为明确灌水和施氮对甘肃河西走廊地区垄膜沟灌玉米产量的影响，通过裂区试验，研究了不同施氮量和灌溉定额下垄膜沟灌玉米的产量及水分利用效果，结果表明，施氮、灌水以及二者之间的交互作用对玉米产量均有重要影响。灌溉定额从3 600 m3/hm2增加到4 500 m3/hm2和在0～300 kg/hm2范围内增施氮肥，玉米穗粒数、千粒重增加、增产显著。增加灌水和减少施氮，玉米水分利用效率降低。其中施N 300 kg/hm2、灌水定额为4 500 m3/hm2处理的玉米产量及水分利用效率相对较高，与最高产量处理施N 300 kg/hm2、灌水定额为5 400 m3/hm2相比，仅减产0.17%，减产差异不显著，且水分利用效率较施N 300 kg/hm2、灌水定额为5 400 m3/hm2处理提高了11.45%，节水900 m3/hm2。在河西走廊垄膜沟灌栽培条件下，可选择施N 300 kg/hm2和灌水4 500 m3/hm2为玉米的适宜氮肥用量和灌溉定额。玉米获得15 000 kg/hm2以上高产的适宜施氮量为180～390 kg/hm2，灌溉定额3 720～5 100 m3/hm2。

In order to determine the effects of irrigation and nitrogen application on the yield of corn under ridge film furrow irrigation in Hexi Corridor of Gansu Province， the yield and water use effect of corn under ridge film furrow irrigation under different nitrogen application rate and irrigation quota were studied by split plot test. The results showed that nitrogen application， irrigation and the interaction between water and nitrogen had important effects on corn yield. When the irrigation quota increased from 3 600 m3/hm2 to 4 500 m3/hm2 and the application of nitrogen fertilizer increased in the range of 0～300 kg/hm2， the number of grains per ears of corn and 1000-grain weight also increased， and yield increased significantly. Increasing irrigation quota and reducing nitrogen application，water use efficiency of corn decreased. The yield and water use efficiency of corn treated with N 300 kg/hm2 and irrigation quota of 4 500 m3/hm2 were relatively higher， and the yield reduction was only 0.17% compared with that of the highest yield treated with N 300 kg/hm2 and irrigation quota of 5 400 m3/hm2， with no significant difference in yield reduction. Compared with N 300 kg/hm2 and irrigation quota of 5 400 m3/hm2， WUE increased by 11.45%， water saving 900 m3/hm2. Under the conditions of cultivation of raised bed covered with plastic film and furrow irrigation in the Hexi Corridor， 300 kg/hm2 and 4 500 m3/hm2 can be selected as the suitable nitrogen application rate and irrigation quota for corn. To obtain yield above 15 000 kg/hm2 for corn， the suitable nitrogen application and irrigation quota ranges are 180～390 kg/hm2 and 3 720～5 100 m3/hm2 respectively.

S513； S275； S147.2

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