Decomposição da palhada de aveia em diferentes manejos da semeadura da cultura de verão e correção de acidez do solo no sistema de integração lavoura-pecuária

Abstract

The integration of crops with pastures brings benefits in terms of productivity gains and animal weight, adequate use of inputs, increase in soil organic matter, nutrient storage capacity and greater efficiency in the use of these nutrients. The objective of this work was to evaluate the oat dry matter decomposition rate in an oxisol, when subjected to different combinations between soil acidity corrective/conditioner and sowing methods of grain culture in a grazed and non-grazed area. The experiments were carried out in the municipality of Vitorino, Paraná. Two experiments were carried out, one in an area of black oat grazed in winter and the other in an area of ungrazed black oat, both organized in a bifactorial scheme (2 x 4) with split plots in a randomized block design with four replications. In the main plots, two sowing managements for the summer crop were allocated (sowing with double discs and sowing with furrower shanks); the subplots were composed of four different forms of correction/conditioning of the soil [uncorrected; recommended dose of lime (2000 kg ha-1); recommended dose of gypsum (1000 kg ha-1) and the mixture of limestone + gypsum], totaling 32 experimental units per experiment (2 x 4 x 4). The grazed black oat showed lower dry mass decomposition rate compared to the ungrazed black oat, regardless of the treatment. The rate of decomposition of the remaining dry mass of grazed black oat did not differ significantly between treatments. In general, the patejada black oats presented greater dry matter decomposition than the ungrazed black oats.