Study on The Dynamic and Models of Dry Matter Accumulation and Distribution in Winter Wheat under Different Water and Fertilizer Treatments

In order to research the effect of different irrigation and fertilization on dry matter accumulation and istribution,four water and fertilizer treatments were conducted to study the dynamic of dry matter accumulation and distribution of winter wheat under the field experiment.The results showed that dry matter accumulation in different treatments had a similar dynamic in growing period of winter wheat,and the increasing trend is slow-fast-slow.The peak value of NDMA and CGR appeared at jointing-heading stage.The partition coefficients of photosynthate distribution between root,stem,leaf and grain varied significantly under different water and nutrient stresses.Under severe water and nutrient stress,the partition coefficient of root increased and the partition coefficient of grain reduced.Grain distribution coefficient obtained higher under medium irrigation,medium or lower fertilizer levers.The sorting of fitting precision of dry matter accumulation was as Cubic curve model Logistic modelS curve model.