作物水分产量潜势有许多计算方法.本文则是通过田间试验研究,采用“旱作水分产量潜势系数”(kdp)为指标,来评价所研究的旱作地区作物水分生产潜力.研究结果表明,半湿润的长武塬区在常态水文年份中,旱作小麦的 kdp 达到0.90—1.00,旱作玉米达到0.85—1.00,从而显示了进一步的生产潜力.文中并对旱作农田供水过程和土壤水势分布进行了讨论.提出了黄土高原南部建立玉米带的水分适宜性. There are many calculation methods for the potential crop water potential.This paper evaluates the potential of crop water productivity in the dry farming area by using the field experiment and the “kdp” In semi-humid Changwuyuan area, the kdp of dry-land wheat reached 0.90-1.00 in normal hydrological years and 0.85-1.00 in dry-land corn, which showed the further potential for production. In this paper, the water supply process and soil The distribution of water potential is discussed, and the suitability of establishing corn belt in the southern loess plateau is proposed.