中文摘要：

对20个地中测坑进行不同地下水埋深下土壤水、盐运移及作物生长的分析，研究了地下水埋深对土壤水分利用效率（WUE）、养分（NO3-N）及作物生物性状指标的影响。结果表明：埋深为1．5～2．5m时，有利于作物生长，但从盐渍化控制角度看，地下水埋深宜控制在2．0m左右为宜；当地下水埋深大于2．0m时，目前的灌溉制度已经不能满足作物的正常生长需要，出现亏缺灌溉，需要增加灌水定额，本研究说明适宜地下水位的控制对于河套灌区节水改造具有重要的意义。

英文摘要：

In order to study the influence of water-saving projects on field soil water, salt in the Hetao Irrigation District, this paper is an attempt to discuss the influence of different kinds of groundwater buried depth on soil water use efficiency（WUE）, fertitizer（NOa -N） leaching and crop physiological index using 20 lysimeter columns in Hetao. The research results indicat that in the existing irrigation scheldule ,when the burying depth is 1.5-2.5 m, it is good for the water absorption of crop growth in the soil water fertilizer, salinity, which is suitable for burying depth. But, for the control of salinity , the suitable burying depth is controlled nearly 2. 0 m; and if the burying depth of the ground water is deeper, the present irrigation scheldule can not satisfy the normal growth of the crops, the irrigation will lack, which needs to increase the irrigating quota, then it is not favorable to grow for crops. This research shows that the control of suitable water level in the Hetao Irrigation District is of great significance to the reconstruction of water saving projects.