控释尿素对云南玉米产量和氮肥利用率的影响

Effects of Controlled-release Urea on Yield of Maize and Nitrogen Use Efficiency in Yunnan

通过连续2年的田间小区试验,研究了100%、75%和50%控释尿素(CRU)单独施用,100%、75%和50%普通尿素单独施用,以及普通尿素和控释尿素共同施用对玉米产量、农艺性状和氮肥利用率的影响。结果表明:在施氮量相等的条件下,施用控释尿素的玉米产量比普通尿素的产量提高4.7%~16.3%,氮肥利用率提高5.3%~17.4%,氮肥农学利用率提高1.2%~7.2%;在当地试验条件下,CRU75%处理与CRU50%处理是较佳的处理。

The field experiments were conducted to investigate the effect of controlled-release urea(CRU)and regular urea on agronomic traits and yield of maize and nitrogen use efficiency as well in Qujing,Yunnan in two years.Results indicated that CRU increased maize yield by 4.7%-15.6%,nitrogen use efficiency by 5.3%-17.4%and agronomic efficiency of nitrogen by 1.2%-7.2%compared to the regular urea.It is suggested that CRU 75%and CRU 50%can be considered as the optimal CRU rates for maize in the region under the cultivation with plastic mulching.