ANÁLISE ECONÔMICA DA PRODUÇÃO EM LAVOURAS TRANSGÊNICAS DE SOJA [GlycinemaxL. Merrill] EM FUNÇÃO DE DOSES DE GLIFOSATO E MANGANÊS.

Glyphosate (N-[phosphonomethyl] glycine) is one of the most used herbicides in the systems of genetically modified agricultural product cultivation, especially for soybean. Studying the effects of glyphosate and manganese (Mn) application in different development stages on economic viability, it was developed two experiments at the Teaching and Research Farm, UNESP-Ilha Solteira, located in Selvíria-MS. The experiments were conducted, using soybean BRS Valiosa RR. The used experimental design was randomized block design with 4 replications, factorial arrangement. The product used to provide Mn as raw material contains Mn sulfate chelated with EDTA. The source of N-(phosphonomethyl) glycine was Roundup Original with concentration of isopropylamine salt of glyphosate 480 g L-1 (360 g L-1). The treatments: first experiment with glyphosate application at doses of 0 or 1440 g i.a. ha-1 in installments V3 and V7 stages or in single dose V7 stage in the absence or presence of 350 g i.a. ha-1 Mn applied in a single dose at V5 or in installments, with applications in V5 and V9. And in the second experiment, the glyphosate application in doses equivalent acid to 720 g i.a. ha-1 applied at V3, 1440 g i.a. ha-1 applied at V3 + V7, in the absence or presence of 350 g i.a. ha-1 Mn, applied at V5. The treatment foliar spray was always performed, with a 12 m long bar provided with 5 cone nozzles 110-02, spaced 50 cm, coupled to the tractor, and calibrated for application volume of 200 L ha-1 of syrup. Considering the results obtained with the treatments used, it was possible to identify a gain in the productivity of the implanted crop, so we can conclude that the treatment with greater economic viability was verified with the application of 1440 g ia ha-1 glyphosate in stages V3 and 0 g ha-1 of Mn, obtaining a gross profit margin of R $ 272.99 ha-1. [ABSTRACT FROM AUTHOR]