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作物系数是计算作物需水量必不可少的参数。该文介绍了 FAO近期推荐的确定作物系数的 2种计算方法 ,一种是比较简单实用的分段单值平均法 ,另一种是比较复杂但相对准确的双值作物系数法。用河北省雄县灌溉试验站的冬小麦、夏玉米田间土壤水分观测资料计算作物实际腾发量 ,对上述 2种确定作物系数的方法进行了检验。计算的作物系数与雄县试验站的实测结果基本接近 ,从而初步证明了在缺少实测资料的情况下可以采用 FAO推荐的方法确定华北地区主要作物的作物系数
Crop coefficient is an essential parameter for calculating crop water requirement. This paper introduced two kinds of calculation methods recommended by FAO recently for determining crop coefficient. One is simpler and practical piecemeal averaging method and the other is a more complex but relatively accurate method of double crop coefficient. The actual crop evapotranspiration was calculated using soil moisture data from winter wheat and summer maize fields in Xiongxian Irrigation Experimental Station in Hebei Province. The above two methods for determining crop coefficient were tested. The calculated crop coefficient is basically close to the measured result of Xiongxian Experimental Station, which proves initially that the method recommended by FAO can be used to determine the crop coefficient of main crops in North China in the absence of observed data