Desempenho agronômico do capim Urochloa brizantha cv. Xaraés submetido às fontes nitrogenadas nos períodos chuvoso e seco na Amazônia oriental.

Abstract

The study aimed to assess the agronomic performance of Urochloa brizantha cv. Xaraés under foliar applications of nitrogen, amino acids, and their combination with Azospirillum brasilense. It also sought to determine the feasibility of substituting nitrogen with these substances in the southern region of Pará. The research took place in Redenção – PA, during both the rainy and dry seasons, commencing in October 2022. The experimental design employed was a completely randomized design (CRD), with treatments administered foliarly: Control Treatment; Nitrogen; Nitrogen + Azospirillum brasilense; Amino acids; Amino acids + Azospirillum brasilense, each with 4 replications. Assessments were conducted based on management height (40 cm), residue height (15 cm), chlorophyll content (%), regrowth rate (cm day-1), morphological composition, productivity (kg ha-1), nutritional elements, and in vitro digestibility (%). Utilizing amino acids and Azospirillum brasilense in management proved most effective across various parameters, particularly in enhancing productivity, crude protein (CP), and in vitro digestibility. In conclusion, implementing management practices involving foliar application of amino acids and Azospirillum brasilense can serve as a viable option to substitute nitrogen application, thereby optimizing the agronomic performance of Urochloa brizantha cv. Xaraés and promoting more sustainable and productive animal production.