The Simulation Analysis of Relationship between Seeding Date and Growth development Characters and Seed Yield Formation of Xiangnongyou571

In order to popularize the new double low cultivar of rapeseed with high yield, the relationship between seeding dates and development characters and seed yield formation of Xiangnongyou571 was studied. The results show that obvious differences happened to development stages,morphological and yield characters of rapeseed because of the different climate ecological conditions caused by different seeding dates.The development stages are positively correlated with accumulated temperature,negatively with mean air temperature,and not correlated with hours of sunshine.But there is a extremely significant correlation between the morphological and yield characters and these climate factors. So the earlier the seeding date is, the higher the number of leaf in main stem, LAI, plant height, the number of branch, the number of pod and the yield are. The seeding date model and the accumulated temperature model established according to logistic equation can simulate the morphological and yield characters of rapeseed in different seeding dates or under different accumulated temperature conditions. Validation of the model indicates that there exits an agreement between simulated values and observed values to a certain degree. In suitable rapeseed planting areas, it is practicable to sow Xiangnongyou571 or the same type cultivar of rapeseed before September 15.The yield is expected to be over 3 000 kg/hm 2.