1. Introduction
Coffee is a perennial crop that grows in tropical and subtropical climates and is a member of the Rubiaceae family
[7] | Berthaud J and A Charrier. Genetic resources of Coffea. pp: 1-42. In: Clarke RJ, Macrae R (eds), Coffee: Agronomy, vol. IV, Elsevier Applied Science, London, 1988. |
[7]
. With the exception of Coffea arabica, which is a typical allotetraploid (2n = 4x = 44) selfpollinating species, almost all coffee species are diploid (2n = 2x = 22) and most are selfincompatible
[7] | Berthaud J and A Charrier. Genetic resources of Coffea. pp: 1-42. In: Clarke RJ, Macrae R (eds), Coffee: Agronomy, vol. IV, Elsevier Applied Science, London, 1988. |
[7]
. There are 124 species of the genus Coffea described to date
[13] | Davis, A., Justin, M., Jenny, W., Susana, B., Timothy, W, Tadesse, W., Zeleke, K., Sebsebe, D.,2017. Effect of climate change on Arabica coffee specie in Ethiopia. |
[13]
. Arabica coffee is one of the most important beverages in the world and an important source of foreign currency for many countries
[28] | Labouisse, J.P., B. Bellachew, S. Kotecha and B. Bertrand, (2008). Current status of coffee (Coffea Arabica L.) genetic resources in Ethiopia: Implications for conservation. Genet. Resour. Crop Evol., 55: 1079-1093. |
[28]
. In the consumer market, Arabica coffee is preferred because it provides a better drink, has a better aroma and contains less caffeine than Robusta coffee. Robusta is characterized by its bitterness and high caffeine content. According to
[30] | Lumbroso O. De l’écolier à l’écrivain: Critique génétique et perspectives innovantes sur l’écriture d’invention. études Paris. 2009 Feb 4; 1. |
[30]
, Arabica coffee accounts for 65% of the world coffee production.
Ethiopia has been considered the country of origin of coffee since the coffee tree was first discovered and planted in the Kaffa region (Ganga, Makira) of Ethiopia. The origin and location of the genetic diversity of Arabica coffee is Ethiopia and the availability of genetic potential for coffee fortification
[21] | Fikadu Tefera., Bayetta Bellachew, Behailu Atero, Ashenafi Ayano and Tadesse Benti, (2008). Germplasm collection and maintenance of coffee (Coffee Arabica L In: Girma A., Bayetta Belachew, Tesfaye Sh, Endale T and Taye K (eds.). Coffee Diversity and Knowledge. Proceedings of a National Workshop Four Decades of Coffee Research and Development in Ethiopia, 14-17 August 2007, Addis Ababa, Ethiopia. |
[21]
. Ethiopia is the origin, cradle and center of evolution and transmission of the coffee plant, as well as the birthplace and breeding ground of Arabica coffee seed biodiversity
[3] | Bayetta, B. 2001.Arabica coffee breeding for yield and resistance to coffee berry disease (Colletotricumkahawahsp.), Doctoral Thesis, Imperial College Wye University, London. |
[3]
. According to
[9] | Central statistical Agency Agricultural sample survey, Addis Ababa, 2017. |
[9]
, Ethiopia's estimated coffee cultivation area is about 700,474.69 hectares, and the country's estimated annual clean coffee production is about 469,091.12 tons, with an average production of 669.6 kg ha1. Ethiopia remains Africa's largest producer of coffee, ranked fifth in the world after Brazil, Vietnam, Colombia and Indonesia, accounting for approximately 4.2% of all coffee produced worldwide
[24] | ITC (2004). Bitter or better future for coffee producers? International Trade Centre.The magazine of the International Trade Centre. 2: 9-13. |
[24]
. Coffee is one of the most traded products on the world market in terms of volume and value
[45] | Zewdu, Y. Explaining the Determinants of Ethiopia” s Coffee Export Performance and Potential. Ethiopian Coffee Exporters‟ Association, 2016. |
[45]
. It is estimated that world coffee production in 2013 was 8.75 million tons and total exports reached 23.4 billion US dollars. Approximately 60 to 70% of the world's coffee is produced in the United States, and Arabica is grown in 85% of coffeeproducing countries
[24] | ITC (2004). Bitter or better future for coffee producers? International Trade Centre.The magazine of the International Trade Centre. 2: 9-13. |
[24]
. More than 100 million people are employed in the coffee industry worldwide
[34] | Pittia, P.; Nicoli, M.C.; Sacchetti, G. (2007).Effect of moisture and water activity on textural properties of raw and roasted coffee beans. J. Texture Stud., 38, 116–134. |
[34]
. Coffee is a global crop, given that coffee provides an important source of income for many farmers
[25] | ITC. Ethiopian Coffee Quality Improvement Project: Aid for Trade Global Review: Case Story. International Trade Center (ITC), Geneva, Switzerland, 2011. |
[25]
.
In
Ethiopia,
coffee
is
grown
in
agroecological
zones
divided
into
different
regions
and
political
zones.
The
southwest
and
southeast
of
Ethiopia
are
the
coffeeproducing
regions
of
the
country,
while
the
central
region
is
in
the
north.
Climate
change
has
been
reported
to
have
a
negative
impact
on
coffee
production
[13] | Davis, A., Justin, M., Jenny, W., Susana, B., Timothy, W, Tadesse, W., Zeleke, K., Sebsebe, D.,2017. Effect of climate change on Arabica coffee specie in Ethiopia. |
[13]
.
Coffee
is
grown
in
a
variety
of
habitats,
including
forests,
semiforests,
gardens
and
plantations.
Different
people
have
different
ideas
about
how
big
a
farm
should
be
for
small
coffee.
More
than
90%
of
the
coffee
grown
in
the
country
is
produced
by
small
farmers
and
10%
by
medium
and
large
growers
[39] | USDA (United States Department of Agriculture). Coffee Production and Exports Remain Steady Report number ET 1615, Ethiopia, 2016. |
[39]
.
The
average
farm
is
less
than
2
hectares
and
accounts
for
most
of
the
production;
however,
the
yield
is
low
at
0.7
to
0.8
tonnes
per
hectare
[39] | USDA (United States Department of Agriculture). Coffee Production and Exports Remain Steady Report number ET 1615, Ethiopia, 2016. |
[39]
.
It
is
reported
that
small
farmers
produce
an
average
of
0.67
hectares.
The
main
problems
include
underdeveloped
local
coffee
varieties
and
cultural
and
labor
practices
that
greatly
affect
the
production
of
the
country's
small
farmers
and
the
country's
total
coffee
production
[38] | Taye Kufa. Environmental Sustainability and Coffee Diversity in Africa, 2010. |
[38]
.
The
Ethiopian
coffee
market
is
based
on
origin
(varietal),
known
for
its
quality
and
agricultural
characteristics.
According
to
[33] | Musebe R, Agwenanda C, Mitiku M. Primary coffee processing in Ethiopia: patterns, constraints and determinants. Afr. Crop Sci. Conference Proceed. 2007: 8: 1417-1421. |
[33]
,
the
first
postharvest
process
accounts
for
40%
of
coffee
quality
decisions,
followed
by
the
second
process,
accounting
for
40%.
But
many
factors
contributed
to
the
decline
of
coffee
cultivation
there.
This
is
mainly
due
to
poor
agricultural
management,
poor
postharvest
management,
lack
of
wet
and
dry
systems
and
inadequate
storage
systems.
Therefore,
the
gaps
created
by
these
problems
may
affect
the
connection
of
the
coffee
trade
between
the
country
and
the
world.
The
main
purpose
of
this
review
is
to
examine
the
variables
affecting
coffee
quality
in
Western
Ethiopia.
1.1. Ethiopian Coffee Production
Ethiopia's main export product is coffee
[34] | Pittia, P.; Nicoli, M.C.; Sacchetti, G. (2007).Effect of moisture and water activity on textural properties of raw and roasted coffee beans. J. Texture Stud., 38, 116–134. |
[34]
. Arabica coffee, produced only in Ethiopia, has a good aroma, mild taste and pleasant acidity and is considered superior to Robusta coffee
[45] | Zewdu, Y. Explaining the Determinants of Ethiopia” s Coffee Export Performance and Potential. Ethiopian Coffee Exporters‟ Association, 2016. |
[45]
. The country is the world's third largest producer of Arabica coffee and produces the best coffee in Africa
[24] | ITC (2004). Bitter or better future for coffee producers? International Trade Centre.The magazine of the International Trade Centre. 2: 9-13. |
[24]
. Twentyfive percent of the Ethiopian population depends directly or indirectly on income from growing coffee
[45] | Zewdu, Y. Explaining the Determinants of Ethiopia” s Coffee Export Performance and Potential. Ethiopian Coffee Exporters‟ Association, 2016. |
[45]
. The coffee industry in Ethiopia is jointly supported by the regional and federal governments
. The country managed to surpass other countries and become the world's largest producer of coffee, mainly due to the quality of its coffee
[22] | Gole, T., (2003). Vegetation of the Yayu Forest in SW Ethiopia: Impacts of human use and implications for in situ conservation of wild Coffea arabica L. populations. Gottingen, Cuvillier Verlag. |
[22]
. According to
[2] | Alemseged Assfa, Getaneh Arega, 2013. Ethiopian Coffee Exporters. |
[2]
, Ethiopian coffee is known for its rich taste and aroma, making it suitable for blending with coffees from other countrie. Changing consumer behavior and increasing demand for quality coffee present opportunities for coffeeproducing countries such as Ethiopia. Increasing coffee exports and achieving better coffee prices can be two benefits of improving coffee quality
[27] | Kassaye, T. Biophysical controls on speciality coffee quality in Jimma zone. Jimma University, and Supporting the development of Commercial Agriculture Programs at four Ethiopian universities (ETH 019), Q-Point The Netherland, 2017. |
[27]
. According to
[23] | Herhaus consultant (2014). Cooperation - EU recommends establishment of Arabica Coffee Research Institute in Ethiopia. |
[23]
, Ethiopia is famous for producing the best Arabica coffee in the world market.
1.2. Coffee's Qualitative
Part of the quality of coffee can be attributed to the plant, soil characteristics, weather conditions, management used throughout the growing season, harvesting, storage, preparation, export and transportation. This includes human involvement, whose motivation is the main factor in the final decision about green coffee. Various actions of producers and the environment can often affect the quality of coffee
[25] | ITC. Ethiopian Coffee Quality Improvement Project: Aid for Trade Global Review: Case Story. International Trade Center (ITC), Geneva, Switzerland, 2011. |
[25]
. According to
[35] | Richard, O. C., Murthi, B. P. S., & Ismail, K. (2007). The impact of racial diversity on intermediate and long-term performance: The moderating role of environmental context. Strategic Management Journal, 28(12), 1213–1233. https://doi.org/10.1002/smj.633 |
[35]
, preharvest practices have a 40% impact on coffee qualit, postharvest practices have a 40% impact, and export marketing has a 20% impact. In recent years, production and export volumes of different coffee countries have increased significantly
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
. Considering the current economy based on overproduction and low prices, improving and evaluating coffee quality can bring new energy to coffee chains
[29] | Leroy, T. Ribeyre, F. Bertrand, B. Charmetant, P. Dufour, M. Montagnon, C. Marraccini, P. and Pot, D. Genetics of coffee quality.Braz. J. Plant Physiol. 2006: 18(1): 229-242. |
[29]
.
Production levels, cost and ease of cultivation among farmers influence coffee quality. At the exporter or importer level, large beans, no defects, consistent supply, tonnage, physical properties and price all make up good coffee. Moisture content at the roasting level, stability properties, date, price, biochemical composition and sensory quality all influence coffee quality
[29] | Leroy, T. Ribeyre, F. Bertrand, B. Charmetant, P. Dufour, M. Montagnon, C. Marraccini, P. and Pot, D. Genetics of coffee quality.Braz. J. Plant Physiol. 2006: 18(1): 229-242. |
[29]
. Producing and supplying the best quality coffee seems more important than ever for coffee exporting countries. Therefore, in various coffee development programs in some countries, it is important to evaluate coffee quality as well as disease resistance and productivity
[24] | ITC (2004). Bitter or better future for coffee producers? International Trade Centre.The magazine of the International Trade Centre. 2: 9-13. |
[24]
. Looking at the current situation, it seems that countries like Ethiopia cannot overcome the problems and threats by increasing production alone. That is why it is often said in many forums that offering good coffee is the only way and real option to enter the world market and still be competitive
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
. Ethiopia's most important export is coffee, which remains the most important crop. Known for producing quality coffee, Ethiopia is the source of Arabica coffee and is also appreciated for its aroma and taste. Sidamo, YirgaChefe, Haerge, Gimbi and Limu coffee varieties stand out with this quality
[43] | Workafes, W.T. and Kassu, K. (2000) Coffee production systems in Ethiopia. Proceedings of the Workshop on the Control of Coffee Berry Disease (CBD) in Ethiopia, Addis Ababa (Ghion Hotel), 13-15 August 1999, 99-106. |
[43]
. However, due to its exceptional quality and proper processing, coffee grown in special regions of Ethiopia, especially Harar and Yirgashev, is always sold at a high price in the domestic and international coffee market
[24] | ITC (2004). Bitter or better future for coffee producers? International Trade Centre.The magazine of the International Trade Centre. 2: 9-13. |
[24]
. However, due to improper processing, sundried Jimma coffee becomes one of the cheapest coffees on the world market, while Limmu washed grade 2 coffee is more expensive, despite being grown in the same agroecological zone
[17] | Desse N (2008). Mapping quality profile of Ethiopian coffee by origin. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14-17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 328-333. |
[17]
.
[17] | Desse N (2008). Mapping quality profile of Ethiopian coffee by origin. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14-17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 328-333. |
[17]
also pointed out that although Jima coffee always has a nice wine quality, some pitting defects include moldy, earthy, and secondary contamination defects in the wine, often resulting from post-harvest management.
The International Organization for Standardization defines quality as "the ability of a product, system or process to meet the needs of customers and other interested parties in accordance with required criteria." The word "attitude" can also be used to describe such characteristics. Quality coffee standards and decisions may change over the years. However, today this concept varies from production to consumption
[29] | Leroy, T. Ribeyre, F. Bertrand, B. Charmetant, P. Dufour, M. Montagnon, C. Marraccini, P. and Pot, D. Genetics of coffee quality.Braz. J. Plant Physiol. 2006: 18(1): 229-242. |
[29]
. For example, at the farmer level, good coffee is a combination of production quality, cost and ease of cultivation; At the exporter or importer level, good coffee is a combination of coarse grain, flawless, regularity of products and tonnage. Physical properties and associated costs; Coffee quality at the roasting level is related to moisture content, stability properties, history, price, biochemical composition and sensory quality
[29] | Leroy, T. Ribeyre, F. Bertrand, B. Charmetant, P. Dufour, M. Montagnon, C. Marraccini, P. and Pot, D. Genetics of coffee quality.Braz. J. Plant Physiol. 2006: 18(1): 229-242. |
[29]
.
It must be said that each consumer market or country can define its own perspective; Coffee quality among consumers; price, taste, awareness and impact on health, historical, environmental and social (organic coffee, honest marketing etc.) ISO in particular, for green coffee, the region and region where the coffee is grown, year of harvest, humidity, all issues, respectively hundreds of lines and more It creates quality standards that require many details such as. - Damaged beans and large beans. This ISO standard specifies how to measure some of these properties, including spots, moisture content, core size, some chemical compositions, and pitting preparation standards. Quality is defined as conformity to the requirements of the Ethiopian Quality and Standards Authority or fitness for use. Requirements must be agreed upon by all parties involved in the work (customers, processes, suppliers, etc.) and understood by all parties involved in the procedure. On the contrary, the purpose of establishing the Coffee Quality Control and Auction Center is to control the quality of coffee, thus making coffee a business in line with standards, with the development and traditional work of Ethiopia's widespread coffee production. Coffee has only one purpose: to give happiness and pleasure to users with its taste, aroma and physical benefits. Therefore, the relative price and value of an amount of coffee depends on its quality, especially the quality of its liquid or cup
[1] | Agwanda, C. O., Baradat, P., Eskes, A.B., Cilas, C. and Charrier, A. 2003. Selection for bean and liquor qualities within related hybrids of Arabica coffee in multi- local field trials.Euphytica. 131: 1-14. |
[1]
. An important part of coffee is a good cup, also known as a good drink or a good wine, which is the price standard
[1] | Agwanda, C. O., Baradat, P., Eskes, A.B., Cilas, C. and Charrier, A. 2003. Selection for bean and liquor qualities within related hybrids of Arabica coffee in multi- local field trials.Euphytica. 131: 1-14. |
[1]
.
2. Contributors to Coffee Quality
Since many activities have different effects on coffee quality, many authors have included them. Therefore, the precautions to be taken are briefly explained below. Cup quality is a complex characteristic affected by many variables, such as species or variety (genetic variables), environmental conditions (ecological variables), agricultural practices (cultivation variables), production systems (postharvest), storage conditions, industrial processing, drinking water, etc. . planning and consumer preferences
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
. The coffee industry uses very good coffee. One of the products in great demand is premium coffee. These include raw and roasted meat, nice aroma and good taste
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
.
However,
over
time,
the
quality
of
coffee
produced
by
Ethiopian
farmers
decreased.
Additionally,
land
genotype,
climate
and
soil
characteristics,
agricultural
practices,
harvesting
techniques
and
timing,
postharvest
procedures,
grading,
packaging,
storage
production
and
transportation
all
affect,
increase
or
decrease
the
quality
of
coffee
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
.
Likewise,
[16] | Dedecca DM (1957). Anatomia e desenvolvimento ontogenético de Coffea arabica L. var. Typica Cramer. Bragantia 16: 315-355. |
[16]
said
that
everything
such
as
various
plants,
characteristics
of
the
planting
site
and
climate,
as
well
as
care
during
planting,
harvesting,
storage,
preparation
for
export
and
transportation,
are
necessary
for
good
coffee.
Although
factors
other
than
climate
can
be
influenced
by
humans
and
play
an
important
role
in
the
final
decision
regarding
green
coffee,
the
authors
believe
that
the
plant
varies
and
important
events
are
constant
and
therefore
control
the
characteristics
of
green
coffee.
Coffee.
In
addition,
inadequate
harvesting,
processing,
storage
and
transportation
systems
of
Ethiopian
coffee
also
contribute
to
the
coffee's
inability
to
maintain
its
quality.
2.1. Climate and Soil Variables
The environment also has an impact on coffee quality
[15] | Decasy, F., Avelino, J., Guyot, B., Perriot, JI., Pineda, C., Cilas, C. 2003. Quality of different Honduran coffees in relation to several environments.J. Food Sci. 68: 2356-2361. |
[15]
. The distribution of rainfall and sunlight affects flowering, growth and maturation of legumes. Main variables include elevation, daily variation, rainfall amount and distribution, and soil physical and chemical properties. Climate, elevation and shading have significant effects on temperature, light and humidity during ripening. According to
[14] | De Castro RD, Marraccini P (2006). Cytology, biochemistry and molecular changes during coffee fruit development. Brazilian Journal of Plant Physiology, 18፡ 175-199. |
[14]
, at higher altitude (lower temperature) or in the shade, coffee fruits ripen more slowly, allowing more time for the coffee beans to ripen, resulting in more coffee beans than at the bottom. Coffee beans come from us. The community growing in the area is denser and tastes better. Altitude (or total sun). Slow time is therefore important for a good cup and is probably sufficient for all the biochemical processes necessary to develop a good drink to occur
[37] | Silva, E A, Toorop PE, van Aelst AC, Hilhorst HW (2004). Abscisic acid controls embryo growth potential and endosperm cap weakening during coffee (Coffea arabica cv. Rubi) seed germination. Planta 220: 251 261. |
[37]
. For example, Arabica coffee plants at higher altitudes were found to contain more oil and chlorogenic acid. In comparison, a more dedicated space for fruit (large bean pot investment) will be associated with a better cup as well as the quality of longlasting beans. After extensive research, he realized that the best coffee beans were those grown in fertile volcanic soil. Coffee quality has long been thought to be greatly affected by the acidity of the coffee brew. Acidity is often thought to be desirable, especially in some East African and Central American coffees
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
. However, acidity is the ultimate in acidity and can be negative. Grown in mineralrich volcanic soil and at high altitudes, coffee is associated with acidity. Additionally,
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
stated that if other variables are constant, higher altitudes will produce better coffee, while coffee from lower regions is quite fullbodied. Additionally, coffee from higher altitudes is stronger, more flavorful, and more acidic. According to
[41] | Woelore WM (1995). Parchment arabica coffee storage. In COLLOQUE Scientifique International sur le Café, 16. Kyoto (Japón), Avril 9-14. |
[41]
, submerged fermentation process is recommended for the Ethiopian environment, while long fermentation is recommended for various agroecologies. The authors say that depending on the fermentation technology, it will be carried out at altitudes of 1200 m and below, 120015000 m, 15001800 m and above 1800 m. According to
[41] | Woelore WM (1995). Parchment arabica coffee storage. In COLLOQUE Scientifique International sur le Café, 16. Kyoto (Japón), Avril 9-14. |
[41]
, factors such as total precipitation, relative humidity, maximumminimum temperature affecting water vapor in the air and storage time are effective on the quality and preservation of parchment coffee. Prolonged drought can also reduce legume quality
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. Most coffee drinkers now agree that there is little (if any) difference between purebred Arabica varieties grown under the same agroclimatic conditions
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
.
2.2. Pre-Harvest and Harvest Factors
According to
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
, South American coffee fertilized with more nitrogen is lower, lighter and finer than unfertilized beans. When nitrogen is too much, the caffeine content increases and the coffee tastes bitter. The phosphorus, calcium, potassium and magnesium content in the soil has little effect on the caffeine and chlorogenic acid content in coffee beans. Zinc deficiency can lead to the production of small, greyish beans that produce lowquality alcohol
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. However, magnesium deficiency can affect the quality of your glass
[31] | Mburu, J. K. 1999. Notes on coffee processing procedures and their influence on quality.Kenya coffee. 64(750): 2861-2867. |
[31]
. High levels of potassium (>1.75%) and calcium (>0.11%) in legumes are associated with a “hard” and bitter taste
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. According to
[38] | Taye Kufa. Environmental Sustainability and Coffee Diversity in Africa, 2010. |
[38]
, application of decomposed coffee husks at the rate of 10 tons per hectare (1 ton per hectare) (4 kg body weight per tree) was found to increase the coffee yield of trees. A significant increase in the growth and yield of ripe coffee has been reported after the use of coffee beans and husks. On the other hand, there is no relationship between the structure and characteristics of the bean and its phosphorus concentration. However, frequent use of ingredients such as grass or animal feed can lead to a high percentage of brown coffee beans and poor quality products. This effect is associated with magnesium deficiency resulting from high potassium in grass and high potassium and calcium content in feces
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. Bean size and taste are often affected by growing conditions (plant management, appropriate planting and pruning)
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. However, the relationship between crop management and overall coffee quality has not been investigated in detail. Diseases from pests and diseases can directly affect cherries or weaken the plant, causing the fruit to fail to ripen or become damaged.
Low yield can also be caused by diseases and insects (such as mites and leaf miners)
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. For example, according to
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
, the coffee berry weevil Hypothenemuschampii feeds on coffee beans and multiplies there, thus reducing the quality of the coffee beans. Cockroaches are carriers of disease and can damage coffee beans and cause a bitter taste. Cherries become infected when the Ceratitis capitata fly feeds on the mucus, and the second infection gives the cherries their potato flavor. When coffee is dried on bare ground, Ochola, Carbozoa and Melanozoa species produce OTA (Ochrotoxin A), a mycotoxin
[19] | EshetuDerso and Girma adugna. 2008. Management of moulds and mycotoxin contamination in coffee. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14-17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 271- 278. |
[19]
.
According to
[32] | Muschler, R.G. 2001. Shade improves coffee quality in a suboptimal coffee zone of Costa Rica. Agro forestry systems. 51: 131- 139. |
[32]
, it has been found that shading, especially for coffee beans grown in suboptimal (optimal) coffee production, can improve the acidity and body of brewed coffee and the appearance of green and roasted coffee beans. This is done by encouraging slow and even grain harvesting and fruitlike ripening. Shade increases the sugar content, which is important in creating coffee aroma. Therefore, according to
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
, young tree samples will be small, have a subtle smell, but have a pleasant smell. Ancient growing methods produce roug, unique, richly flavored beer.
Coffee beans with good taste, acidity and body are produced from middleaged trees that are 15 to 20 years old
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
. According to the results of two studies, tree physiology, age and harvest time are effective in determining the final properties of the product
[7] | Berthaud J and A Charrier. Genetic resources of Coffea. pp: 1-42. In: Clarke RJ, Macrae R (eds), Coffee: Agronomy, vol. IV, Elsevier Applied Science, London, 1988. |
[7]
. In fact, the chemical composition of mung beans has been shown to be greatly affected by the age of the tree, the location of the fruit on the tree, and the ratio of fruit wood to leaves. In addition, ripeness also affects the quality of the coffee.
The harvesting method has the greatest impact on natural coffee. Most experts agree that hand picking and growing produces the best green coffee by reducing the number of coffee crops compared to harvesting. According to
[7] | Berthaud J and A Charrier. Genetic resources of Coffea. pp: 1-42. In: Clarke RJ, Macrae R (eds), Coffee: Agronomy, vol. IV, Elsevier Applied Science, London, 1988. |
[7]
, red cherries harvested at the beginning of the picking season contain fewer coffee beans than yellow or green cherries harvested at the end of the picking season. Bean size, chemical composition and cup quality are examples. On the other hand, picking early red cherries in Costa Rica produces the best Arabica coffee. In contrast,
[18] | EndaleTaye, Behailu Weledesenbet, BayettaBellachew and FabriceDavrieux. 2008. Effects of genotypes and fruit maturity stage on caffeine and other biochemical constituents of arabica coffee. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14-17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 169-172. |
[18]
noted that routine analysis using highperformance liquid chromatography showed low caffeine content in coffee beans stored at the immature stage (immature) and overripe beans (HPLC). Their research suggests this may be related to slow metabolism and biodegradation of caffeine during the immature and overripe stages of the fruit.
2.3. Post-Harvest Factors
Postharvest methods can affect coffee quality
[26] | Jacquet, M., GetinetKelekle, Legesse Seyoum and Teshome Menjour. 2008. Coffee sector strategy on production, productivity, quality and marketing sector final report volume IV. Coffee Improvement Program IV, September, 2008, Addis Ababa, Ethiopia. |
[26]
. Processing is an important step in coffee production and determines the quality of the product
[31] | Mburu, J. K. 1999. Notes on coffee processing procedures and their influence on quality.Kenya coffee. 64(750): 2861-2867. |
[31]
. Wet or dry methods are used to prepare coffee, each varying in complexity and quality
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. Ethiopia uses dry and wet processing technologies, which account for 70% and 30% of the country's total coffee production, respectively
[26] | Jacquet, M., GetinetKelekle, Legesse Seyoum and Teshome Menjour. 2008. Coffee sector strategy on production, productivity, quality and marketing sector final report volume IV. Coffee Improvement Program IV, September, 2008, Addis Ababa, Ethiopia. |
[26]
.
According to
[12] | Clifford, MN. 1985. Chemical and physical aspects of green coffee and coffee products. In: Clifford, M.N. and Willson, K.C (eds.), Coffee: Botany, Biochemistry and Production of Beans and Beverage. Croom Helm, London. pp. 305-374 CO. Coffee Production Data. Www.ico.org. Accessed on June 15, 2017: International Coffee Organization, 2017. |
[42] | Wolfrom ML, Laver ML, Patin DL (1961). Carbohydrates of coffee bean. II. Isolation and characterization of a mannan. J. Org. Chem. 26: 4533-4536. |
[12, 42]
, dry processed Arabica coffee has a rich aroma, moderate acidity, and a slightly astringent taste. Additionally, washed coffee is considered to be more acidic than processed (dry) coffee. This may be because organically processed coffee has more body than wet processed coffee; because the body hides the acidity of the coffee
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
. Analysis of roasted coffee provides the difference between dry and washed coffee with high correlation (11 out of 11 workers). According to their report, the work that occurs during the processing of coffee beans causes the initial product to be similar, although the coffee has different quality and is subjected to different processes. The natural sun drying system is the first technology used to harvest and dry whole fresh fruits and is used to make coffee in most of the study area. Farmers generally prefer to pick red fruits by hand; however, income and theft concerns may lead to early harvest of the crop
[26] | Jacquet, M., GetinetKelekle, Legesse Seyoum and Teshome Menjour. 2008. Coffee sector strategy on production, productivity, quality and marketing sector final report volume IV. Coffee Improvement Program IV, September, 2008, Addis Ababa, Ethiopia. |
[26]
.
After drying, the cherries are sold to the local market "Akrabis" or to secondhand processing partners
[10] | CFC (Common Fund for Commodities). 2004. Improving coffee quality in east and central Africa through enhanced Processing practices; A (CFC/ICO/22) Project for Rwanda and Ethiopia, Final Appraisal Report. The Netherlands, Amsterdam. pp. 10-11. |
[10]
. The second process is called wet processing and involves processing fresh cherries in three stages: removing the skin and mucilage, fermenting and washing the cherries, and drying the coffee parchment
[10] | CFC (Common Fund for Commodities). 2004. Improving coffee quality in east and central Africa through enhanced Processing practices; A (CFC/ICO/22) Project for Rwanda and Ethiopia, Final Appraisal Report. The Netherlands, Amsterdam. pp. 10-11. |
[10]
. The time it takes to dry your coffee parchment to the desired moisture level depends on the time taken up during drying and the thickness of the parchment layer. According to
[5] | BehailuWeldsenbet and Solomon Endris. 2006. The Influence of Shade During Fermentation Stage of Wet Processing on the Cup Quality of Arabica Coffee 21stInternational Scientific Conference on Coffee science (ASIC). September 2006, Montpellier, France. pp. 549-553. |
[5]
, parchment coffee dried to the darkest depth (5 cm) has the lowest pitting quality, while other drying depths (2, 3 and 4 cm) give higher yields. Parchment coffee is dried and ready for delivery to the store (also in parchment paper). Like other Ethiopian coffees, Jimma export coffee must be traded through the central auction in Addis Ababa
[10] | CFC (Common Fund for Commodities). 2004. Improving coffee quality in east and central Africa through enhanced Processing practices; A (CFC/ICO/22) Project for Rwanda and Ethiopia, Final Appraisal Report. The Netherlands, Amsterdam. pp. 10-11. |
[10]
. In addition, the fermentation process during coffee cleaning has a significant impact on the quality of the final product
[41] | Woelore WM (1995). Parchment arabica coffee storage. In COLLOQUE Scientifique International sur le Café, 16. Kyoto (Japón), Avril 9-14. |
[41]
. Twostage fermentation, or “dry” fermentation, followed by submersion has been shown to improve the appearance of green and roasted coffee
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
. According to their analysis, soaking for 24 hours after fermentation produces better raw and roasted meats than soaking for 8 or 16 hours, while soaking for 48 hours has the opposite effect, reducing cooking quality rather than improving it. However, according to
[5] | BehailuWeldsenbet and Solomon Endris. 2006. The Influence of Shade During Fermentation Stage of Wet Processing on the Cup Quality of Arabica Coffee 21stInternational Scientific Conference on Coffee science (ASIC). September 2006, Montpellier, France. pp. 549-553. |
[5]
, methods such as dry fermentation, submerged fermentation, digestive enzymeaccelerated fermentation or cleaning to remove mucilage do not affect the quality of the wine, and there is no evidence that a specific method has been established. A better way to drink alcoho. According to the authors, fermented coffee high in coffee hulls produced better green coffee, roasted coffee and alcohol than the control without hulls, and alcohol was not affected well by desserts described as strong. bitter, fruity or dirty.
The natural fermentation of coffee depends on many factors such as the environment, pH, temperature, microflora and bacterial level in the water used, the variety of ripe fruit used for pulping, and the history of the beans depending on the region and culture. Slight change in structure and job selection
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
. Moreover, according to
[5] | BehailuWeldsenbet and Solomon Endris. 2006. The Influence of Shade During Fermentation Stage of Wet Processing on the Cup Quality of Arabica Coffee 21stInternational Scientific Conference on Coffee science (ASIC). September 2006, Montpellier, France. pp. 549-553. |
[5]
, fermenting coffee in shaded tanks leads to more fermentation processes and better coffee compared to fermenting in dark tanks.
However,
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
examined the working water of Jimma coffee. He explained that their ingredients are diverse, including beans of all shapes and sizes and pure alcohol. This is most likely because this mixture contains adzuki beans, which are beautifully green in color and very tender. According to the authors, it cannot change the environment, plant seeds, or change the environment itself. Instead, we should focus on the most important postharvest processes that can have a major impact on coffee quality, such as picking, processing, drying, storing and transporting coffee cherries. Cup quality is also affected by the length of the coffee beans and storage conditions
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
. Prolonged storage in a warm, humid environment causes the coffee beans to become moist, thus reducing the appearance of green beans and roasting the quality of the wine
[41] | Woelore WM (1995). Parchment arabica coffee storage. In COLLOQUE Scientifique International sur le Café, 16. Kyoto (Japón), Avril 9-14. |
[41]
.
2.4. Genetic Variables
Plant physiology, harvesting, postharvest techniques, and plant genetics (species and genotype) all influence coffee quality
[29] | Leroy, T. Ribeyre, F. Bertrand, B. Charmetant, P. Dufour, M. Montagnon, C. Marraccini, P. and Pot, D. Genetics of coffee quality.Braz. J. Plant Physiol. 2006: 18(1): 229-242. |
[29]
.
[1] | Agwanda, C. O., Baradat, P., Eskes, A.B., Cilas, C. and Charrier, A. 2003. Selection for bean and liquor qualities within related hybrids of Arabica coffee in multi- local field trials.Euphytica. 131: 1-14. |
[1]
tested the value of four variables (acidity, body, flavor and overall structure) as criteria for genetic improvement of the overall quality of wine for all samples. According to the authors, based on correlation, repeatability and sensitivity analysis, aroma testing was found to be the best option for genetic improvement of good preparation of Arabica coffee. This quality has a very good analysis, has a good genetic connection with taste and is very useful in distinguishing coffee genotypes.
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[44]
also showed that genes play a role in determining the production of chemicals that serve directly as flavors or as flavors introduced during roasting. Therefore, container quality should be the most important factor in selecting varieties for planting
[20] | Estanislau WT (2002). Modelo funcional de desenvolvimento de sementes de cafeeiro (Coffea arabica). Lavras, Universidade Federal de Lavras. MSc Thesis, Lavras. |
[44] | YigzawDessalegn. 2005. Assessment of cup quality, morphological, biochemical and molecular diversity of C. arabica L. genotypes of Ethiopia. PhD thesis, University Free State. p. 97. |
[20, 44]
. Additionally,
[4] | Behailu W, Abrar S, Nugussie M, Solomon I (2008). Coffee Processing and Quality Research in Ethiopia. In: Proceedings of a National Work Shop Four Decades of Coffee Research and Development in Ethiopia. 14- 17 August 2007, EIAR, Addis Ababa, Ethiopia. pp. 307-316. |
[4]
used coffee experts to improve the cup quality of different types of coffee. Both researchers found that drinkers described a similar range of food quality; This shows that each group can be confident in their choice of cupping quality.
[1] | Agwanda, C. O., Baradat, P., Eskes, A.B., Cilas, C. and Charrier, A. 2003. Selection for bean and liquor qualities within related hybrids of Arabica coffee in multi- local field trials.Euphytica. 131: 1-14. |
[1]
Similar findings have been made regarding the quality of coffee beans and alcohol. In terms of effects of genotype x environment interactions on quality,
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
found small effects. Quality traits such as coffee bean size and cup quality were not affected by genotype x environment interactions.
[36] | Selvakumar, M. and Sreenivasan, M.S. 1989.Studies on morphology and quality of Ethiopian arabica coffee.Journal of Plantation Crops. 16: 321 -324. |
[36]
noted that cup quality varied from good to excellent among 54 Arabica coffee varieties collected from Kaffa, Ethiopia. Genotype is very important because it affects the size and shape of the bean, as well as important factors such as color, chemical composition and flavor
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
. The shape and structure of elephants, peas and hollow beans are a combination of genetic and environmental influences
[40] | Wintgens JN (2004). Coffee: growing, processing, sustainable production. A guidebook for growers, processors, traders, and researchers. WILEY-VCH Verlag GmbH & Co. KGaA. |
[40]
.