QUALIDADE DE SEMENTES DE SOJA DESSECADAS COM DIFERENTES HERBICIDAS NOS ESTÁDIOS FENOLÓGICOS R7.1 E R7.3

Abstract

Brazil is the largest soybean producer in the world, and the production of seeds with high physiological quality is of great importance. One of the alternatives to avoid losses in seed quality is the use of desiccant herbicides, but with the ban on the use of Paraquat in Brazil, alternatives for pre-harvest desiccation of soybeans should be sought. Thus, the objective was to evaluate the effects on the quality of soybean seeds as a function of the use of different desiccant herbicides applied in R7.1 and R7.3. The desiccant herbicides used in the present work were Diquat, Ammonium Glufosinate, Carfentrazone-ethyl and Saflufenacil as they are the most used herbicides in Brazil, in addition to their associations Ammonium Glufosinate + Ethyl Carfentrazone, Diquat + Ethyl Carfentrazone and Magnesium Chloride + phosphoric acid which were also analyzed. The samples were received at the Seed Laboratory where their germination, emergence, emergence speed index and seedling length were evaluated. Among the analyzed herbicides, the best results were found with the desiccation performed by Magnesium Chloride + Phosphoric Acid, Diquat and Ammonium Glufosinate. The present study demonstrated that it is possible to anticipate the harvest through desiccation, obtaining high quality lots of soybean seeds, with the best physiological stage of application being R7.3.