武川旱农试区农田水分生产潜力研究

Research on Soil Water Productive Potential in Rainfed Farmland in Wuchuan Rainred Agricultural Experiment Area

运用田间定位试验、高产地块调查及理论公式测算等多角度方法，对半干旱偏旱地区─—内蒙武川的农田水分生产潜力进行了研究，并对作物产量与气象因子、施肥条件及水分利用率的定量关系进行了探讨。结果表明；该地区限制农作物产量的主要因子是降水分布状况与养分供应不足，不同类型耕地的水分生产潜力相差甚大，近期约有２０％的潜力，远期约有１倍左右的潜力。

Such methods as the field fixed tests, invetigation into the high-yieldingfarmlands and estimation and calculation through theoretical formulas are used to studysoil water productive potential in farmlands in the semi-arid area liable to drought inWuchuan area of Inner Mongolia and to discuss the quantitive relationships among cropyields and climatic factors ,fertilization states and water use efficiency.The results showthat the major constraints restricting crop yields are the rainfall water distribution statesand deficient supply of crop nutriets.Also,there is a great difference in water productivepotential in different types of cultured farmlands.In the immediate future there will be20%of potential while in the long distance future,there will be about double potential or so.