Associação de herbicidas para dessecação de Conyza Bonariensis e o efeito nos componentes de rendimento da soja

Abstract

The objective of this study was to evaluate the efficacy of herbicides in combination and isolates for desiccation and management of soybean yield components. The design was randomized blocks with four replications and 14 treatments. The herbicides used were: glyphosate (3.0 L ha), 2,4-D (1.5 L ha), glyphosate + sulfentrazone (3.0 + 0.6 L ha), glyphosate + metsulfuron-methyl (3.0 + 2.0 L ha-1), glyphosate + saflufenacil (3.0 L ha -1 + 30 g ha), glyphosate + 2,4-D (3.0 + 1.5 L ha), glyphosate + flumioxazin (3.0 L ha + 45 g ha), glyphosate + chlorimuron-ethyl (3.0 L ha + 20 g ha), glyphosate + diclosulam (3, 0 L ha-1 + 35 g ha), paraquat (1.5 L ha), glufosinate (2.5 L ha), paraquat + diuron (1.0 L ha), saflufenacil ( 30 g ha) and control without herbicide. Control was evaluated at 14 and 28 days after application of treatments, and before harvest the yield components of BMX Elite IPRO were determined. The treatments with the best results were ammonium glufosinate and glyphosate + saflufenacil at 14 and 28 days, and also showing significant results for the number of pods per plant and number of grains per plant. The yield components number of grains per pod, mass of one thousand grains and grain yield did not differ when using the evaluated treatments. The desiccation of the area before sowing and the mixing of different mechanisms of action, result in a greater efficiency in the control of the grain, thus achieving high soybean grain yields