Coffee Science
URI permanente desta seção${dspace.url}/handle/123456789/3355
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Item Identification of morphoagronomic traits correlated with the N use efficiency in coffee(Editora UFLA, 2025-04-29) Moura, Waldenia de Melo; Ribeiro, Poliane Marcele; Soares, Luciana Gomes; Silva Júnior, Antônio Carlos da; Ferreira, Tatiane Cravo; Gravina, Geraldo de Amaral; Martinez, Hermínia Emília PrietoThe study of nutritional efficiency is an expensive process, as it requires extensive planting areas, several years of evaluation and the destruction of plants. To mitigate these difficulties, a strategy would be to identify easily measurable traits associated with nutritional efficiency in growing a nutritional solution. Thus, the objective of this study was identify morphoagronomic traits correlated with the N-efficiency indices in to assist in selecting coffee genotypes for environments with N restriction. Twenty arabica coffee genotypes were grown in a nutrient solution with a low concentration of nitrogen (1.0 mmol L-1). The experiment was conducted in a randomized block design with three replications. There was variability among the coffee genotypes for all the traits evaluated. Most of the traits evaluated showed greater genetic than environmental influence on phenotypic expression. Heritability (H2) was greater than 70% for most of the traits evaluated, with an emphasis on plant height and internode length, which also had the highest relative variation indices (RVIs). The associations between morphoagronomic traits and nutritional efficiency indices revealed greater contributions of genotypic correlation than of environmental correlation. Among the traits associated with nutritional efficiency indices, stem diameter has the potential for use in breeding programs for the selection of cultivars that present greater nitrogen efficiency in environments with nitrogen restriction.Item Intercropping period between species of green manures and organically-fertilized coffee plantation(Editora UFLA, 2018-01) Cardoso, Rosileyde Gonçalves Siqueira; Pedrosa, Adriene Woods; Rodrigues, Mateus Cupertino; Santos, Ricardo Henrique Silva; Martinez, Hermínia Emília Prieto; Cecon, Paulo RobertoThe adequate supply of nitrogen to coffee plantation is one of the main challenges of organic agriculture. The aim of the present study was to evaluate the effect of organic fertilization with two legume species in different intercropping periods on nitrogen nutrition, initial growth and productivity of coffee plantation. The experimental design was in randomized blocks, in 2x4 split-plot factorial design, being that the plot consisted of two intercrops (coffee+jack bean and coffee+hyacinth bean) and the four intercropping periods (30, 60, 90 and 120 days after sowing of the legume), and the subplot by 50% and 100% of fertilization for the coffee plantation. The increase in the intercropping period between legumes and coffee plantation favored a greater increase in height and node number of coffee trees, besides showing higher heights when fertilized with 50% of the recommended dose and intercropped with hyacinth bean. The intercropping with the hyacinth bean resulted in a larger crown diameter of coffee trees in 2010 and a larger diameter accumulated in the two evaluated years. Higher N contents were found in coffee trees fertilized with 100% of the recommended dose. The legumes supplied the nutritional requirements of the coffee harvest fertilized with 50% of the dose. The bean yield of the processed coffee is not affected by the intercropping with the green manures of jack bean or hyacinth bean.Item Tolerância de progênies de cafeeiros (Coffea arabica L.) ao excesso de manganês em solução nutritiva(Editora UFLA, 2007-01) Zabini, André Vinicius; Martinez, Hermínia Emília Prieto; Silva, Camila AndradeA toxidez de manganês é uma das mais comuns entre os micronutrientes, especialmente em solos tropicais ácidos, afetando o crescimento e a produtividade das culturas. Com o objetivo de avaliar a tolerância ao excesso de manganês em progênies de cafeeiros arábica (Coffea arabica L.), foi instalado um experimento fatorial 14 x 2 (14 progênies e 2 concentrações de manganês) no delineamento inteiramente ao acaso com três repetições. As mudas dos cafeeiros foram cultivadas durante sete meses em casa-de- vegetação, em solução nutritiva com 7,0 e 70,0 μmol L -1 de manganês. Avaliaram-se as características de crescimento e os teores de manganês em folhas apicais, folhas inferiores e folhas completamente expandidas. As progênies UFV 3880, Mundo Novo 12 CAS, H- 518-3-6-1 e H-518-2-10-14 foram as que apresentaram maior freqüência de redução das características de crescimento, demonstrando maior sensibilidade ao excesso de manganês em solução, enquanto as progênies UFV 6869 e H-337-13-3-10 não apresentaram redução em nenhuma das variáveis de crescimento avaliadas, sugerindo maior tolerância ao excesso do elemento. Teores foliares semelhantes de manganês nas folhas maduras podem representar toxidez para algumas progênies e, ao mesmo tempo, não afetar o crescimento de outras, ressaltando as diferenças genéticas existentes entre as progênies.