Activity, Adsorption, and Lixiviation of Acetochlor in Soil under No Tillage and Conventional Tillage: Influence of Straw Coverage

Abstract

The activity of residual herbicides employed for weed control varies with adsorption, lixiviation. degradation, and biological transformation of these compounds in the soil. The purpose of this study was to evaluate the activity of the herbicide acetochlor (2-chloro-N-ethoxymethyi-6''ethylacet-o-toluidineJ in Typic 627 628 M. V. W. Ferri et al.Paleodult under no tillage and convenlional tillage. Field and laboratory experiments were carried out at the Universidade Federal do Rio Grande do Sul. Weed control with and without straw coverage, and adsorption and lixiviation of acetochlor, in soil wiih both tillage systems were evaluated. Adsorption and lixiviation processes were determined by high-performance liquid chromatography (HPLC) with UV detector. The coefficients K,i and K,,^. were higher in no-tillage soil, indicating a more effeclive acclochlor adsorption. The maximum concentration of acetochlor was found in a depth of 15-20cm. indicating a higher lixiviation in this soil. The acetochlor was more effective in weed control using conventional tillage when compared to no tillage. The straw coverage reduced the conlrol efliciency of the herbicide.

Herbicide resistance status of sourgrass

“…2023;41:e020230028 https://doi.org/10.51694/AdvWeedSci/2023;41:00024 Andrade, 2019). Acetochlor, a very long-chain fatty acid (VLCFA) inhibitor, is effective to control sourgrass in maize conventional tillage, but in no-tillage, exhibits high sorption in straw (Ferri et al, 2006). These herbicides are preferred because there are few or no cases of resistance registered in the country.…”

Comportamento do 14C-propisochlor no solo e eficácia no controle de plantas daninhas em função da adição de palhada

“…Os benefícios decorrentes da presença da cobertura na superfície do solo são enormes como o controle a erosão do solo, conservação da umidade e aumento da matéria orgânica e da biodiversidade (BOAHEN et al, 2007). No entanto, a retenção e a adsorção de herbicidas nos resíduos vegetais podem resultar em mudanças significativas no comportamento ambiental desses produtos (ALLETO et al, 2013;FERRI et al, 2007).…”