In Brazil, soybean and one of the leading Agricultural Culture and driver of Gross Domestic Product (PIB). However, a chemical composition of the grains, such as oil, protein, present variations in relation to the Environment Quality is exposed, affecting industrial productivity. In this sense, this study was conducted with the objective of evaluating the chemical quality of soybean cultivars grains, as a function of delay harvest in the state of Tocantins. In the agricultural year of 2014/15, there were two competition assays of soybean cultivars in Palmas-TO, the first being installed on December 17, 2014 and the second on January 04, 2015. The experimental design used in each season sowing was a randomized block with treatments arranged in a split plot, represented by 10 genotypes of soybean and seven of Grain Harvest Stadiums (R6, R7, R8, R8 + 7, R 8 + 14, R 8 + 21 and R8 + 28 days), according to FEHR et al 1971. As sowing dates, generally did not alter the chemical composition of soybeans. There was inconsistency as to the effect of harvest date on the chemical composition of soybeans, may have been derived from the Grain Sampling errors. The TMG132 cultivars RAÇA and M9144 RR showed higher oil content, OPUS and M9144 RR higher protein content in grain.
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