Evaluation of Growth Characteristics and Seedling Vigor in Two Cultivars of Soybean dried under different Temperature and Fluidized bed dryer

ABSTRACT: Soybean seed quality is defined as the attributes that will determine the performance of seeds when sown or stored. In this research using a drying system with the fluidized bed, effect of temperature and seed bed changes on the seed quality characteristics associated with seed vigor two cultivars of soybean were studied. Therefore, harvested seeds after conditioning, by a batch fluidized bed seed dryer at 30, 40, 50 and 60°C temperatures and three seed bed situations in dryer: constant seed drying bed situation, fluidizing threshold and fluidized to standard seed moisture content (about 12%) were dried. Test germination and seed vigor tests using of ISTA methods were conducted for assess of seed quality seed and seedlings. The growth characteristics and seedling vigor in standard germination test data were determined in laboratory. The growth characteristics in the samples dried in fluidized bed drying is greater compared to those dried under constant seed drying bed situation. The results show that the decrease of the growth characteristics and seedling vigor are associated to conditions that lead to a high drying rate. Germination and vigor reduction is also associated to the over drying conditions. In this experiment, the lowest percentage of germination, length and weight index of seed vigor and other characteristics at 50 and 60 °C in a fluidized bed was and at 30 °C and 40 °C in a fluidized bed threshold the bed, most of the characters were. In both experiments the Katool cultivar toward Sari cultivar figures showed more resistance than it is probably due to genetic characteristics.