EFFECT OF APPLYING MIXED ORGANOMINERAL FERTILIZER AS A BIOSTIMULANT ON SOYBEAN YIELD

Although soybean is economically one of the main agricultural products in the national and world scenario, it is still needed to increase its grain yield. Therefore, this study aimed to evaluate the effect of applying mixed organomineral fertilizer (OMF) at different doses and at two phenological stages on soybean yield. The experiment was conducted in the experimental area of the Federal University of Jataí, in the state of Goiás, and was installed under a no-till system (NTS). The experimental design used was randomized blocks arranged in a 4 x 2 + 1 factorial scheme, consisting of four doses of OMF, applied at two phenological stages and one additional control. The following OMF doses were evaluated: 0.5 kg ha-1, 1 kg ha-1, 1.5 kg ha-1, and 2 kg ha-1, at two reproductive stages: R3 and R5, and the additional control. The experiment consisted of three blocks. Each plot had a useful area of 16.2 m². The agronomic parameters assessed were plant height (m), first pod insertion height (m), number of pods per plant, number of grains per pod, 1000-grain mass (g), and grain yield (kg ha-1). The application of OMF as a biostimulant to soybean crops led to an increase in the first pod insertion height and the number of pods per plant; it did not lead to higher yields; however, when applied at phenological stage R5, higher yields were observed compared to application at R3.