POTENCIAL DE USO DE ESPÉCIES DE COBERTURA E SISTEMAS DE CULTIVO SOBRE A INCIDÊNCIA DE PLANTAS DANINHAS

Abstract

The objective of this study was to evaluate the potential of the use of cover species and cultivation systems on the incidence of weeds, in order to recommend alternatives adapted to regional productive contexts. The experiment was conducted in the experimental area of the Escola Fazenda and the Laboratório Multiusuário de Ciências Naturais of the Instituto Federal Goiano - Campus Posse. The soil is classified as Quartzarenic Neosol, and the total area corresponded to 490 m², subdivided into three blocks of 164 m² each, composed of eight plots of 7.5 m², separated by corridors of 1.0 m. The design used was in randomized blocks (DBC), in a 4 × 2 factorial scheme, composed of four cultivars of legumes, three species of crotalaria: Crotalaria ochroleuca, C. spectabilis, C. breviflora and guandu bean (Cajanus cajan), associated with no-till and conventional planting systems. Evaluations of the variables number of plants, fresh mass of the aerial part (MFPA) and dry mass of the aerial part (MSPA) were evaluated. For the variables related to weeds, a significant difference was observed only for the number of weeds, showing no significant difference for heights, MFPA, MSPA, dry root mass (MSR) and fresh root mass (MFR). The results indicate that the no-till system was more efficient in weed management, highlighting Crotalaria ochroleuca for its higher biomass production. The association between this species and no-till is an efficient and sustainable alternative to the conditions of the Cerrado.