Effects of Different Water Fertilizer Treatments on Yield and Starch Structure of Nanjing 9108

High quality and high yield late ripening Zhongjing Nanjing 9108 were used as research materials.Different nitrogen fertilizer and soil moisture treatment were adopted to explore effects of different water fertilizer measures on yield.Internal fine structure of starch was taken as breakthrough，and internal molecular weight and crystal characteristics were combined to analyze external performance.Research results showed that combination of mild dry-wet alternate irrigation W2（-15 kPa）and medium nitrogenous fertilizer level N2（N of 276 kg/hm2）could delay leaf senescence in seedling stage，so that rice plants still have higher activity in later stage of seedling，maintain stronger photosynthetic capacity and improve yield.In addition，in W2N2 water fertilizer mode，short chain part of rice starch takes up a large proportion，and order of inner layer and relatively high crystallinity were conducive to full pasting of rice starch，thus promoting improvement of taste.