EFEITOS DE RESÍDUOS VEGETAIS E DE HERBICIDAS SOBRE AS PLANTAS DANINHAS E A PRODUÇÃO DO FEIJOEIRO-COMUM

Abstract

This study aimed to evaluate the occurrence of weeds and the performance of common bean grown on different types of plant residues managed with herbicides, in a no-till system. The treatments were arranged in split plots in a randomized block design with three replications. Prior to sowing common bean in the no-till system, plant residues of sorghum, maize, jack bean, sunflower, stylosanthes, rice, soybean and weeds were spread on the plots. Common bean was sown after chemical drying of the cover species. The two secondary treatments in split plots after bean sowing consisted of herbicide absence and the use of a mixture of the herbicides fomesafen (applied at a rate of 100 g ha-1 , 20 days after bean emergence-DAE) and quizalofop-p-ethyl (applied at a rate of 70 g ha-1, 25 DAE). Sorghum produced highest amounts of straw as well as the best soil cover. The plant residues did not influence the establishment of common bean. Herbicide application controlled weeds efficiently. However, the effects of mulch on weed control did not influence bean yield. The treatments influenced the number of pods per plant and grain yield of the bean yield components, with higher values in herbicide-treated plots.