Biblioteca do Café
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1
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Resultados da Pesquisa
Item Eficiência de uso de macronutrientes e correlação com o crescimento em genótipos de café(Embrapa Café, 2019-10) Poltronieri, Yonara; Cecon, Paulo Roberto; Pereira, Vanessa Vitoriano; Lopes, Luiz Mário Valente; Araujo, Uriel Laurentiz de; Rodrigues, Isabel da CostaO objetivo desse trabalho foi verificar as eficiências de uso de N, P, K, Ca, Mg e S em mudas de quinze genótipos de Coffea arabica e correlacioná-las com as características do crescimento vegetativo. O estudo foi conduzido no viveiro de café do Departamento de Fitopatologia da Universidade Federal de Viçosa em Viçosa, MG. O delineamento experimental foi inteiramente casualizado com quinze tratamentos (Cultivares: Icatu Amarelo IAC 3282; Catiguá MG3; Aranãs; Catuaí Vermelho IAC 144; Paraíso MG H419-1; Catiguá MG2; Liberdade e Araponga MG1. Progênies: Sagarana T12; Sagarana T19; H1189-9-80-3; Progênie 15/ Icatu x Elite; H 514-7-4-5; H 1189-12-52-2 e H 29-1-8-5) e três repetições. Aos dezoito meses após o transplantio das mudas, foram avaliadas as características do crescimento: diâmetro do caule; altura da planta; número de nós do ramo ortotrópico e volume de raízes. No material vegetal foi realizada a análise dos teores de N, P, K, Ca, Mg e S. A partir da massa seca total e dos teores dos nutrientes nas planta foram calculados os conteúdos e posteriormente as eficiências de uso dos macronutrientes. As progênies H 1189-9-80-3, H 514-7-4-5 e Sagarana 12 são as mais eficientes no uso de macronutrientes. A produção de massa seca total é a característica que apresenta as melhores correlações com as eficiências de uso dos macronutrientes do cafeeiro arábica. Dentre as características de crescimento não destrutivas da planta, o diâmetro do caule apresenta os maiores coeficientes de correlação com as eficiências de uso de macronutrientes.Item Effects of nitrogen and potassium on the chemical composition of coffee beans and on beverage quality(Editora da Universidade Estadual de Maringá - EDUEM, 2015-07) Clemente, Junia Maria; Martinez, Herminia Emilia Prieto; Alves, Leonardo Corrêa; Finger, Fernando Luíz; Cecon, Paulo RobertoThe ratio of nitrogen (N) to potassium (K) is important in the production of specialty coffees because the relative amounts of N and K can either suppress the formation or increase the concentration of compounds that are essential to the flavor and aroma of specialty coffees. The purpose of this study was to evaluate the effect of different N:K ratios (w/w) and K doses on the cup quality of coffee. The concentrations of chemical compounds essentials to achieve good flavor and aroma, the N and K contents, and the caffeine contents of coffee leaves and beans were evaluated in this study. The N:K ratio and the K dose were found to be important factors in cup quality, the best quality corresponding to an N:K ratio of 1:1.56. The best cup quality was obtained from beans with greater PPO activity, caffeine, color index, and sugars and lower total tritatable acidity, pH, electrical conductivity and leached potassium. Keywords: Coffea arabica L., coffee, caffeine, fertilization.Item Decomposition and nitrogen mineralization from green manures intercropped with coffee tree(Editora UFLA, 2018-01) Cardoso, Rosileyde Gonçalves Siqueira; Pedrosa, Adriene Woods; Rodrigues, Mateus Cupertino; Santos, Ricardo Henrique Silva; Cecon, Paulo Roberto; Martinez, Herminia Emilia PrietoThe knowledge about the rate of decomposition and nitrogen mineralization of green manures provides synchronization with the higher absorption stage by the coffee tree. The rate of decomposition and nitrogen mineralization varies according to the species of green manure and with the environmental factors. The aim of the present study was to evaluate the decomposition and nitrogen mineralization of two green manures intercropped with coffee trees for three different periods. The experiment was divided into two designs for statistical analysis, one referring to the characterization of plant material (fresh mass, dry matter, dry matter content, nitrogen concentration and accumulation in the jack bean (Canavalia ensiformis) and hyacinth bean (Dolichos lablab) and another to evaluate the rate of decomposition and N mineralization of these species. The decomposition rate decreased in both species as their growth time increased in the field. The decomposition was influenced by the phenology of green manures. Nitrogen mineralization of the jack bean decreased as the growth period in the field increased and was faster than hyacinth bean only when cut at 60 days. The N mineralization was slower than mass decomposition in both species.Item Production, chemical composition, and quality of Arabic coffee subjected to copper doses(Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2018-04) Martinez, Herminia Emilia Prieto; Lacerda, José Soares de; Clemente, Junia Maria; Silva Filho, Jaime Barros da; Pedrosa, Adriene Woods; Santos, Ricardo Henrique Silva; Cecon, Paulo RobertoThe objective of this work was to evaluate the effect of copper on the chemical composition of coffee beans and on the quality of the beverage, relating both of them to the Cu leaf contents in coffee (Coffea arabica) plants. Coffee plants were grown in a hydroponic system containing 0.2, 0.4, 0.8, 1.6, and 3.2 μmol L -1 Cu until fruit setting. Coffee bean production was evaluated, and, after the cherries were dried, the following characteristics were determined: leaf Cu content; total titratable acidity; color index; electrical conductivity; leached K; polyphenol oxidase (PPO) activity; concentrations of caffeine, trigonelline, organic acids, total phenols, chlorogenic acids (3-CQA, 4-CQA, and 5-CQA), sucrose, glucose, arabinose, mannose, and galactose; and sensory quality of roasted beans. Cu increased bean yield, PPO activity, and the concentrations of organic acids, 3-CQA, sucrose, and arabinose. Total titratable acidity, total phenols, 4-CQA, and 5-CQA were reduced with increasing Cu doses. Leaf contents related to the maximum and minimum values of desirable and undesirable quality attributes ranged from 5.6 to 11.4 mg kg -1 Cu, respectively. Copper affects the production and chemical composition of coffee beans, and the attributes related to quality are maximized in plants with low leaf contents of the nutrient.Item Contéudo de zinco em folhas jovens de cafeeiro submetido a injeções sólidas em tronco e pulverizações com sulfato de zinco.(2007) Neves, Yonara Poltronieri; Martinez, Hermínia Emília Prieto; Bayona, Javier Abadía; Cecon, Paulo Roberto; Domingos, Diego Rigueira; Embrapa - CaféAs formas usuais de fornecimento de Zn a cafeeiros são via solo ou via pulverizações foliares, porém, ambas formas possuem desvantagens. O objetivo do presente trabalho foi comparar o efeito do suprimento do Zn via injeções sólidas no tronco e via pulverizações foliares em quatro cultivares de Coffea arabica L.. O experimento foi conduzido em área da Universidade Federal de Viçosa. O delineamento experimental utilizado foi em blocos casualizados com três repetições; três tratamentos e quatro cultivares de Coffea arabica de seis anos de idade (Acaiá IAC-474-19, Icatu Amarelo IAC-3282, Rubi MG-1192 e Catuaí Vermelho IAC-99). Os tratamentos utilizados constituíram-se em: T0 (testemunha, sem Zn); T1 (com pulverização foliar de sulfato de Zn a 0,4 %) e T2 (introdução de uma cápsula de 1,77 g contendo sais de Zn na base do tronco das plantas). Os dados foram submetidos à análise de variância e as médias foram comparadas pelo teste de Tukey a 5% de probabilidade. De maneira geral observou-se que o tratamento utilizando a cápsula de Zn parece ser promissor no fornecimento de Zn ao cafeeiro.