Habilidade competitiva de cultivares de feijoeiro com picão-preto

Abstract

The common bean, several are the abiotic and biotic factors that can affect the productivity and quality of grain. Among the biotic stresses, the interference caused by the weeds to infest the crop. In this context, it inserts the beggartick (Bidens pilosa) as one of the weeds that cause the most damage to the bean crop. Given the above objective with the study was to determine the competitive ability of beggartick to live with bean cultivars. The experiment was conducted in greenhouse belonging to the research group Sustainable Management of Agricultural Systems Federal University of South Border, Campus Erechim / RS. The treatments were arranged in a replacement series and consisted of five ratios of beans and beggartick competitive with culture: 100:0; 75:25; 50:50: 24:75 and 0:100, which corresponds to 40:0, 30:10, 20:20, 10:30 and 12:40 plants per pot. Beans were represented by cultivars (BRS Campeiro, IPR Uirapuru, SCS Predileto and BRS Supremo) competing with a biotype of B. pilosa and the competitor was beggartick. Competitive analysis was performed using diagrams applied to replacement experiments, more use of indices of relative competitiveness. The variables assessed at 40 days after emergence of the species were: number of trifoliate bean leaves and beggartick, plant height, stem diameter, leaf area and dry weight of shoots. There was competition for environmental resources among bean cultivars and beggartick, causing negative interference in the variables studied. BRS Campeiro and SCS Predileto had higher competitive ability than the IPR Uirapuru and the BRS Supremo to live with the beggartick.