Effects of non-equidistant rates of N, P and K on leaf concentrations of these nutrients and on yield of corn (Zea mays L.)

Authors

  • Andre Martin Louis Neptune USP; E.S.A.Luiz de Queiroz; Departamento de Solos, Geología e Fertilizantes
  • Julio Nakagawa UNESP; Departamento de Ciencias do Solo,
  • Luiz Carlos Scotton SAGRA-Nordeste S.A.
  • Euclides A. de Souza UNESP; Faculdade de Ciências Agrárias e Veterinárias

DOI:

https://doi.org/10.1590/S0071-12761982000200018

Abstract

The experiments here in described were carried out in a podzolic soil, in the Sate of São Paulo, Brazil, with the double hybrid corn HD-6999 B. The aim of the work reported in this paper is to determine the critical N, P, K levels or percentages associated with the fertilizer rates that give the maximum yield and the maximum profit. To arrive at a critical nitrogen, phosphorus and potassium economical level in the corn leaf, it was calculated the maximum economical yield attainable under the conditions presented in this study by using the Mitscherlich and Pimentel Gomes and Malavolta equation. The foolowing results have been found: Rates of fertilizers (kg/ha): 228(N), 80(P2O5), 50(K2O) - 100(N), 253(P2O5), 50(K2O) - 100(N), 80(P205),61,7(K2O); Maximum economical corn yield (kg/ha): 11,000 - 6,877 - 9,252; Critical nutrients level: 3,27% N - 0,293% P - 2,07% K

Downloads

Download data is not yet available.

Downloads

Published

1982-01-01

Issue

Vol. 39 No. 2 (1982)

Section

nao definida

How to Cite

Neptune, A. M. L., Nakagawa, J., Scotton, L. C., & Souza, E. A. de. (1982). Effects of non-equidistant rates of N, P and K on leaf concentrations of these nutrients and on yield of corn (Zea mays L.) . Anais Da Escola Superior De Agricultura Luiz De Queiroz, 39(2), 917-941. https://doi.org/10.1590/S0071-12761982000200018