通过田间试验研究不同钾肥施用水平对马铃薯产量及品质的影响。结果表明，不同钾肥施用量均有助于提高马铃薯产量。K2O用量达240 kg/hm2时，商品薯率、产量、干物质含量和淀粉含量均最高，还原糖、Vc和蛋白质含量有下降趋势。该水平下马铃薯商品薯率为80.56%，产量24 910.71 kg/hm2，较对照不施肥分别提高49.07%、25.87%，较施氮磷肥处理分别提高28.61%、17.67%；干物质、淀粉、还原糖、Vc和蛋白质含量分别较不施肥处理提高18.34%、18.18%、16.13%、11.58%、16.40%，分别较施氮磷肥处理提高9.75%、14.14%、9.09%、8.09%、11.68%。综合产量和品质表明，试验区马铃薯栽培钾肥适宜用量为K2O 240 kg/hm2。

Field experiments were set up to study the effects of different potassium application rate on the yield and quality of potato.The results showed that the yield of potato were all improved by the application of different potassium fertilizer，the commodity rate， yield， dry matter， starch of K2O 240 kg/hm2 treatment was the highest，but there was a downturn in reducing sugar， Vc and protein content. The commodity rate and yield of potato were respectively 80.56% and 24 910.71 kg/hm2， it was increased by 49.07% and 25.87% compared to the control without fertilization(CK)， it was increased by 28.61% and 17.67% compared to nitrogen and phosphate treatment. The content of dry matter， starch， reducing sugar，Vc and protein increased by 18.34%， 18.18%， 16.13%， 11.58% and 16.40% compared to CK， by 9.75%， 14.14%， 9.09%， 8.09% and 11.68% compared to nitrogen and phosphate treatment. Comprehensive yield and quality showed that the suitable amount of potassium fertilizer for potato cultivation in the experimental area was K2O 240 kg/hm2.

S532

现代农业产业技术体系专项资金(CARS-09)；国家马铃薯标准化区域服务与推广平台项目(NBFW-17-2019)；甘肃省级财政现代丝路旱寒农业发展项目资金(GNKJ-2020-1)；甘肃省现代农业科技支撑体系区域创新中心重点科技项目(2019GAAS46)。