Currently, soybeans are one of the most important oleaginous in production, producing more protein per hectare than any other crop plant. The development of new production areas and the diffusion of soybeans may be key to the global food supply. With the increase of areas cultivated with soybeans in Brazil, and as the technologies available, the use of herbicides can be as precious as possible. The alternating use of herbicides with different mechanisms of action, in tank applications or mixtures, is an indispensable alternative for the management of weeds in agriculture. However, a form of processing in a breed may require effects on weeds and crop, thus, a mechanism of research on the effects, interactions and action of herbicides. The experiment was carried out at the experimental station of the Federal University of Tocantins (UFT). The experimental design was used for randomized blocks (DBC) with replicates and seven treatments - control without weeding; weeded witness; glyphosate 960 g.i.a. glyphosate 1440 g.i.a. glyphosate + clethodim; glyphosate + bentazone; glyphosate + chloransulam - produced morphologically of plants of size, number of pods, number of nodes, dry mass of the aerial part and productivity. Physiological analyzes of photosynthesis (A), stomatal conductance (Gs), internal atmosphere (Ci) and transpiration (E). It analyzes biochemicals of the enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase ascorbate (APX). Treatment of glyphosate + chloranxulam was the most detrimental for the production of physiological foods of stomatal conductance and carbon concentration. A soybean cultivar, the antioxidant enzyme defense mechanism in play by ROS. The SOD presented greater activity in the treatment of glyphosate, applied alone at the dose of 1440 g.i.a. A CAT includes a variety of treatments. The healthy APX showed higher activity in the capillary inspection, and it had a higher activity in herbicide blending treatments, with glyphosate + chloransulam treatment being the most affected.
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