为探讨高寒阴湿区栽培陇薯6号脱毒原种的最佳氮磷肥用量及密度，为推广和应用该品种提供理论依据。利用二次通用旋转组合试验设计，构建了氮肥(X1)、磷肥(X2)和栽培密度(X3)三因素与陇薯6号脱毒原种产量(Y)之间的回归模型:Y=38.139+2.519X1-3.662X12-1.719X22-1.719X32。对模型解析寻优的结果表明，高寒阴湿区陇薯6号脱毒原种块茎产量大于33 t/hm2的最优栽培方案为:施N 168.22～204.87 kg/hm2、P2O5 104.98～165.02 kg/hm2，密度为47 497～57 503株/hm2。

In order to explore the optimal rate of nitrogen and phosphorus fertilizers and density for the cultivation of Longshu 6 virus-free original seed in alpine humid region, a regression model was constructed using a quadratic universal rotation combination experimental design to investigate the relationship between nitrogen fertilizer(X1), phosphorus fertilizer(X2), and cultivation density (X3) and the yield(Y) of Longshu 6 virus-free original seed. A mathematic model, Y= 38.139 + 2.519 X1 - 3.662 X12 - 1.719 X22 - 1.719 X32 was obtained, result of the model optimization showed that cultivation mode for yield of Longshu 6 to be more than 33 t/ha in alpine humid regionwas pure N at 168.22 to 204.87 kg/ha, P2O5 at 104.98 to 165.02 kg/ha and density at 47 497 to 57 503 plant/ha.

S532；S147.2

国家自然科学基金(32260480)；甘肃省农业科学院重点研发计划(2022GAAS36、2023GAAS20)。