Light availability in the cultivation environment and the action of glyphosate on : physiological aspects and herbicide root exudation.

The root exudation decreases the susceptibility of some species to herbicides, which is still little studied in popularly known as sourgrass, one of the main weeds of annual crops in the world. Thus, we sought to identify whether there is an occurrence of root exudation of glyphosate in and the influence of this herbicide on physiological and control parameters of this species when cultivated under different light conditions. The experimental design was 2 x 5, with the first factor represented by environments: full sun and artificial shading.