在定西地区试验观察了有机肥氮替代部分化肥氮对马铃薯生长发育和产量的影响。结果表明，施用有机肥能够显著提高马铃薯地上部生物量和块茎产量，在定西地区，施肥量为N 180 kg/hm2，N、P2O5、K2O质量比为4∶3∶3时，有机肥氮替代化肥氮的比例为30%，是最佳施肥方案。

The effect of nitrogen of organic fertilizer replaces partial nitrogen of chemical fertilizer on potato growth and yield was studied in Dingxi area. The results showed that the biomass and tuber yield of potato above ground could be significantly increased by applying organic fertilizer. In Dingxi area， when the fertilizer amount was N 180 kg/hm2 and the mass ratio of nitrogen， phosphorus and potassium was N∶P2O5: K2O was 4∶3∶3， the best fertilization method was to replace nitrogen with organic fertilizer by 30%.

S532

甘肃省新型肥料创制工程实验室开放基金(GSXFL-2018-02)。