Variação da umidade de sementes em plantas de soja cultivadas no extremo sul do Brasil

Abstract

The objective was to evaluate the moisture distribution during physiological maturity of soybean seeds in irrigated soil conditions. The experiment was conducted in the Brazilian Agricultural Research Corporation (EMBRAPA), the Temperate Climate unit - Experimental Lowlands Station, located in the municipal district Lion - RS. We used the BMX Turbo RR cultivars indeterminate growth habit, maturity group 5.8, certain super-early maturity and BMX Active RR growth habit, maturity group 5.6, superearly maturity. To evaluate the dispersion seed moisture within the same plant were marked hundred plants at the same stage of maturity. Harvesting began yellowing of the first pod in the plant, and after that, every two or three days, two plants of each genotype were taken. For the 2012/2013 harvest were made thirteen crops for twenty eight days. In the season 2013/2014 seven samples were collected for fourteen days, the highlighted pods one by one from each plant and manually threshed for the determination of moisture each vegetable. The growth habit of soybean cultivars, similar to maturity groups does not influence the moisture medium during the process of drying the soybean field between the physiological maturation and harvesting stage. At the point of harvest, seed moisture variation in a given plant growth habit is lower than that found in seeds of a plant undefined habit. The period in which the first seeds enter the physiological maturity can vary from 15 to 25 days to the possible point of actual harvest.