Early soybean sowing, especially using early cultivars is a practice that is adopted by many growers from the State of Paraná in order to anticipate harvest and to enhance growing corn crop during the fall. Experiments of soybean cultivars competition trials were carried out at COODETEC in the city of Palotina, Paraná State, aiming to evaluate the influence of early sowing on the chemical composition of seeds, as well as yield. A randomized block design, comprised by two crop years (2003/2004 and 2004/2005), three early cultivars (CD 202, CD 215 and CD 216); and five sowing times (09/15, 09/30, 10/15, 10/30 and 11/15) was utilized. Also, oil and protein content were also determined. The productivity (kg ha-1) was calculated using the yield of grain in each parcel. All data were submitted to variance analysis of group experiments along with all interactions and necessary adjustments. Results allowed to conclude that early sowing can influence grain yield and seed chemical composition.
Glycine max; sowing date; production; chemical composition
