Eficiência de herbicidas pré e pós-emergêntes na cultura da soja

Abstract

The incidence of weeds in a soybean crop still causes many losses in production, thus, the present study seeks to evaluate the different results in the application of herbicides in areas with weed incidence at different times, with pre-emergence applications in the “plant apply” system, and also, with the application of herbicides in the vegetative stages V4 and V8. The experiment was carried out in the municipality of Liberato Salzano-RS, in the 2021/2022 summer crop, evaluating the use of different herbicides applied in pre-emergence. The experimental design used was randomized blocks, with split plots and four replications. Different types of herbicides were tested: pyroxasulfone + flumioxazin, imazethapyr + flumioxazin, sulfentrazone + diuron, diclosulan and glyphosate; there was the association of some of these herbicides under application. Visual phytotoxicity was evaluated in the crop 45 days after emergence (DAE), along with visual control at 45 DAPe and at maturation, at 60 DAPe the dry mass of weeds (MSPD) was evaluated. plant height, productivity, number of pods and weight of a thousand seeds (PMS), the evaluations were submitted to Duncan's test at 5% of significance. Satisfactory results were obtained in terms of visual control, phytotoxicity and weed dry mass. Despite the climatic interference, some other results were observed, but with no difference in the statistical analysis.