Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College University 225009.R.China;
Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops University 225009.R.China;
Joint International Research Laboratory of Agriculture and Agri-Product Safety of Education of China University 225009.R.China;
nitrogen fertilization; rice starch; starch structure; physicochemical properties; chain length distribution;