马铃薯是一种需肥较多的作物。结薯期是马铃薯的需肥高峰。马铃薯在生育期吸收钾最高,氮次之,磷较少,属喜钾作物,据有关资料,每生产100kg马铃薯,需从土壤中吸收N 0.5 kg,P2O5 0.2 kg,K2O 1.1 kg。磷、钾肥多作基肥或种肥施入,而氮肥作追肥或70%做基肥,30%作追肥。海原县土壤富钾,含钾量在200 mg/kg左右。而农民施氮比较盲目,过量施氮和基追施比例不当的问题比较突出。 Potato is a fertilizer that needs more fertilizer. Potato tuber is the peak needs of manure. Potato has the highest absorption potassium in the growth period, followed by nitrogen and less phosphorus. It is a potassium-like crop. According to relevant data, it needs to absorb N 0.5 kg, P2O5 0.2 kg and K2O 1.1 kg for every 100 kg potato produced. Phosphorus, potassium and more fertilizer for basal or seed application, and nitrogen fertilizer for top dressing or 70% to do basal, 30% for topdressing. Haiyuan County soil potassium, potassium content of about 200 mg / kg. However, peasants are relatively blind with nitrogen fertilizer, and the problems with excessive proportion of nitrogen and improper top dressing are obvious.