ESTRATÉGIAS PARA O MANEJO DE DESSECAÇÃO EM SOJA APÓS O BANIMENTO DO PARAQUATE

Abstract

Soy is an important global commodity, being one of the main agricultural products in Brazil. To obtain the grains, pre-harvest desiccation is necessary, which is a very important step in the soybean/corn succession process in the Brazilian Cerrado. Taking into account Resolution 177/2017 that provides for the prohibition of the active ingredient Paraquate, which corresponds to transitory risk mitigation measures. Given the facts, the objective was to evaluate the desiccation efficiency of 7 herbicides and the quality of the seeds. The experiment was conducted at the Center for Innovation and Technology of the Associated Research Group of Southwest Goiás (CIT GAPES), located in Rio Verde/GO, in DBC (randomized block design) with 18 treatments (7 herbicides) with different doses and 1 absolute control. The plots consisted of 6 rows of 5 meters in length, spaced 0.50m between rows and with a final population of 310,000 plants per hectare. The agronomic characteristics evaluated were: defoliation percentage, germination percentage, yield (productivity and moisture) and production in relation to the control treatment. For the comparison between the means of each treatment, the analysis of variance was used, the F test and compared to the Tukey test at 5% significance. Significant variations in the percentage of defoliation were observed, where the herbicides diquat and glufosinate ammonium are alternatives that can be used in pre-harvest desiccation, as a replacement for Paraquat, when dealing with the banning of this active principle.