Produtividade e composi o química do capim-Tifton 85 submetido a diferentes taxas de aplica o do percolado de resíduo sólido urbano Yield and chemical composition of Tifton 85 submitted to different rates of landfill leachate

Este trabalho foi realizado com o objetivo de avaliar o efeito da aplica o de diferentes taxas de percolado de resíduo sólido urbano (RSU) na produtividade e na composi o química da parte aérea do capim-Tifton 85 (Cynodon spp). O percolado foi aplicado nas taxas de 0 testemunha); 250; 500; 750 e 1.000 kg ha-1 d-1 de DBO5, durante 8 meses. No tratamento-testemunha, n o receptor do percolado, aplicou-se água da rede de abastecimento público, sendo a lamina de aplica o definida com base na Evapotranspira o de Referência (ETo). O experimento foi analisado no esquema de parcelas subdivididas, tendo nas parcelas cinco concentra es de DBO5, e nas subparcelas, os cortes, no delineamento em blocos casualizados, com quatro repeti es. Os dados foram submetidos à análise de regress o e variancia. Observou-se aumento na produtividade de matéria seca, nos teores de proteína bruta e nas concentra es de N, K, Na, Ca, Mg, Mn, Cd, Pb e Fe,na parte aérea do capim,com o aumento nas taxas de aplica o do percolado. As concentra es de N, P e Mn tenderam a decrescer com o número de cortes do capim; as de Cd, Pb e Fe tenderam à estabiliza o após o 2o ou 3o cortes; e as de Na tenderam a aumentar após o 3o corte. As concentra es de K, Ca e Mg ficaram instáveis. The issue of this study was to evaluate the effect of different rates of landfill leachate (LL) in productivity and chemical composition of Tifton 85 (Cynodon spp). The leachate was applied at rates of 0 (control), 250, 500, 750, 1,000 kg ha-1 d-1 of BOD5, for eight months. In the control treatment, not receiving the leachate, it was applied water from the public supply network being the water depth of application defined based on the Reference Evapotranspiration (ETo). The experiment was analyzed in a split plot, with five plots concentrations of BOD5 and the cuts the subplots in a randomized block design with four replications. The data were subjected to analysis of variance and regression. The dry matter yield, crude protein levels and concentrations of N, K, Na, Ca, Mg, Mn, Cd, Pb and Fe, in the aerial parts of the Tifton 85, increased with the application rates of the percolate. The concentration of N, P and Mn tended to decrease with the number of grass cuts; for Cd, Pb and Fe tended to stabilize after the 2nd or the 3rd cuts; and the Na increase after the 3rd cut. The K, Ca and Mg concentrations were unstable.