Abstract: In order to investigate the effect of controlled release blend bulk urea on growth and yield of rice and wheat， plot experiments were conducted to analyze the difference of plant height in every growth period， dry matter accumulation as well as organ partitioning， yield and its components. The results showed that compared with normal urea treatment （U100）, the height of rice and wheat， dry matter accumulation， and growth rate were significantly increased during the middle and late growth stage with above 20% controlled release urea added. Wheat and rice yield were increased by 6%-14% and 7%-11%， respectively. Among all the treatments， blending of 40% controlled release urea and 60% urea （CRU40U60） was beneficial to agronomic traits and growth rate. CRU40U60 treatment not only obviously increased spike length， but reached the highest wheat yield, which was 14% and 8% higher than that of U100 and 100% controlled release urea treatment （CRU100）， respectively. CRU40U60 treatment also enhanced the seedsetting rate and grain number per panicle of rice and reached the highest yield, which was 11% and 4% higher than that of U100 and CRU100， respectively. Based on this experiment condition， adding 40% controlled release urea was moderate. With onetime basal application， it reduced the cost of labor， which added the acceptability of farmers. Hence， the blending application of 40% controlled release urea and 60% urea （CRU40U60） was recommended as the relatively appropriate ratio to promote the growth and yield of rice and wheat.

Key words: rice and wheat, controlled release blend bulk urea, agronomic traits;