黑龙江省水稻生长的实体模型，对两种不同类型的水稻土钾素养分变化进行模拟试验．结果表明，水稻对钾素吸收呈“山峰”式积累曲线；钾素在作物库内积累分布：茎秆＞叶片＞籽实＞根系；土壤库中速效钾动态变化趋势，以抽穗期为界限，前期略高于后期；土壤库内钾素的输出大于输入，属亏损型管理，盈亏量与施肥量呈“单谷状”曲线分布；以图解法求出钾素平衡时的施钾量．同时提出补给土壤库中钾素含量的对策． The physical model of rice growth in Heilongjiang Province was used to simulate the changes of potassium nutrient in two different types of paddy soils. The results showed that the accumulation of potassium in rice showed a “mountain” accumulation curve; the accumulation and distribution of potassium in the crop bank: stem> leaf> seed> root; the dynamic change trend of available potassium in the soil bank, Slightly higher than the later stage. The output of potassium in the soil bank was greater than that of the input, which was a loss-type management. The distribution of profit and loss and fertilizer was single-grain curve distribution. At the same time, the countermeasures to supply potassium in soil pool were put forward.