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采用D最优饱和设计方法并回归建模对太行山区旱地谷子推荐施肥量及提高降水利用效率进行了研究。结果表明：最佳经济效益下的推荐施肥量N＝207．0kg／hm~2，P_2O_5＝292.4kg／hm~2。目前产量水平下，氮磷配施（N：P_2O_5＝1：1．41）不施钾肥具有明显的增产高效效果。依据最佳经济效益推荐地肥量，较未施肥谷子产量提高72．5％，降水利用效率提高3．78kg／hm~2·mm。
Based on D optimal saturation design method and regression modeling, the recommended fertilization amount and the utilization efficiency of precipitation in the dryland of Taihang Mountains were studied. The results showed that the recommended fertilizer amount under the best economic benefit was N = 207.0kg / hm ~ 2 and P2O5 = 292.4kg / hm ~ 2. Under the current production level, the application of N and P fertilizers (N: P_2O_5 = 1: 1.41) did not affect the yield and efficiency of K fertilization. According to the best economic benefit, the recommended fertilizer amount increased 72.5% than the non-fertilized millet and the precipitation efficiency increased by 3.78kg / hm ~ 2 · mm.