Coffee Science
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3355
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Resultados da Pesquisa
Item Quality of Coffea canephora beverage as a function of genotype, processing method and grain size(Editora UFLA, 2020) Lima, Julião Soares de Souza; Silva, Samuel de Assis; Fonseca, Abel Souza da; Pajehu, Levi FragaAfter harvesting, the coffee beans tend to lose quality during fruit processing and grain storage, thus affecting the quality of the obtained beverage. The objective of this research was to evaluate the quality of the beverage obtained from conilon coffee (Coffea canephora) for seminal (S) and clonal (C) genotypes, two processing methods of the coffee cherries (natural and peeled), different sizes of coffee beans determined by sieves and two storing periods of 45 and 90 days. The coffee cherries were dried, natural (N) and peeled (P), on cement floor in greenhouse and classified through the 13, 14, 15, 16 and 17 sieves. After 45 days of storage, it is observed that the overall score (OS) of the beverage prepared from peeled clonal (PC) and natural seminal (NS) coffee beans increased with increasing bean size (sieves 15 and 16). The treatments PS13, PS14, PS15, PS16, PC15 and PC16 were significantly different, however, the overall score (OS) decreased after samples were stored for 90 days. It is concluded that after storing the coffee bean samples for 45 and 90 days, the OS decreased significantly for peeled seminal coffee (PS) sieves 13, 14, 15, and 16 and peeled clonal coffee (PC) sieves 15 and 16.Item Fuzzy logic in the spatial and temporal distribution in the quality of the beverage in conilon coffee(Editora UFLA, 2019-04) Fonseca, Abel Souza da; Lima, Julião Soares de Souza; Silva, Samuel de Assis; Dardengo, Maria Christina Junger Delôgo; Xavier, Alexandre CandidoThe objective in this study was to evaluate the spatial and temporal variability of the beverage quality by applying the fuzzy classification in the final global sensory analysis, for Coffea canephora Pierre ex A. Froehner, in two consecutive harvests. The studied variables were: fragrance (aroma), flavor, bitterness (sweetness), set, balance, cleaning, aftertaste, mouth feel, uniformity, salinity (acidity) and drink (global note). To the average overall scores of the drinks obtained on the cup-tasting at 80.0 points of a sampling, the mesh has applied the function of association of the fuzzy classification linear model to determine the degree of pertinence. The data were analyzed by the descriptive statistics and then by geostatistics to verify the existence and quantify the degree of spatial dependence of the variables. In the interval classified as “very good coffee” is found in the global average grade, in the two harvests. The methodology fuzzy applied in the global beverage note of the coffee conilon seminal made it possible to determine their spatial variability in the same distribution pattern in the two harvests, close ranges, and adjustments to the spherical model, which was confirmed by the spatial correlation of 61.6% among the fuzzy maps for the global score.Item Fuzzy logic application and cluster analysis in the quality of the beverage from conilon coffee(Editora UFLA, 2018-10) Lima, Julião Soares de Souza; Silva, Samuel de AssisThe quality of coffee beverages has been under study due to the demand of the consumer market for both arabica and conilon coffee. The aim of this work was to study beverage quality from different clones by means of sensory analysis, in 13 clones of the variety Victoria INCAPER 8142 produced at average altitudes of 100.0 m and 528.0 m and with the cherry fruits processed by natural drying or depulping. Fuzzy classification was adopted for the global scores obtained in the sensory analysis, on a scale of 70.0 to 100.0 points, with the Euclidean distance from the cluster analysis being used to define the dissimilarity between the global fuzzified scores for the different clones at the two altitudes and for the two methods of processing the fruit. Clones C4 and C10, at the intermediate maturation stage, presented a mean global score (GS) of 85.0 points for the coffee produced at the altitude of 528.0 m and for the depulped fruit, corresponding to a degree of fuzzy pertinence (FI) of 0.50, and being classified as fine coffee. These same clones presented dissimilarities in the beverage produced by the depulped fruit, with better quality for the coffee at the higher altitude. The fuzzy classification taken together with the cluster analysis to interpret the mean global scores (GS) in the sensory analysis of the beverage for the different treatments under study identified variation in beverage quality.Item Spatial variability of the productivity and the nutritional condition of Coffee canephora(Editora UFLA, 2015-10) Fonseca, Abel Souza da; Lima, Julião Soares de Souza; Silva, Samuel de Assis; Xavier, Alexandre Candido; Drumond Neto, Antonio PereiraUtilizing precision farming techniques along with the Diagnosis and Recommendation Integrated System (DRIS) allows crop management to be improved, thereby making it possible to better control plant nutrition and to assist in reducing fertilizer expenditures. This study aimed to evaluate the spatial variability of the nutritional status of conilon coffee (Coffea canephora), using the Nutritional Balance index (NBI). 140 points were georeferenced within a coffee crop, each sampling point contained five plants. Leaf samples were analyzed in order to determine levels of N, P, K, Ca, Mg, S, Fe, B, Zn, Mn and Cu. The crop showed itself to have a nutritional imbalance, as shown by the deficiency and excess variation of some nutrients in the crop. The nutritional balance index (NBI) was not correlated with productivity (Prod), indicating that, when the crop has a high nutritional imbalance IBN is not a good tool for establishing nutritional standards for conilon coffee.Item Spatial and temporal variability of the productivity of coffee canephora(Editora UFLA, 2014-07) Lima, Julião Soares de Souza; Costa, Felipe Pianna; Xavier, Alexandre Cândido; Oliveira, Rone Batista de; Silva, Samuel de AssisGIS techniques have been used in many agricultural crops to study and assess the causes of spatial and temporal variability in production. The spatial and temporal variability of the canephora (conilon) coffee productivity was analyzed in the present work in three consecutive agricultural years (harvests) using geoprocessing techniques. A sampling grid with 109 georeferenced points was built with five plants per point. Significant differences in productivity were observed, with the lowest productivity recorded for the harvest 3 in 93.5% of the area. The productivity index (YI) varied from -18.0% in harvest 2 to harvest 1 and from -57.0% in harvest 2 to harvest 3, showing increasing decrease between different harvests.Item Atributos físicos do solo e sua relação espacial com a produtividade do café arábica(Editora UFLA, 2013-10) Silva, Samuel de Assis; Lima, Julião Soares de SouzaObjetivou-se, neste trabalho, determinar a distribuição dos atributos físicos do solo e avaliar a sua relação espacial com a produtividade do café arábica, utilizando para isso, métodos de geoestatística multivariada. O experimento foi realizado em uma área cultivada há cinco anos com Coffea arabica L. cv. Catuaí, em um Latossolo Vermelho-amarelo húmico. Para o mapeamento do solo e o levantamento da produtividade da cultura, construiu-se uma malha de amostragem, totalizando 100 pontos georreferenciados. Os atributos físicos estudados foram as frações granulométricas (areia grossa, areia fina, silte e argila) e a densidade do solo. A produtividade foi avaliada pontualmente, determinando-se os valores de produção de café beneficiado. Os dados foram analisados pela estatística descritiva e exploratória, e a relação entre os atributos físicos e a produtividade foram analisadas pela correlação linear de Pearson. Em seguida, os dados foram submetidos à análise geoestatística, a fim de verificar a existência e, nesse caso, quantificar o grau de dependência espacial dos atributos e da produtividade e da relação entre esses. A produtividade do café se correlacionou com os atributos físicos do solo, com exceção do silte, uma vez que foi registrada correlação positiva com as demais frações granulométricas e negativa com a densidade do solo. Tanto a produtividade quanto os atributos físicos do solo apresentaram distribuição espacial, com elevada continuidade espacial. A cokrigagem foi eficiente para mapear a distribuição espacial da produtividade, utilizando-se como covariáveis os atributos físicos do solo.Item Spatial variability of the nutritional condition of canephora coffee aiming specific management(Editora UFLA, 2010-09) Oliveira, Rone Batista de; Lima, Julião Soares de Souza; Silva, Samuel de Assis; Antuniassi, Ulisses Rocha; Silva, Alessandra Fagioli daMapping the plant nutritional condition allows viewing different regions in a cropping area, providing the producers with different criteria to use foliar and soil fertilization. The aim of this study was to evaluate the spatial variability of the nutritional condition of canephora coffee (Coffea canephora Pierre ex Froehner) regarding the site specific management of foliar and soil fertilization. In a one hectare area 60 georeferenced points were sampled at irregular intervals. There were five plants in each sampled point; two pairs of leaves were removed from the lateral branches (3 rd and 4 th pairs from extremity to the basis) in the cardinal points of each plant, counting up 40 leaves per point. The foliar samples were chemically analyzed for the following nutrients: N, P, K, Ca, Mg, S, B, Cu and Zn. The same pattern of spatial dependence was presented with adjustment for K and B. Except for N and P, which presented random distribution, the other nutrients presented mild to severe spatial dependence justifying the geostatistical data analysis for making maps for differential and located, foliar and soil fertilizer application in coffee crop.Item Variabilidade espacial de atributos químicos do solo cultivado com café arábica (Coffea arabica L.) sob diferentes manejos(Editora UFLA, 2010-05) Silva, Alessandra Fagioli da; Lima, Julião Soares de Souza; Souza, Gustavo Soares de; Oliveira, Rone Batista deObjetivou-se, neste trabalho, avaliar a variabilidade espacial de atributos químicos de duas áreas cultivadas com café, sob manejo orgânico e convencional, e calcular o porcentual da diferença entre os atributos químicos da área do manejo convencional, em relação ao manejo orgânico. Em cada área foi construída uma malha com 40 pontos georreferenciados com amostragens do solo realizadas nas camadas de 0-0,10 m e 0,10-0,20 m, na projeção da copa do cafeeiro, para análises de pH, SB, K, P, Ca e Mg. Os dados foram analisados por estatística descritiva e geoestatística. A partir dos mapas dos atributos químicos do solo foi calculado o mapa do porcentual da diferença dos atributos químicos do manejo convencional em relação ao manejo orgânico, por meio de operações algébricas no sistema de informações geográficas. Os resultados indicam que todos os atributos químicos do solo apresentam dependência espacial nos dois manejos e nas duas camadas. Na análise dos atributos químicos do solo observa-se menor variabilidade espacial na área de manejo orgânico em relação ao manejo convencional, indicando zonas homogêneas para a aplicação de adubos de forma diferenciada. O porcentual das diferenças do manejo convencional em relação ao manejo orgânico dos atributos químicos na área, na camada de 0-0,10 m e 0,10-0,20 m é de 54,80% e 35,61%, respectivamente.