Dessecação de pastagem degradada e aplicação de resíduo de aviário para semeadura de primeiro cultivo de soja

Abstract

Soybean is one of the most important agricultural crops in the world economy, it is considered one of the main responsible for the introduction of the concept of agribusiness in Brazil. However, the crop is not always implanted in soils with ideal physical and microbiological conditions. The application of a material rich in microorganisms, such as poultry waste, can benefit the crop. The objective of this research was to evaluate the impact of pasture desiccation times with and without the application of poultry manure on the physical and microbiological properties of the soil and on the productivity of the soybean crop. The experiment was carried out at in Presidente Bernardes-SP. The experiment was carried out in a factorial system in randomized blocks with subdivided plots. The first order experimental factor was the time of drying the pasture in five stages (180, 150, 120, 90 and 60 DAS (days before sowing) for the 16/17 and 160, 130, 100, 70 and 40 DAS seasons for the 17/18 harvest). The sub-plots were composed by the absence and application of poultry manure (0 and 2,500 kg ha-1 of poultry manure). Soil physical and biological attributes and soybean productivity were evaluated. Pasture desiccated at 90 DAS before soybean sowing provided improvements in soil physics and biology. The application of poultry litter after desiccation, accelerates the decomposition of the straw, however it did not increase the productivity of the soybean crop.