Increased productivity, cost reduction and improvement in logistic application makes the association product with glyphosate is an increasingly common practice for farmers. The objective was to investigate the grain yield and weed control in response to application of glyphosate and micronutrients mixed in the spray solution in different cultivars of soybean and corn hybrids. Two experiments were carried in the 2011/2012 harvest: one in Santa Cruz, with the soybean crop, and another in Ourinhos, with the corn crop. The treatments consisted of application of glyphosate, two doses (720 and 1080 kg ha-1) in combination with micronutrients in three concentrations (0, 2, 3 kg ha-1), two soybean cultivars (Vmax and Force) and a witness (control). For corn were three hybrids (DKB390, DKB177 and AG8071), three doses of micronutrients (0, 2, 3 kg ha-1) and a witness, totaling 10 treatments for maize and seven for soybeans. The experimental design for both experiments was a randomized block with 4 repetitions. The productivity of soybeans and corn and control of weeds depends directly of the cultivar / hybrid and the ability of the same against the weed interference. The mixture of glyphosate with micronutrients may interfere with weed control, where the largest herbicide doses associated with lower micronutrient intakes allows greater control of weeds, reducing the amount of accumulated dry matter.

Keywords: Glycine max, Zea mays, Micronutrients, Weed competition.