Manejo de fertilizantes foliares na recuperação da fitotoxidade gerada pelo Glyphosate na cultura da soja (Glycine max)

Abstract

Soybeans (Glycine max) is an agricultural crop that stands out nationally and globally, due to its chemical composition being rich in protein and oil, which are essential in human and animal food. For high yields, the crop is very demanding in the management of pests, diseases and the control of weeds, which cause significant losses in production, mainly due to competition for water, light and space. Thus, the chemical control with herbicides is the most used by producers due to the ease and fast action. Even using cultivars with Roundup Ready technology, which have tolerance to glyphosate, there are reports that high doses of the herbicide cause phytotoxicity in soybeans. Therefore, this work aimed to evaluate the behavior of the crop in response to the use of glyphosate alone and in mixtures with fertilizers, aiming to recover the plant from phytotoxicity. An experimental design was used, with 9 treatments and 5 repetitions. The treatments T2, T4, T6, T8 were applied when the plots were at the V2 stage, while the treatments T3, T5, T7, T9 were applied when the plants were at the V5 stage. The parameters analyzed were: plant height, number of nodes, number of pods, mass of one thousand grains and productivity. Based on the parameters evaluated, treatment T9 associated with fertilizers showed the best results, reducing the phytotoxic effects of the herbicide, producing 1002.78 kg.ha-1 , increasing production by 38.13% when compared to the control.