Biblioteca do Café
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1
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Item Alternative sources of potassium in coffee plants for better soil fertility, productivity, and beverage quality(Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2018-12) Dias, Kaio Gonçalves de Lima; Guimarães, Paulo Tácito Gontijo; Carmo, Davi Lopes do; Reis, Thiago Henrique Pereira; Lacerda, Julian Junio de JesusThe objective of this work was to evaluate alternative sources of potassium for improving soil fertility and coffee productivity and beverage quality. The experiment was conducted in a coffee (Coffea arabica) crop, planted in an Oxisol area, in the municipality of Patrocínio, in the state of Minas Gerais, Brazil. The treatments consisted of the K sources TK47 and Super Greensand (SG) – both based on glauconite silicate mineral –, at the following doses: 0 kg ha-1K2O (control); 42, 84, 168, and 336 kg ha-1K2O from TK47; 618 kg ha-1K2O from KCl; and 168 kg ha-1K2O from SG. A randomized complete block design was used, with four replicates in each treatment. The experimental units consisted of three rows with ten plants each, using the eight central plants as the useful plot. Potassium fertilization with TK47 increased soil fertility, correcting soil acidity and elevating K + , P, and Ca 2+ contents, effective cation exchange capacity, and Zn 2+ and Fe 2+ levels in the soil. Fertilization with 336 kg ha-1K2O from TK47, in a single dose, provides grain yield and polyphenol oxidase activity similar to those of fertilization with 618 kg ha-1K2O from KCl, in a split-dose, but a better sensory analysis of the resultant beverage.Item Coffee yield and phosphate nutrition provided to plants by varius phosphorus sources and levels(Editora UFLA, 2015-03) Dias, Kaio Gonçalves de Lima; Furtini Neto, Antônio Eduardo; Guimarães, Paulo Tácito Gontijo; Reis, Thiago Henrique Pereira; Oliveira, Cesar Henrique Caputo dePhosphorus (P) is considered one of the nutrients that most limits crop yields, especially in soils with an advanced degree of weathering. To evaluate P dynamics and availability in soil resulting from various P doses and sources and to assess the resulting P content of coffee leaves and the final coffee yield, an experiment was conducted in the municipality of Três Pontas, MG, Brazil, in a Red Argisol (Ultisol) area. Fertilization, except for P fertilization, was performed based on the soil analysis results. The annual P doses tested were 0, 75, 150, 300, 450 and 600 kg ha-1 P2O5. Two P sources, simple superphosphate and magnesium thermal phosphate, were evaluated and compared in the study. A physicochemical analysis of the soil and an analysis of leaf dry matter were performed. The available P content in the soil increased as a result of the applications of the two sources. The leaf P levels stabilized at approximately 1.8 and 1.9 g kg -1 for simple superphosphate and magnesium thermal phosphate, respectively, as a result of the application of approximately 300 kg ha-1 P2O5 . The coffee responded to P fertilization in the production phase. Averaged over three harvests, the yield per harvest showed gains of 45.3% and 40.3% for simple superphosphate and magnesium thermal phosphate, respectively, with the application of the highest studied dose, 600 kg ha-1 P2O5.Item Teores foliares de fósforo em cafeeiros adultos submetidos à aplicação de elevadas doses deste nutriente(Embrapa Café, 2013) Dias, Kaio Gonçalves de Lima; Guimarães, Paulo Tácito Gontijo; Furtini Neto, Antônio Eduardo; Pereira Reis, Tthiago Henrique; Oliveira, Cesar Henrique Caputo de; Figueiredo, Vanessa CastroO estudo do fósforo (P) consiste num dos maiores desafios relacionados à nutrição de plantas, principalmente em solos que apresentam avançado grau de intemperismo, como a maioria dos solos brasileiros. Com objetivo de avaliar os efeitos da adubação de manutenção com doses anuais crescentes de P2O5 como superfosfato simples e termofosfato magnesiano nos teores foliares de P em cafeeiros adultos no Sul de Minas Gerais, foi instalado um experimento no município de Três Pontas – MG, em um Argissolo Vermelho da Fazenda Experimental da EPAMIG, com a cultivar Catiguá MG-2, no espaçamento de 3,60 x 0,60m. As adubações foram realizadas levando em consideração os resultados das análises de solo, exceto para o nutriente fósforo. As doses testadas foram 0, 75, 150, 300, 450 e 600 kg ha-1 de P2O5 e as fontes utilizadas foram o superfosfato simples e o termofosfato magnesiano. Os teores foliares de P se elevaram com a aplicação de P no solo para as duas fontes testadas, tendendo a se estabilizarem em torno de 1,8 – 1,9 g kg-1. O cafeeiro mostrou-se responsivo a aplicação de P na adubação de manutenção.