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采用化学测定和生物耗竭试验，研究不同肥力旱地潮土供钾能力。结果表明：潮土土类的三个土种在土壤供钾强度、供钾容量、供钾潜力、生物吸钾量、连续种植后土壤钾的下降量，均以半夜阴地＞夜阴地＞黄泥翘土壤；而土壤钾缓冲容量、钾最大吸附量的排序则相反。连续密集种植的生物试验结果表明，土壤供钾以土壤缓效钾部分占７８～８９％，而土壤速效钾供钾只占１９～２２％。土壤速效钾降低至一定程度后不会持续下降而维持在耗竭水平值，在临界点以后，主要依赖土壤缓效钾供钾。旱地潮土供钾能力都不能满足作物生长的需要，不施钾肥作物的吸钾受到限制，其含钾量、相对生物产量明显下降，连续施用钾肥能产生较大的增产效应。
The chemical assay and bio-depletion test were used to study the potassium supply capacity of different fertility drylands. The results showed that soil potassium supply, potassium supply potential, potassium uptake by the soil, and soil potassium uptake after continuous planting in the three soils of the alluvial soils ranged from midnight to midnight> night night> Yellow mud soil, while the order of soil potassium buffer capacity and potassium maximum adsorption quantity is opposite. The results of biological experiments of continuous and intensive planting showed that soil available potassium accounted for 78-89% of the soil slow-acting potassium and soil available potassium only accounted for 19-22%. Soil available potassium reduced to a certain extent will not continue to decline and maintained at the level of depletion, after the critical point, mainly dependent on soil available potassium potassium. Potassium supply capacity of dryland soil can not meet the needs of crop growth, potassium-free crops are limited potassium absorption, the relative bioavailability decreased significantly, continuous application of potassium fertilizer can have a larger yield-increasing effect.