Weeds management systems in soybean pre-planting

Abstract

     The study aimed to evaluate the efficiency and residual effect of herbicides, applied in management operations, in modalities “Apply-Plant” and “Anticipated Management” in soybean crop. The experimental design was randomized complete blocks with four repetitions in 8 x 2 factorial scheme, with eight herbicides associations (with flumioxazin, chlorimuron-ethyl and glyphosate) in two management systems. For “Anticipated Management” was conducted glyphosate application 20 days before sowing, with treatments being applied two days after planting. For “Apply-Plant” system, treatments were applied one day before crop sowing. It was evaluated the control efficiency and residual effect of herbicides over Euphorbia heterophylla, Amaranthus hybridus e Commelina benghalensis, besides plant height, stand and soybean yield. Results showed that “Anticipated Management” proportionate better weeds control than “Apply-Plant”, besides ensuring that soybean crop could be able to develop under better conditions, thus guaranteeing greater yield. Flumioxazin and chlorimuron presence was enough to ensure the closing canopy of crop without a post-emergency application.