Effects of Application Methods of Nitrogen Fertilizer on Yield and Nitrogen Utilization Rate of Rice

Using the controlled release nitrogen fertilizer and nitrogen fertilizer as the tested material,the effects of different application methods of nitrogen fertilizers on the yield and nitrogen utilization rate of rice were studied.The results showed that the disposable basal application of 240 kg/hm2 nitrogen could not fulfill the normal growth of rice,so the yield of rice decreased.The basal application of controlled release nitrogen fertilizer could increase the effective spikes and improve the yield components per plant,increase the nitrogen utilization rate significantly,then increase the yield.When the application of controlled release nitrogen fertilizer was 168 kg/hm2,the nitrogen utilization rate was the highest,and the yield was higher than the treatment with urea.When the controlled release nitrogen fertilizer(168 kg/hm2 nitrogen) and urea(72 kg/hm2 nitrogen) were applied at the same time,the filled grains,seed setting rate and yield were the highest.