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通过１９９５年对河南省濮阳市五县一区１０００个土样的化验，发现濮阳潮土各类质地土壤速效钾含量较１９８５年均有大幅度下降，目前该区有７２．１％的土壤需施钾肥。经过１９９１～１９９５年连续５年的小麦、玉米、大豆、红薯、水稻钾肥肥效试验，提出小麦、水稻的最佳施肥时期和每种作物在各类质地土壤的最佳钾肥用量。
Through the test of 1000 soil samples from five counties and one district in Puyang City of Henan Province in 1995, it was found that the available potassium content of soils in Puyang soils varied greatly compared with that in 1985. At present, 72.1% Potash fertilizer. After five years of continuous application of fertilizers of wheat, corn, soybean, sweet potato and paddy from 1991 to 1995, the optimal fertilization period of wheat and rice and the best potash application amount of each crop in soil were put forward.