Efeitos de tipos de preparo do solo e uso de gesso agrícola sobre as características químicas e produtividade de milho e braquiária em cultivo consorciado

Abstract

This work had as objective to evaluate the effects of two farming systems, associated to the use of agricultural gypsum over the soil chemical characteristics and the development of corn crop consorted with braquiaria, perfecting integration models. The experiment was conducted in degraded pasture area in Yelow Red Latossoil with low fertility. The experimental design was randomized complete blocks, combining two farming systems (no-tillage and conventional cultivation), with or without gypsum use, and five replications. Soil chemical characteristics were appraised, in 0-20 and 20-40 cm of depths, grains yield and of fodder crop, as well as weeds incidences. The notillage provideds increases in soil phosphorus and organic matter contents (surface and in depth) and in the sulphur content in the surface, however these facts were not enough to guarantee larger grains yield in relation to the conventional management. Conventional management assured larger stand and better corn plant development, resulting in larger grains yield in relation to the no-tillage. Fodder yield and weeds control were benefitted by the soil minimum turning over proportionate by the notillage, indicating to be technically viable for crop-livestock interaction and weeds integrated management. Gypsum use reduced the aluminum contents and increased the soil sulphur values in the depth of 20-40 cm, influencing positively the grains yield.