APLICAÇÃO DE 2,4-D SAL COLINA, GLUFOSINATO DE AMÔNIO E GLIFOSATO, EM DIFERENTES DOSES, EM UMA CULTIVAR DE SOJA COM A BIOTECNOLOGIA ENLIST E3®

Abstract

This study aimed to evaluate the agronomic performance of Enlist E3 ® soybean following post-emergence applications of the herbicides 2,4-D (684, 1,368, and 2,736 g a.e. ha⁻¹), glufosinate ammonium (300, 600, and 1,200 g a.i. ha⁻¹), and glyphosate (750, 1,500, and 3,000 g a.e. ha⁻¹), applied individually and in mixtures. The experiment was conducted in Rio Verde-Go in a randomized block desing with 22 treatments and 4 replications. Applications were made at the V4 stage and included double, triple mixtures, and a hand-weeded control. Parameters evaluated included plant height, number of pods, thousand grain weight, yield, and herbicide selectivity. Enlist E3® soybeans exhibited tolerance to all herbicides, even at high rates and in mixtures, with minimal impact on agronomic traits. A temporary reduction in plant height was observed 10 days after application but was not significant during the reproductive stage. High rates of glyphosate and glufosinate, alone or mixed with 2,4-D, significantly reduced the number of nodes per plant. Phytotoxic symptoms ranged from mild to moderate but did not affect final yield.