Using the self-developed HA-K fertilizer and the edible sweet potato variety Beijing 553,the effects of different kinds of K fertilizers on the potassium accumulation dynamic and use efficiency in sweet potato were studied.The results showed that the accumulation of potassium increased with the growth and development of sweet potato,which could be fitted by the Logistic equation.The HA-K fertilizer could significantly improve the agricultural utilization rate and the absorption utilization rate of potassium...