Abstract: Effects of application of controlled\|releasing bulk blending urea on rice yield, quality and nitrogen utilization efficiency were studied under the field conditions. At the same N rate, the differences of rice yield between each treatment were not significantly except for the treatment of CRBU+PU and PU1. Under the condition of reducing 30% N rate, rice yield of 70% CRBU was significantly deceased, but not for 70% (CRBU+PU). Nitrogen use efficiencies of CRBU, CRBU+PU, 70% CRBU and 70% (CRBU+PU) were 30.9%, 39.6%, 24.0% and 38.1%, respectively. Difference of nitrogen use efficiency between the treatments of CRBU+PU and 70% (CRBU+PU) were significant, but not between the treatments of CRBU and 70% CRBU. More economic benefits of rice and higher crude protein in the rice and brown rice rate were found in the treatment of CRBU+PU．

Key words: rice, controlled-release bulk blending urea, yield, quality, nitrogen use efficiency