UTILIZAÇÃO DE BIOESTIMULANTE NA MITIGAÇÃO DE FITOINTOXICAÇÃO DE DICAMBA EM SOJA

Abstract

The application of the herbicide dicamba in genetically modified crops tolerant to auxinic herbicides has raised concerns, specifically in the case of drift for sensitive crops. This research aimed to evaluate the effects of the application of vegetable regulator on soybean crop after dicamba application. The experimental design was randomized blocks with four replications. Treatments consisted of dicamba application (28.8g ha-1) and subsequent application of Stimulate® vegetable regulator at doses of 250 and 500 mLha-1 at 1, 3, 5 and 7 days after dicamba application (DAA). and with reapplication (250 and 500 mLha-1) of the plant regulator at 7 days after the first application (RAP). Treated and untreated plots with dicamba and Stimulate® were tested. The application of dicamba was at the phenological stage V3 in soybean. Dicamba caused phytotoxicity in soybean and reduced shoot dry mass, plant and first pod insertion heights, number of grains per plant, yield and one thousand grain weight in relation to non-dicamba treated plots. The plant regulator, after dicamba application, regardless of the season and dose applied, does not reduce injuries and does not mitigate the adverse effects of herbicide on soybean yield.