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作物需水量是农业方面最主要的水分消耗部分。目前确定作物需水量的方法很多，国际上通用的方法是利用参考作物腾发量法推求ＥＴｃ。本文采用内蒙古地区复杂气候与地埋环境条件下的１３５个气象站３０年月均气象资料对ＦＡＯ最新推荐的ＦＡＯＰｅｎｍａｎ－Ｍｏｎｔｅｉｔｈ（１９９０）方法与我国ＳＤＪ２１４－８４规范采用的ＦＡＯＰｅｎｍａｎ修正式（１９７９）进行系统对比分析，以探求两方法的适用条件及引起差异的原因。进一步促进国际上作物需水量新方法在我国的实际应用。结果表明两方法具有较大的差异性。在湿润地区或季节，两方法的差异最大，平均相对误差最大可达２３．４３％。除在干旱地区或季节外，ＦＡ０－Ｐ－Ｍ方法均大于ＦＡＯ－Ｐ修正式计算结果。
Crop water demand is the most important part of the water consumption in agriculture. At present, there are many ways to determine the water demand of crops, and the internationally accepted method is to use the reference crop evapotranspiration method to find ETc. In this paper, the 30-year average meteorological data of 135 weather stations in the complex climate and buried environment of Inner Mongolia were used to analyze the latest FAOPenman-Monteith (1990) method proposed by FAO and the FAOPenman modified method (1979) adopted by China’s SDJ214-84 System comparative analysis to explore the application of the conditions of the two methods and the reasons for the difference. Practical application of new method to further promote international crop water demand in our country. The results show that the two methods have great differences. In wet areas or seasons, the difference between the two methods is the largest with the average relative error up to 23.43%. Except in arid areas or seasons, the FA0-P-M method was larger than the revised FAO-P results.