Inoculação de Azospirillum brasilens em diferentes doses de nitrogênio do cultivo da Brachiaria brizantha cv. Marandu

Abstract

This study aimed to evaluate the dry matter yield, green mass and leaf nutrient content of Brachiaria brizantha cv. Marandu, under different doses of nitrogen fertilizer using Nitrate and Ammonium inoculant (Azospirillum brasilense). The experiment was conducted at the Bonsucesso farm, Uberlândia - MG. The experimental design was a randomized block with treatments distributed in a factorial 3 x 2, with four repetitions. The plots constituted 25 m2 each. The first factor corresponded to nitrogen rates (0, 100 and 200 kg ha-1 ), and second, the concentration of inoculant based on Azospirillum (0 and 300 mL ha-1 ) and the application was performed on established pasture more than three years with Brachiaria brizantha cv. Marandu. the experiment was carried out on pasture and remained an average height of 20 cm. green mass and dry matter of Brachiaria were evaluated. The use of Azospirillum promotes dry matter production and increased green mass when used in conjunction with nitrogen. The best responses were obtained when the application of Azospirillum occurred together with the additional nitrogen dose, significant gains when compared to treatment with nitrogenous fertilizer only. The use of Azospirillum associated with the intermediate dose of nitrogen (100 kg/ha) brought significantly greater responses to the same nitrogen dose applied alone. The form of application of Azospirillum surface in established pastures provided the dry mass and increase green mass in consortium with additional nitrogen doses.