Interferência e nível de dano econômico de papuã em feijoeiro

Abstract

The identification of bean’s cultivars competitive ability and the level of economic damage (NDE) caused by the alexander grass (Urochloa plantaginea) becomes important for adoption of integrated management of this weed. Therefore, the purpose of this study was identify mathematical models to estimate the interference and determine the level of economic damage from weed infestations of beans. The treatments were composed of bean cultivars; IAC Imperador, IPR Curió, ANFC9, IAC Milênio, IPR Tangará, IPR Sabiá and BRS Pérola and 12 densities of alexander grass plants for each cultivar that varied from 0 to 560 plants m-2. To describe the relationship between the loss of productivity of bean grains and the explanatory variables, plant density, soil cover, leaf area and dry matter of aerial part, were used the rectangular hyperbola model. To estimate the NDE, grain yield, control cost, bean price and herbicide efficiency were used. Productivity’s losses of bean grains due to the interference of alexander grass can be estimated satisfactorily by rectangular hyperbola model. The economic damage level values vary from 1.1 to 15.7 plants m-2 of alexander grass. Bean’s cultivars ANFC9, IAC Milênio and IPR Tangará have greater competitive ability with alexander grass than the cultivars IAC Imperador, IPR Curió, IPR Sábia and BRS Pérola.