在田间试验条件下，以水肥耦合为中心，马铃薯为供试材料，用５ 因素５ 水平二次回归正交旋转组合设计方法，研究了宁南山区供水肥时期、供水量、施氮量、施钾量和种植密度５ 个因素对产量的综合效应。结果表明：①５ 因素的作用顺序为：种植密度＞ 施氮量＞施钾量＞ 补水量＞ 补水肥时期。②供水量与施氮量的关系中，低水低氮配合，产量很低；高水高氮配合，产量也仅在中产水平徘徊；试验条件下，６００ ｋｇ／ｈｍ ２ 与５０ ｍ ｍ 水配合，产量高达１９．０５１ ｔ／ｈｍ ２．③在水肥状况得到改善的基础上，加大种植密度是增产的必然途径 Under the field experiment conditions, water-fertilizer coupling as the center, potato as the test material, with 5 factors and 5 levels of quadratic regression orthogonal rotation combination design method to study the water supply period of Ningnan Mountain, water supply, Potassium and planting density of five factors on the yield of the combined effect. The results showed that: ① The order of the five factors was: planting density> nitrogen application rate> potassium application rate> water replenishment rate> water supplement fertilizer period. In the relationship between water supply and nitrogen application, low-water-low-nitrogen co-operation resulted in very low yields. High-water-high-nitrogen combined production only hovered at middle levels. , Yield up to 19.051 t / hm 2. ③ In the water and fertilizer conditions have been improved on the basis of increased planting density is the inevitable way to increase production