Pyridoxine acts as a booster of gas exchange and soybean production components

The use of biostimulant compounds in agriculture has helped producers obtain better results by stimulating vegetative and reproductive development and circumvent some of the effects of climate change, such as periods of water stress and heat waves. In this sense, B vitamins have been studied to promote beneficial effects, whether biostimulant or bioprotective, on species of agricultural interest. This study aimed to evaluate the effects of exogenous application of pyridoxine on the development and grain yield of the soybean (Glycine max L.) crop, indicating the potential use of the vitamin to improve the crop. Two cycles were conducted, with treatments consisting of different doses of pyridoxine (0, 20, 40, 60, and 80 g ha⁻¹). Gas exchange, vegetative growth, and production characteristics were evaluated. Among the main results were an increase in the rate of CO₂ assimilation, water use efficiency, carboxylation, the number of branches, pods, and yield. Therefore, applying pyridoxine acted positively on soybean yield components when applied at the beginning of the pod development. In addition, doses between 20 and 80 g ha⁻¹ can be used to obtain higher yields.