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采用连续流动交换技术研究了我国北方25个供试土壤非交换性钾的释放速率、结果表明，土壤非交换性钾释放缓慢，而持续时间长；最大释放速率变幅为0．195～2．30mg／（kg·min），600分钟平均释放速率变幅为0．066～1．12lmg／（kg·min），释放持续时间一般在600分钟以上。在600分钟释放时间内非交换性钾释放百分率变幅在5．4％～39．6％之间。土壤非交换性钾释放速率与盆栽耗钾试验中玉米吸钾量之间有极显著的相关性，可以用它作为土壤供钾能力的评价指标。
The continuous flow exchange technology was used to study the release rate of non-exchangeable potassium in 25 soils in northern China. The results showed that the non-exchangeable potassium released slowly and sustained for a long time. The maximum release rate ranged from 0.195 to 2. 30mg / (kg · min), 600 minutes average release rate amplitude of 0.066 ~ 1.12lmg / (kg · min), the release duration is generally 600 minutes or more. The percentage of non-exchangeable potassium released within 600 minutes of release ranged from 5.4% to 39.6%. There was a significant correlation between non-exchangeable potassium release rate and K uptake in pot-fertilization pot experiment, which could be used as an index to evaluate soil potassium supply.