Faixas críticas de teores foliares de macro e micronutrientes no cafeeiro (Coffea arabica L.) no primeiro ano de formação da lavoura

• Ano de defesa: 2005
• Autor(a) principal: Clemente, Flávia Maria Vieira Teixeira
• Orientador(a): Guimarães, Rubens José
• Banca de defesa: Mendes, Antônio Nazareno Guimarães
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: UNIVERSIDADE FEDERAL DE LAVRAS
• Programa de Pós-Graduação: DAG - Departamento de Agricultura
• País: BRASIL
• Palavras-chave em Português: Café; Nutrientes; Primeiro ano; Coffee; Nutritious; First year
• Área do conhecimento CNPq: CNPQ_NÃO_INFORMADO
• Link de acesso: https://repositorio.ufla.br/handle/1/4278

The experiment was carried out at the Department of Agriculture, Federal University of Lavras, Lavras, MG, to evaluate the foliar levels of macro and micronutrients in coffee plants in its first year of growth, defining the critical ranges. In a greenhouse, the plants were placed according to block design with six treatments (fertilizer levels), T1-25%, T2-50%, T3-75%, T4-100%, T5-125% and T6-150% of standard fertilization. For that, four blocks were used, in a total of 24 plots. The parameters evaluated were growing pattern (plant height, in cm, stem diameter, in mm, foliar area index, in dm2.Kg-1, length of plagiotropic branches, in cm, and number of plagiotropic branches). The measurements were taken every 60 days. Also, other measurements were taken by the end of the experiment, such as chemical foliar analysis for macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium, sulfur) and for micronutrients (boro, zinc, copper, manganese and iron), and dry weight (g) of roots, stems, and leaves of plants. For each characteristic, it was calculated the maximum growth level in the last 12 months, as well as the fertilizer level, corresponding to 90% of it. Based on these fertilizer levels, it was searched for correlation of these values with macro and micronutrients in the dried matter of leaves. The critical ranges for foliar macro and micronutrient levels were found in the plants, nitrogen (19.24 to 23.16 g/Kg), phosphorus (1.14 to 1.21 g/Kg), potassium (17.39 to 19.02 g/Kg), calcium (12.70 to 14.11 g/Kg), magnesium (8.26 to 8.97 g/Kg), sulfur (1.49 to 1.77 g/Kg), boro (12.42 to 18.54 mg/Kg), zinc (11.51 to 11.92 mg/Kg), copper (12.40 to 18.54 mg/Kg), iron (424.89 to 457.31 mg/Kg), and manganese (127.17 to 178.67 mg/Kg). It was demonstrated that 71 - 112,25% fertilization, had better plant development.