The effects of the dressing rate of nitrogen fertilizer on rice morphological characteristics and grain yield and quality were studied, so as to clarify the optimal dressing rate of nitrogen fertilizer for rice variety Shengdao 735. Six nitrogen appli- cation rates （No （0 kg/hm2）, N1 （69 kg/hm2）, N2 （138 kg/hm2）, N3 （207 kg/hm2）, N4 （276 kg/hm2） and N~ （345 kg/hm2）） were designed. The results showed that with the increase of the nitrogen application rate, the protein content and amylase content of rice increased; the plant height, tiller number, effective panicle number per hill and grain yield increased at first and decreased then; and the grain number per panicle, 1 000-grain weight and taste value decreased. The brown rice rate, head rice rate and chalky kernel percentage did not change significantly. Shengdao 735 gave the highest production in N4 treatment the nitrogen application rate of which was 276 kg/hm2. The result of regression analysis showed that the grain yield and economic benefit were the highest in treatment N4. The nitrogen fertilizer rate of 276 kg/hm2 was suitable for Shengdao 735.
