This study evaluated the application of increasing doses (0, 10, 21 and 84 Mg ha-1) of the dried bovine rumen residue (BRR) (90.00% DM) or wet (7.16% DM) with nitrogen content (N) of 1.43% in the DM, considering that only 33% of N of the BRR would be available to meet the requirement of Urochloa brizantha cv. Xaraés of 0, 50, 100 and 400 kg N ha-1, on the fertility of an Oxisol (pH in water, exchangeable cations, P, N and organic matter) after 30 days of organic fertilization and on the production of dry biomass (BIO), height, levels of nitrogen (N) and crude protein (CP) after 60 and 120 days of cultivation of the Xaraés. A completely randomized design was used in 4 x 2 factorial (four doses of fertilizer BRR and two conditions of RRB dry matter) with three replications. The application of increasing doses of dry or wet BRR increased linearly (p < 0.05) the levels of N, P, K and organic matter of soil. Different doses of dry or wet BRR increased linearly (p <0.05) the dry BIO, the contents of N and CP of the grass Xaraés after 60 days of cultivation, but a quadratic effect (p < 0.05) was verified for the contents of N and CP of the grass Xaraés after 120 days of cultivation. Thus, the Urochloa brizantha cv. Xaraés presented higher production of dry BIO, regardless of the harvest period and the condition of the DM of BRR at the application time.
Brachiaria brizantha; nutrient cycling; environmental management; Urochloa brizantha
