EFEITOS DE HERBICIDAS SOBRE O DESEMPENHO DE Panicum maximum ESTABELECIDO EM SOBRESSEMEADURA NA CULTURA DA SOJA

Abstract

The objective was to investigate the effects of the use of herbicides applied in preemergence in soybean crop and two sowing rates of BRS Zuri and BRS Tamani forages applied in soybean overseeding on pasture formation and quality. The plots were standardized with the size of 5x4 meters. The treatments used were constituted by four herbicides and two sowing rates, being the herbicide treatments applied in pre-emergence of soybean: diclosulam, sulfentrazone, S-metolachlor and in post-emergence glyphosate, while sowing rates were 5.0 and 10 kg ha-1 of viable pure seeds for both forages. Weed evaluations were carried out at soybean harvest and in the two forage standardization cuts, which were quantified and classified according to species. Soybean yield and forage yield were also performed along with chemical bromatological analysis. The results indicated the herbicides glyphosate+fluazifop, S-Metolachlor and Sulfentrazone as potential weed controllers in soybean crop. No significant effects were found when twice the seeding rate was used. For soybean yield there was no effect of herbicide, while for forage yield, for BRS Zuri, the herbicide Diclosulan caused less mass accumulation.