以莴笋为对象，研究了2种释放期90 d的缓/控释氮肥对莴笋产量品质的影响。结果表明，硫包衣尿素(SCU)施用相较于传统方式普通尿素分次施入可使莴笋增产4.55%，叶绿素含量提高2.40%、Vc含量提高7.69%、硝酸盐含量降低16.93%，而且比传统施肥方式减少了施肥作业次数。

With lettuce as the as the research object， effect of 2 kinds of Slow/Controlled-release nitrogen Fertilizer of release period is 90 days on Yield and Quality of Lettuce is studied. The result shows that the sulfur coated urea(SCU) can make lettuce yield increased by 4.55%， the content of chlorophyll 2.40%， Vc content increased salt content of 7.69% and nitrate is reduced by 16.93%，compared with the traditional way of ordinary urea application， and it can reduce the number of operations compared to the traditional way of fertilization.

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农业部西北地区蔬菜科学观测实验站项目(2015-A2621-620321-G1203-066)；甘肃省自然科学基金(1506RJZA195)；甘肃省农业科学院创新专项(2014GAAS02)。