Diagnóstico nutricional do cafeeiro por meio da análise de flores, folhas e extrato foliar

• Ano de defesa: 2010
• Autor(a) principal: Zabini, André Vinicius
• Orientador(a): Martinez, Hermínia Emília Prieto
• Banca de defesa: Lima, Paulo César de , Sakiyama, Ney Sussumu
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Macronutrientes; Micronutrientes; Diagnose foliar
• Palavras-chave em Inglês: Macronutrients; Micronutrients; Foliar diagnosis
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1150

The objectives of this work were to evaluate alternative techniques for nutritional diagnosis of coffee plants. The work was divided into three experiments and the first experiment aimed to evaluate the technique of rapid foliar potassium using ion meter card. Coffee seedlings were grown in a greenhouse for ten months in a completely randomized design with four replications and treatments were doses of K (50, 150, 300, 450 and 600 mg dm-3). Were evaluated the growth characteristics, foliar concentrations of macro and micronutrients and K content in leaf extracts with specific ion meter. There was a reduction of the growth characteristics with increasing doses of K. The provision of K reduced the absorption of Ca, Mg, Zn and Mn. The K content in leaf extracts determined with the portable meter card was correlated with the K in total dry matter. The second experiment studied the nutrient uptake by the flower buds and leaves of coffee grown in irrigated systems and no-irrigated. The test was conducted on a commercial farm located in Alfenas, MG, in the period of 34 days between the prebloom and full bloom of coffee plants. We collected flower buds and flowers at nine times during the driving test for determination of dry matter contents and macronutrients. The results showed that the growth of flower buds and anthesis date were not affected by irrigation. The content of macronutrients in leaves or flower buds have not changed during the trial and did not differ between plants grown under irrigated system or no-irrigated. The increase of dry matter and macronutrient content in flower buds was linear and did not differ between plants with and without irrigation. The third experiment studied the mineral composition of flowers in different positions of the coffee branch, studied the relationship between nutrient contents in leaves and flowers and to correlate these contents with the production of coffee, and estimated the critical ranges of nutrients in leaves and flowers coffee. The concentrations of nutrients in flowers and leaves and productivity of coffee in 26 commercial crops in the region of Manhuaçu Brazil, during three years, alone among the farms of high and low productivity, 13 per crop productivity level. It was observed that nutrient contents in flowers do not differ between the first and sixth floral rosette from the apex of the coffee branch. Coffee plantations of high and low productivity level did not differ as to the nutritional status of plants at the time of flowering. The nutrient content is better correlated with the productivity of coffee. The analysis of flowers proved to be a technique sensitive to changes in nutritional status of coffee in agreement with the leaf analysis but not for all nutrients, suggesting that both techniques should be considered in a complementary manner.