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中文摘要：
针对目前马领薯种植中氮肥利用率较低等问题,采用5因素5水平（1/2实施）的二次回归正交旋转组合试验设计方法,在宁夏中部干旱地区开展了马铃薯室外盆栽试验,分析了不同水肥配合对马铃薯的氮素利用率的影响规律。研究得出,试验条件下氮素利用率达到最大值时的各因素（灌水时期、灌溉定额、施氮量,磷肥和钾肥用量）最佳组合。即,试验条件下氮素利用率最大值时各因素最佳组合为：灌水时期为苗期,现蕾期,花期和成熟期四个生育期灌水,分别灌灌溉定额的25%;灌溉定额为900m^3/hm^2,施氮量为225kg/hm^2;磷肥为225kg/hm^2;钾肥为375kg/hm^2。
英文摘要：
In view of the low nitrogen fertilizer utilization rate of the present potato planting,the potato outdoor pot experiment is conducted in the arid regions in central Ningxia by using the quadratic regression orthogonal rotary combination experimental design method with 5factors and 5levels to analyze the influences of different proportions of water and fertilizer on the nitrogen utilization ratio of the potato.The best combination of various factors,including irrigation times,irrigation quota,fertilizer amount,phosphate fertilizer and potash fertilizer dosage,for the maximum nitrogen utilization rate under the experiment condition is found.That is：the irrigation periods are at the seedling stage,budding stage,flowering stage and mature stage,and the irrigation quantity for each stage is 25% of the whole irrigation quota;the whole irrigation quota is 900m^3/hm^2,the nitrogen fertilizer quantity is 225kg/hm^2,the Phosphate fertilizer is 225kg/hm^2 and the Potash is 375kg/hm^2.
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