在氮肥长期定位施用的试验条件下研究了几种蔬菜在不同施氮水平下的氮素吸收量、产品器官内Ｎ素浓度及氮素利用效率的变化。结果表明，蔬菜吸Ｎ量在种类之间的差异可达４．５～４．８倍，雪里蕻、大白菜等叶菜不仅平均Ｎ素浓度较高，且对施肥量增加反应敏感；产品器官的含Ｎ量与ＮＯ－３含量存在极显著的相关关系；不同蔬菜的氮素利用效率差异明显，大白菜、黄瓜对增施有机肥及无机Ｎ肥均较敏感；甜椒、雪里蕻及马铃薯等对增施无机Ｎ肥敏感或比较敏感。 Under long-term application of nitrogen fertilizer, the nitrogen uptake, the concentration of N and the nitrogen use efficiency of several vegetables under different nitrogen application rates were studied. The results showed that the difference in the amount of nitrogen uptake in vegetables was 4.5-4.8 times. The chlorophyll content in leafy vegetables was not only high in average N, but also sensitive to the increase of fertilizers. There was a significant correlation between N content and NO-3 content. The nitrogen use efficiency of different vegetables was significantly different. Chinese cabbage and cucumber were more sensitive to organic manure and inorganic N fertilizer. Increased application of inorganic N-sensitive or more sensitive.