Effect of dosage and times of application of glyphosate on yield and qualitative in soybean RR

Abstract

The objective was to evaluate the effects of glyphosate on attribute yield and quality physiological of soybean seeds of the variety BRS Valiosa RR at different dosages and times of application of glyphosate. The treatments were: control (without application of glyphosate); 540+540+0; 1080+0+0; 1080+1080+0; 2160+0+0; 0+1080+0; 0+2160+0; 540+540+1080; 540+540+2160 g a.i.ha^-1 of the glyphosate applied respectively in stadiums of the fully developed leaf at second trifoliate node and third trifoliate leaf developing (V₃/V₄), fully developed leaf at seventh trifoliate node (V₈) and at the beginning of seed maturation (R₇). The experimental design was arranged in complete randomized blocks with four replicates of each treatment. The results were analyzed by performing the analysis of variance and Tukey test at 5% probability. From the results obtained it is conclude that the different doses of glyphosate (540, 1080 e 2160 g a.i.ha^-1 of the glyphosate) applied at different times (V₃/V₄, V₈ e R₇) does not change productive and qualitative attributes of seeds, except number of pods per plant and primary root length in the dose 2160 g a.i.ha^-1 of the glyphosate at V₈.