Influence of seeding date and seeding rate on yields of main wheat varieties in Qingpu,Shanghai

The split-plot experiment of three factors(variety,seeding date and seeding rate) was carried out with the main wheat varieties in Qingpu area.The results showed that the variety 'Yangmai 16' had an obviously higher yield than other two varieties and was more suitable for planting in Qingpu;Between Oct.31 and Nov.15,the yield gradually decreased with the seeding date delaying,but could be effectively improved by appropriate early seeding;Appropriately increasing seeding rate could improve the yield,and the yield performance was the best when the basic seedlings were 3.6 million plants/hm~2.