Two applications were made for phytosanitary management, the first of Priori Top® (200 g L-1 azoxystrobin + 125 g L-1 difenoconazole) at a dose of 0.3 L ha-1 to control powdery mildew (Erysiphe diffusa) during V5, and the second application of Kraft® (36.0 g L-1 abamectin) at the dose of 0.1 L ha-1 to control red spider mites (Tetranychus urticae) during V7. In both applications, the adjuvant Nimbus® (428 g L-1; mineral oil) was used at a dose of 0.5 L/100 L of spray.At the end of the crop cycle, 100 days after sowing, the plants were harvested and the number of nodes in the main stem (NNMS), as well as the physiological components of the yield: number of pods per plant (NPP), number of grains per pod (GPP), number of grains per plant (GPL), weight of a thousand grains (WTG), and grain mass per plant (GMP) were evaluated standardizing the moisture content in 13%.The assumption checking of the analysis of variance was done by the graphical analysis of the residues (Neter et al., 1990), along with the maximum F-Test for the homogeneity of the variances. With no transformations required, the data were submitted to the analysis of variance and regression analysis. The regression models were adjusted by relating the variables with the 2,4-D doses, choosing models with high R2, the significance of the parameters of the equation by the t-test, and biological logic. The Pearson correlations (p