TESTES DE HERBICIDAS PRÉ-EMERGENTES E EFICIÊNCIA NO CONTROLE DE PLANTAS DANINHAS NO CULTIVO DA SOJA

Abstract

To evaluate pre-emergent herbicides in the control of weeds in the soybean harvest, a field test was carried out in the experimental area of the Instituto Federal Goiano - Campus Urutaí during the year 2019-2020. The experiment was arranged in a randomized block design (DBC), with a factorial arrangement with four replications. In the experiment, weeded and non-weeded controls were included as treatments, and treatments testing five doses, which 25%, 50%, 75%, 100% and 200% for each product (Boral, Zethamaxx, Spider and Dual Gold. The Boral, Zethamaxx and Spider treatments showed satisfactory results with 80% of the above controls, for every day of evaluation at the doses of 75%, 100% and 200%. Compared to the package insert dose, Zethamaxx and Spider presented control results. The Zethamaxx herbicide stands out as the one with the best values, being the best treatment to control weeds. However, when double dosages of the package insert were used, they resulted in phytotoxicity to the culture. The Spider treatment at all doses tested showed visual damage in the aerial part of the plants initially. For the treatments Zethamaxx, Spider and Dual Gold at 28 DAA at the 100% dose, they presented satisfactory results with less poisoning to the crop. No statistical effect was observed for the stands of plants evaluated at 28 DAA, and also for dry mass and plant height at 28 DAA.