Acúmulo de nutrientes em soja convencional e soja RR em diferentes tipos de controle de planta daninha

The cultivation of soybean-Glycine max (Roundup Ready® - RR) has increased and little has been reported on the influence of glyphosate on the nutritional status of the plants. The aim of this work was to compare nutrient accumulation at different phenological stages between the cultivars BRS 184 (conventional) and BRS 243 RR (transgenic), with the same crop cycle, under different weed management systems (hand weed and herbicide). Nutrient accumulation and dry matter in conventional soybean was superior to that in the glyphosate-treated RR soybean, indicating that a higher level of nutrients might be required for the RR cultivars to achieve physiological efficiency and a new fertilizer recommendation for RR crops may be considered, due to the reduced nutritional efficiency imposed by glyphosate.