Adubação de milho no município de Oliveira, estado de Minas Gerais

Abstract

The present paper is related to a factorial experiment 2³ on corn fertilization carried out in the Municipality of Oliveira, State of Minas Gerais, Brazil. It has been found that the grain yield of the different treatments was: Control - 3.053 Kg/ha N only - 5.126 Kg/ha N K - 5.244 Kg/ha N P K - 5.937 Kg/ha HP - 6.046 Kg/ha Ascording to the results, it can be inferred that the most economical yield was obtained with the application of nitrogen. There was a small increase in the yield with phosphorus and there was no response to potassium. The soil analysis shoved a high phosphorus content (0,618 e.mg/100 g of soil). The phosphorus extraction was nade with H2SO4 0,05 N. In respect to exchangeable potassium, its content was 0,150 e.mg/100 g of soil; the extractor for potassium was HNO3 0,05 N. Concerning the soil nitrogen, the Kjeldahl method showed a percentage of total nitrogen of 0.154. In spite of this nitrogen content, the corn responds to nitrogen fertilization.