在半干旱区研究了传统耕作(T)和垄上覆膜沟内覆草摆种(PDSS)、垄上覆膜沟内覆草浅播(PDSSH)、垄上覆草摆种(RSS)、平作覆草摆种(FSS)、垄上不覆膜沟内覆草摆种(DSS)和草膜双覆盖摆种(DFSS)6种保护性耕作措施对马铃薯水分利用的影响。结果表明，保护性耕作措施可以有效地提高0～80 cm土壤的贮水量，尤其是0～30 cm土壤的贮水量，提高幅度均在10%以上；DFSS处理可以显著地提高马铃薯大薯率，较传统耕作提高32%；FSS处理的综合效果均优于其他处理。黄土高原西部旱农区马铃薯保护性耕作采用平作覆草摆种效果较为理想。

The study aims at water use efficiency of potato to the effect of traditional tillage and six conservation tillage measures: PDSS， PDSSH， RSS， FSS， DSS and DESS. The studies shows that the conservation tillage measures can effectively improve soil water storage of 0~80 cm， especially soil water storage of 0~30 cm， the rate is more than 10%；DFSS's measure can obviously improve the big potato rate of potato， the rate is improved 32% on the basic of traditional tillage；the synthetical effect of FSS's measure is even better than others. Therefore， conservation tillage measure of the potato of loess plateau's western arid regions uses FSS， the effect is rather ideal.

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