Resposta do milho segunda safra à aplicação de gesso agrícola

Abstract

Phosphogypsun has been used to correct sodic soils, mitigate the toxic effects of exchangeable aluminum and provide the percolation of calcium, potassium and magnesium at deeper soil layers, add calcium and sulfur, improve soil conditions. development of the root system of crops and consequently increase productivity. Despite these attributes, plaster has not shown significant productivity responses in some studies. The aim of this study was to evaluate the effects of increasing doses of Phosphogypsun applied near sowing, on yield, yield components, morphological characters and concentration of leaf N, P and K in the off-season corn crop in a Latossolo Vermelho distrófico típico (Oxisol) of clay texture. The experimental design was randomized blocks with five doses of Phosphogypsun: 0, 2, 4, 6 and 8 Mg ha-1 and with four replications. The following evaluations were made: plant height (AH), ear insertion height (EIH), stem diameter (SD), number of grains per corn cob (NGE), one thousand grain weight (OGW), grain yield (GY) and absorption of nutrients N, P and K leaf. Phosphogypsun application two days before sowing did not influence significantly any of the evaluated items of maize cultivated during the off-season, and under normal rainfall conditions.