Biblioteca do Café
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1
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Resultados da Pesquisa
Item Case study of modeling covariance between external factors and sensory perception of coffee(Universidade Federal de Lavras, 2023-08-18) Resende, Mariana; Borém, Flávio Meira; Cirillo, Marcelo ÂngeloAnalysis and inference of sensory perceptions in coffee beverages are complex due to numerous random causes intrinsic to productivity, preparation, and especially consumer and/or taster subjectivity. In this context, latent variables often composed of a combination of other observed variables are discarded from conventional analyses. Following this argument, this study aimed to propose a model of structural equations applied to a database, geographical indication of coffees in Serra da Mantiqueira, with a methodological contribution characterized by inclusion of a treatment effect, contemplated by different altitudes at which coffees were produced. From the methodology used, a covariance structure was estimated, and used in another statistical methodology to discriminate the effects. It is concluded that the proposed model proved to be advantageous for allowing the analysis of the relationship of latent variables, production and environmental variations, which are not considered in a sensorial analysis, and showed that, in fact, they influence the sensorial perception, for the coffees produced in the Serra da Mantiqueira region. The correlation structure generated from the covariance matrix adjusted by the model resulted in estimates that could be used in other statistical methodologies more appropriate to discriminate the effects, exemplifying the use of principal components.Item The role of entomopathogenic fungi in controling the coffee berry borer (Hypothenemus hampei Ferrari) at various altitudes of Arabica coffee plantations(Universidade Federal de Lavras, 2022-06-09) Husni, H; Jauharlina, J; Maulidia, NindaA study was conducted to study the effect of altitude on the presence and effectiveness of entomopathogenic fungi in suppressing the development of the coffee berry borer (Hypethenemus hampei Ferr.) in Arabica coffee plantations in Aceh Tengah District, Aceh Province, Indonesia. We found that only the fungus of the genus Beuveria infects CBB pests in the coffee plantations. We also found that the infection rate of this fungus against CBB pests in coffee fields located at an altitude of 900-1,100 m was higher than in coffee fields located at an altitude above 1,100 m. At first observation showed that the attack rate of entomopathogenic fungi against CBB at an altitude of 900-1,100 m; 1,100-1,300 and 1,300-1,500 m were 6%, 3% and 1%, respectively. In the second observation, the attack rate at an altitude of 900-1,100 m, 1,100-1,300 m and 1,300-1,500 m, were 8%, 2% and 1%, respectively. This indicates that the higher the temperature around the coffee plantation, the higher the infection rate (attack) of the Beuveria fungus on CBB. The correlation analysis also showed that an increase in CBB attack on coffee berries was generally followed by an increase in entomopathogenic fungi attack. This indicates that the Beuveria sp fungus has played a role in suppressing and balancing the development of CBB pests in Arabica coffee plantations in Aceh Tengah District.