Effects of Different Drip Irrigation Quantities on Dry Matter Accumulation and Grain Yield of Winter Wheat

The field experiment with the local popular winter wheat cultivar of Qingmai 7as material was conducted to analyze the changes of dry matter accumulation and yield of winter wheat under 7 different drip irrigation quantities.The results showed that LAIand total dry matter accumulation firstly increased and then decreased,and the highest appeared at anthesis stage.With the increase of drip irrigation quantities,the dry matter accumulation,dry matter translocation amount and ratio of dry matter translocation amount after anthesis increased while dry matter translocation amount to grains before anthesis,ratio and contribution of dry matter translocation amount before anthesis to grains decreased.Dry matter in treatment of CK1 was mainly transferred to grains before flowing,while dry matter was accumulated mainly after flowing in other treatments.The contribution of dry matter assimilation amount after anthesis to grains,distribution percentage rate in grain and yield in the treatments of W4 and W5 were significantly higher than those in other treatments.