Abstract: To understand the potassium(K)absorption and fertilization of potatoes,an experiment was conducted in Southeast Fujian using the winter potatoes.The results showed that the K accumulation in the entire plant and tuber of the potatoes was a Logistic dynamic curve.The vigorous stage of the absorption occurred during the 14d before squaring to the 15d prior to maturation.In the late stage,the tuber acquired K primarily from the leaves.The potato yield correlated to the amount of K application parabolically.Under the test conditions,the economic K application was determined to be 201.6 kghm-2 with an expected yield of 37424 kghm-2.On the average,to produce 1 000 kg tubers 5.4 kg of K fertilization were required.