Avaliação do efeito sazonal da composição morfológica e valor nutritivo da Brachiaria brizantha cv. BRS Piatã em sistemas integrados

Abstract

Brazil has a high level of animal protein production, with pasture being the main component of the Brazilian production system. However, diversification, territorial extension and low level of technology result in heterogeneity in forage production, generating low production rates and environmental impacts, such as pasture degradation. Given this scenario, the models of Integrated crop-livestock integration (ICL) and crop-livestock-forest integration (ICLF), which aim to intensify agricultural production, with environmental benefits and respect for the agroecosystem, have gained ground. The objective of this study was to evaluate the seasonal variation in the morphological composition and nutritional value of Brachiaria brizantha cv. BRS Piatã cultivated in a integrated crop-livestock-forest system, with a density of 89 trees/ha and a spatial arrangement of 28 m x 4 m, in a single row, and in an integrated crop-livestock system. The following variables were evaluated: plant height, soil cover, SPAD index, photosynthetically active radiation, in addition to the nutritional value by the parameters of crude protein, neutral detergent fiber, acid detergent fiber and in vitro digestibility of organic matter. Significant seasonal differences were observed between the systems, with better forage production in the crop-livestock integration system and better nutritional value of forage in the crop-livestock-forest integration system.