马铃薯钾素吸收积累与施用技术

Potassium absorption and fertilization of potatoes

为探索马铃薯钾素吸收积累规律和施用技术,在闽东南冬种马铃薯区设置施K量试验。结果表明,马铃薯全株及块茎的K素积累呈Logistic曲线动态,吸K盛期在现蕾前14 d至成熟前15 d,后期块茎新增K素主要来自叶片的转移。马铃薯产量与施K量呈抛物线型相关,在供试条件下,经济施K量为201.6 kg.hm-2,预期产量为37 424 kg.hm-2,平均每生产1 000 kg块茎需施K 5.4 kg。

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 kg·hm-2 with an expected yield of 37424 kg·hm-2.On the average,to produce 1 000 kg tubers 5.4 kg of K fertilization were required.