The water and starch content also increased following K rate increased, and both of them reached the highest at 225 kg K2O/hm2. SOp as well as MOP improved yield and starch content of sweet potato.

• 薯块水分和淀粉含量也有随钾肥用量提高而提高的趋势，在K2O为225kg/hm2时达到最高；