FAIXAS CRÃTICAS DE TEORES FOLIARES DE MACRO E MICRONUTRIENTES NO CAFEEIRO (Coffea arabica L.) NO PRIMEIRO ANO DE FORMAÃÃO DA LAVOURA / Critical ranges of macro and micronutrient leaf levels in coffee (Coffee arabica L.) in first year of the formation phase.

AUTOR(ES)

FlÃvia Maria Teixeira Clemente

DATA DE PUBLICAÇÃO

2005

RESUMO

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 â 112,25% fertilization, had better plant development.

ASSUNTO(S)

coffee,nutritious,first year nutriente cafà fitotecnia primeiro ano.

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