NITROGÊNIO EM SISTEMA DE INTEGRAÇÃO LAVOURA E PECUÁRIA E SEUS EFEITOS NOS COMPONENTES DE RENDIMENTOS E TEORES DE NUTRIENTES NA CULTURA DO MILHO

Abstract

The corn crop (Zea mays Lam.) In the summer, in succession to oat pastures (Avena spp.) And Italian ryegrass (Lolium multiflorum Lam.) Fertilized with nitrogen in winter, is an alternative for land use optimization in the South of Brazil. Nitrogen fertilization increases the yield of the corn crop and pasture production. The objective was to evaluate the influence of sheep grazing and the residual effect of nitrogen applied on grassland and maize, as well as analyzing their effects on grain production in a crop-livestock integration system, and verify the interaction N with the nutrients in the plant and present in the grain protein content. To this end, the experiment was conducted in the years 2013 and 2014, in Guarapuava-PR, with the rotation of pasture of oat / ryegrass - corn. The experimental design was randomized blocks with split plots and three replications. The main plot consisted of N rates applied on grassland (0, 75, 150 and 225 kg ha-1 N), the subplots with and without grazing and the subsubplots doses of N (0, 75, 150, 225 and 300 kg ha -1) applied in maize in succession to pasture. Grain yield was not affected by grazing animals. It was found that the N applied on grassland influenced the yield of corn grain, showing the residual effect of this nutrient. Grain yield was not affected by grazing animals. Content of protein and nitrogen in leaves was increased in relation to increased nitrogen levels. With the added doses of N was higher concentration of N, Mg, Fe and Mg in the leaves.