Use of biostimulant in the reversion of injury caused by glyphosate on conventional corn plants

Abstract

Conventional corn cultivation has been taking up space in the national agricultural panorama due to the difficulty of controlling the corn in subsequent crops. However, glyphosate drift in adjacent crops has become a concern among producers and technicians. Thus the experiment was installed to evaluate the effect of low doses of glyphosate on the crop and the ability of a plant hormone-based biostimulant to reverse the injuries caused by the herbicide, evaluating the morphological characteristics and photosynthetic rate of corn plants. It was used a completely randomized design with four replicates in factorial arrangement 5 X 2, with the first factor corresponding to five doses of glyphosate (0, 10, 20, 30 and 40 g e.a ha-1), and the second, the absence and presence of the biostimulant. The evaluated characteristics were phytotoxification, stalk diameter, plant height and fresh root and shoot mass, SPAD index and photosynthetic rate. The higher dose of glyphosate resulted in higher phytointoxication, plants with lower height and lower SPAD index. Biostimulant provided increases in stalk diameter, SPAD index and photosynthetic rate. The presence of biostimulant did not provide a repairing effect on the deleterious effects caused by glyphosate in conventional corn plants.