SUCESSÃO DE FORRAGEIRAS EM SISTEMAS DE INTEGRAÇÃO LAVOURA-PECUÁRIA E MILHO NA SEGUNDA SAFRA

Abstract

Among the crop-livestock integration systems, the succession of forages is an advantageous strategy to use the pasture to feed cattle in the low precipitation period, as well as for biomass formation at no-tillage system in the subsequent harvest. Different species have a different capacity to accumulate nutrients in the biomass, releasing in the soil through the decomposition of cultural residues. Thus, the objective was to evaluate the biomass production, nutrients accumulation and soybean productivity in the biomass of Paiaguas palisadegrass and Tamani guinea grass in crop-livestock and corn integration systems in the second harvest. The experiment was carried out in a randomized block design with four replications. The treatments consisted of three cultivation systems: livestock farming integration with Paiaguas palisadegrass (Brachiaria brizantha cv. BRS Paiaguás); livestock crop integration with Tamani guinea grass (Panicum maximum cv. BRS Tamani); and corn in succession to soybean. The results showed that the use of crop-livestock integration system in the form of forage succession provided greater soil coverage and nutrient cycling compared to the cultivation of corn in succession, which resulted in higher soybean productivity, thus contributing to the agricultural sustainability. The Paiaguas palisade grass and Tamani guinea grass showed a C:N ratio greater than 30:1, indicating slow decomposition of plant residues. Forages accumulated in their biomass quantities of nutrients that met the demand for soy resulting in higher grain productivity.