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研究了豫北潮土区在小麦 玉米轮作周期内不同施钾水平上作物的产量效应与土壤钾素的动态变化。结果表明：供试土壤施钾后不仅提高耕层土壤速效钾含量，而且也很快向缓效钾方向转化，转化量随钾肥用量的提高而增大。整个轮作周期内土壤速效钾及缓效钾含量与施钾量之间呈显著正相关关系。转化为缓效钾的肥料钾比土壤原有缓效钾更易释放，有效性较高。施钾对小麦、玉米都有显著增产效果，以小麦、玉米２ 季各施钾素２００ ｋｇ／ｈｍ２ 左右为宜，不仅可获理想的作物产量，而且可有效地提高土壤钾素含量和供钾水平。
The crop yield and soil potassium dynamics in different soil potassium regimes in wheat maize cropping cycle in the tidal region of North Henan were studied. The results showed that potassium fertilization not only increased the content of available potassium in topsoil, but also quickly converted to slow-acting potassium. The amount of conversion increased with the increase of potassium application. There was a significant positive correlation between soil available potassium and slow-acting potassium and potassium fertilization in the whole rotation cycle. Potassium, which is converted to slow-acting potassium, is more easily released than the slow-available potassium from the soil, and is more effective. Potassium application had significant effects on yield increase of wheat and maize. Using potassium (200 kg / hm2) in wheat and maize in the second season was not only suitable for crop yield, but also could effectively increase soil potassium content and potassium supply Level.