other aspect of the market that may affect the transit time for origins and may affect pricing for certain origins, whether it’s port strikes, currency movements, or unexpected weather, importers keep close tabs on anything that could affect the coffee trade. As a result, they can be a valuable aid when you’re trying to plan ahead. No-one knows more about these coffees than the importer themselves.Finally find out what services they offer. Ask them about these basics and figure out what you need. And make sure they also know a bit about you.
This will help you to select the right green bean supplier and then build a strong relationship with them, one that will support you in making the best purchasing decisions, managing your cash flow, and reinforcing your brand. For traders, it’s their job to sell coffee, But at the same time, I want to have anyone that I work with and their business to succeed.
Saeed abdinasab
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]]>About the environmental factors that affect coffee flavor and sustainability. It’s important how the terroir determines have effect on the character of a coffee and the success of a crop. Among all the environmental factors that could affect a coffee plant in its lifetime, some, such as altitude, are impossible to alter. Others, such as soil nutrition and shade cover, can be altered, but this often requires vast capital expenditure. Our goal is to give baristas and coffee lovers a clearer picture of how certain aspects of terroir can affect a plant’s health and the success of a coffee farm. In this topic, we look a broad range of our experience and long research on the books.
Phenotype vs. Genotype
Nomenclature
Terroir is The character of the land and the farming environment. Environmental factors such as altitude, latitude, climate, soil condition, and farming practices affect a crop’s phenotype.
Phenotype The observable characteristics of an organism in a given terroir, resulting from the interaction of an organism’s genotype (genetic code) and the terroir.
Genotype The chemical composition of DNA that gives rise to a particular phenotype; the genetic code for a particular trait.
Great coffee is the result of a plant’s genotype and the terroir that surrounds it. The environmental factors of climate, soil, and farming techniques combine to create the terroir of a coffee farm. This topic explores how the terroir determines the character of a coffee and the success of a crop. Among all the environmental factors that could affect a coffee plant in its lifetime, some, such as altitude, are impossible to alter. Others, such as soil nutrition, can be altered, but only with vast capital expenditure. To get a clearer picture of how expensive farm management can be and how certain aspects of terroir can affect a plant’s phenotype, we conducted a broad range of interviews with scientists, agronomists and green buyers.
This course provides an overview of what factors you can control and how it can be done to produce a sustainable crop and a great tasting cup.
Origin – In the cloud forests of Kaffa, in southwest Ethiopia, Coffea arabica grows as an understory plant. Local tradition stipulates where the coffee can be gathered in the forests and who can harvest it. Coffee plants that grow in this type of heavily shaded terroir have a far lower yield than those grown in full sun on most of the intensively farmed large Brazilian plantations.
Many botanists consider southwest Ethiopia to be the birthplace of Arabica coffee, but the debate about its precise origin is not settled. In Southern Sudan, for example, a bit farther down the plateau, wild arabica ignores human-made borders.
The original terroir of coffee, in the ancient forests on the Boma plateau of Ethiopia and South Sudan, was quite different from that of the Arabian peninsula and the Port of Mocca, from where the global coffee trade first emerged in the sixteenth century. In the opinion of coffee’s leading taxonomist, Aaron Davies of Kew Gardens, it was two-way traffic for coffee across the Red Sea (Jeff Koehler, 2016). Coffee arrived in Yemen and, over time, genetic strains adapted to Yemen’s dryer terroir and poor soil. Eventually, these varieties returned to Ethiopia with certain improvements.
The Taxonomy of C. Arabica – Why isn’t it Called C.Aethiopica?
In 1753, Carl Linnaeus, the originator of plant taxonomy, “unintentionally hijacked Ethiopia’s proprietorship of coffee,” according to writer-researcher Jeff Koehler. Linnaeus had already arrived at the name Coffea (C.), using his new system of classifying plants. In his definitive work Species Plantarum, he added the word arabica (from Arabia) to the passage about coffee. Koehler explains –
A decade or so later he published Potus Coffea, an eighteen-page pamphlet made of rag scrap with words running to the edges, adding that the plant grew spontaneously in “Arabic felici and Aethiopia”. It was too late. He had named it Coffea arabica, not Coffea aethiopica, and Arabia would continue to be regarded in the public mind as the original source of coffee.
Even the earliest-known writing on the subject of coffee, a treatise by Abd al-Qadir al-Jaziri called The Best Defense for the Legitimacy of Coffee, first published in 1558, regarded the origins of coffee to be in Arabia. It wasn’t until Scottish explorer James Bruce ventured into Kaffa in 1769 that Europeans had any evidence as to the origins of arabica coffee. Bruce’s message is reported to have been considered too wondrous to be true, however, and it was widely ignored.
Present-Day Production Methods
Global coffee production worldwide is largely in the hands of smallholder farmers, totaling an estimated 100 million coffee farmers. (F. E. Vega et al., 2003) This means the livelihood-value of coffee farming is immense. In Ethiopia, about twelve million smallholder farming households account for an estimated 95 percent of agricultural production and 85 percent of all employment. The majority of coffee production is carried out as garden coffee, grown in amongst other crops. Only 5 percent of Ethiopia’s coffee production comes from plantations. (Jeff Koehler, 2016) The third means of production comes from an agroforestry practice known as semi forest, wherein some trees are pruned and some of the forest canopy is thinned in order to manipulate the available sunlight coming to the plants, which increases their yields.
In other parts of the world, such as Brazil, coffee is grown on huge plantations using intensive farming techniques involving a high degree of automation — in particular, mechanical harvesting and sorting. Brazil is the world’s largest coffee producer, accounting for around 40 percent of the world’s arabica coffee production, yet in spite of the increased level of technology, 3.5 million Brazilians depend on coffee for their livelihoods.
not every terroir is suitable for high levels of automation, and as global warming advances, it is expected that the suitable terroir for coffee production will shift to higher altitudes and lower latitudes. This is known as the upslope potential.
- Coffee is the dominant understory plant in most forests, there is a lot of competition for growth from other species.we need to know The Forest coffee production system is one of the popular systems available. This system is known for harboring wild coffee trees. The level of coffee genetic diversity in this system is relatively higher than the level of genetic diversity available in other production systems (semi-forest, garden, and larger private farms). But when we are talking about the level of plant species diversity available in most forests, coffee is not the dominant understory plant.
- There are various understory tree species growing in most of the forests. And the availability of diverse species basically creates strong competition among different species. Densely of spaced do the coffee shrubs tend to be in the forest and The level of coffee management intervention by the local community who live near the forest highly affects coffee tree population density. Where the level of intervention is minimal, coffee trees are found growing densely. However, those parts of the forest areas that are highly accessible by the local communities are characterized by sparsely populated coffee trees.
- coffee plants prefer a particular type of forest canopy and plants perform better in spaces where trees have been pruned, sometimes large trees have fallen and created gaps in the canopy but Coffee is naturally a shade-loving plant. Shade helps coffee trees to have a longer and more productive lifespan, with a consistent production pattern year after year. Thus, the nature of the forest canopy determines the inherent production potential of a given coffee variety. A lot of research has been conducted so far on coffee shade trees. A forest canopy that allows 20 percent of sunshine is supposed to be an ideal shade level for optimum and consistent production patterns. Coffee trees under such a shade level perform better than those trees under a closed canopy or on fully open farms.
- any planting occur in the forest And it’s the way of how they choose the variety is Legally, the local communities who live near the forest are not allowed to bring in and plan their own varieties (coffee or any other plants) in the forest. But in the other production systems like semiforest and garden coffee, farmers or local communities are allowed to do their own plantings.
- the plants that farmers grow as ‘garden coffee’, outside the forest is differ from the plants that grow within the forest because Varieties that grow in gardens and forest production systems have different characters. The main difference is their morphological (physical) appearance. The coffee trees in the forest are aged. If a [forest] tree is young, it is a little bit longer, with [fewer] primary/secondary/tertiary branches. Moreover, the trees in a forest appear less productive. And the reverse is true with garden coffee trees.
- Agroforestry is offer coffee plants more protection from diseases, compared with growing coffee outside the forest because Since coffee is a shade-loving plant, naturally, the level of abiotic/biotic stress will be very severe when the coffee is planted without shade or outside the forest. The level of sunlight received determines the level of leaf-to-crop ratio. Under open farms, the level of crop is very high and that a significant level of imbalance between leaf (food source) and crop (food sink) ratio. This causes overbearing (overproduction) dieback (tree death). Thus, agroforestry is an inevitable option to [ensure] healthy coffee trees and consistent level of production year after year.
- we think makes Ethiopian coffee taste so intensely floral is in their terroir, the genotype(s) and range of factors, like Coffee quality is a very complex trait. It is controlled by genetics (G) (genetic makeup of the coffee tree), environment (E) (altitude, soil, rainfall distribution, and other micro- and macro-climatic factors), and the interaction of both (G x E). Ethiopia is known as a center of origin and genetic diversity. There are a wide range of coffee varieties available in the country, which is one of the reasons behind the intense floral taste. Secondly, the availability of diverse agro-ecology (environment/terrior) interacting with different varieties could create a wide range of flavour notes in Ethiopia. Most Ethiopian coffees are known for their intense floral aftertaste. In particular, coffees from Yirgacheffe, Guji, Sidama, Gera, and Anfilo are known for their floral/ fruity/spice flavours.
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