SELETIVIDADE DE HERBICIDAS PRÉ-EMERGENTES NA CULTURA DA SOJA.

Abstract

Soy production plays a very important role in the Brazilian economy, with Brazil being the largest producer and exporter of the oilseed in the world. Therefore, for productivity to always be higher after harvest, it is necessary to use technologies that will avoid possible losses. The application of phytosanitary products can combat several unwanted pests and diseases, which cause damage to producers. Chemical control is widely used to combat weeds that can compete with the crop and hinder its development. The present work aims to determine which pre-emergent herbicides have the best efficiency in controlling weeds, reducing interference by weed competition in soybean. Products with the trade name of Profit, Boral, Spider, Stone, Flumyzin and Zethamaxx were used. For the standard treatment, Glyphosate was used, and the control did not receive herbicide application. The variables efficiency, phytotoxicity, productivity and dry mass were evaluated. For efficiency, Sulfentrazone was highlighted in all evaluations, but this one also had high phytotoxicity averages. The treatments did not have statistical differentiation for productivity and dry mass, but it is possible to notice the highlight of Flumyzin, which had good efficiency, low phytotoxicity index, and higher average productivity. All products showed a higher amount of sc.ha-1 than the control, reaffirming the importance of using herbicides in soybean crops to combat weeds.