中文摘要：

施肥是作物生产的主要措施,但不合理的施肥导致肥料利用率下降、效益降低。试验研究了5种不同氮肥施用量对黄瓜产量、植株氮素累积和氮肥利用率的影响,结果表明：施氮能显著提黄瓜的产量,以优化氮肥处理（N2P2K2）（22 kg/667m2）产量最高,比不施氮肥处理高99.33%,比常规施肥处理高9.49%;不同施肥量条件下的氮肥利用率也不同,以优化氮区居最高,为33.16%,130%优化氮区（N3P2K2）最低,仅为18.47%,表明氮肥过量施用,肥料利用率下降。因此,在长沙县土壤有机质含量较丰富的蔬菜基地种植黄瓜时,施用P2O5 11.2 kg/667m2、K2O 11.9 kg/667m~2的条件下,氮肥使用量以22 kg/667m2为宜。

英文摘要：

Fertilization is a main procedure of crop production, but improper fertilization could cause the decrease of fertilizer use efficiency and reduce the benefits. The research studied the influence of 5 different kinds of nitrogen fertilizer on the yield, plant total nitrogen accumulation and nitrogen utilization efficiency of cucumbers. The results showed that nitrogen fertilizer could improve the yield of cucumbers and the treatment of optimized nitrogen fertilizer （N2P2K2） （22 Kg/667m2） had the highest yield, which was higher than no nitrogen fertilizer treatment and conventional fertilizer treatment by 99.33% and 9.49%, respectively. The fertilizer nitrogen use efficiency also differed under different application rates, and the optimized nitrogen application area was the highest, 33.16%; however, the treatment of 130% of the optimized nitrogen application rate （N3P2K2） had the lowest fertilizer use efficiency, only 18.47%, which indicated that excessive application of nitrogen fertilizer would result in the decrease of fertilizer use efficiency. So for cucumber production in Changsha county where the soil is rich in organic matters, the preferable application rate of nitrogen fertilizer is 22 kg/667m2 under the condition of applying with 11.2 kg/667m2 P205 and 11.9 kg/667m2 K20.