EFEITO DE HERBICIDAS APLICADOS EM PRÉ-EMERGÊNCIA NO RENDIMENTO DE SOJA E CONTROLE DE PLANTAS DANINHAS

Abstract

In recent years, the management of difficult-to-control weeds in soybean crops has become crucial to ensuring high productivity. The objective was to evaluate the effect of using pre-emergence herbicides during desiccation on the efficiency of weed control and yield of the HO Guapó I2x soybean cultivar. Tested in cazualid blocks, with four replications, eight treatments: T1 - Glyphosate (1440 g ae ha-1); T2 - Glyphosate (1440 g e.a. ha-1)+Sulfentrazone (360 g a.i. ha-1)+Imazetapyr (96 g a.i. ha-1); T3 - Glyphosate (1440 g e.a. ha-1)+Sulfentrazone (150 g a.i. ha-1); T4 - Glyphosate (1440 g e.a. ha-1)+Flumioxazine (75 g a.i. ha-1); T5 - Glyphosate (1440 g e.a. ha-1)+Pyroxasulfone (105 g a.i. ha-1)+Flumioxazine (70 g a.i. ha-1); T6 - Glyphosate (1440 g e.a. ha-1)+2-4,D (680 g a.i. ha-1). Control efficiency, phytotoxicity and soybean productivity were evaluated. Coexistence with weeds reduces soybean grain yield and herbicides are efficient in reducing interference. The use of Glyphosate+ Sulfentrazone and Glyphosate+Pyroxasulfone+Flumioxazine provide superior performance in grain production compared to other herbicide treatments.