Sistemas de controle químico de capim pé-de-galinha na soja

Abstract

Soybean crop can be negatively affected by competing with weeds, which can reduce yield. This trial aimed to evaluate different alternatives for the control of goosegrass in soybean crop. Two experiments were conducted with the same treatments at different times, with the purpose of evaluating the efficiency of herbicides applied in the preemergence of soybean and goosegrass, and post-emergence glyphosate applications in two different moments, first at 21 days after the emergency and 28 days after the emergency. The location of the field trial was at Monsanto experimental station in Sorriso/MT in the 2018/2019 season, the central location of the station is S 12 ° 25 '39.2 "and W 55 ° 38' 16.3". The experimental design was completely randomized blocks with 10 treatments and 4 replications. Visual assessments of control percentage were performed at 14 days after herbicide applications and at pre-harvest. The weed infestation rate was evaluated at 28 days after the last application after crop emergence and preharvest. The first trial demonstrated high infestation, and effective control with herbicides sprayed in preemergence combined with post-emergence application, allowing more flexibility of post-emergence application. In the second trial, it represented a scenario of low infestation and with different germination moments of the goosegrass, without weed interference on yield.