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1989-1994年在河南封丘潮土上，对几种主要肥料的效益，以及不同施肥条件对土壤养分供应能力的影响进行了长期定位试验。试验结果表明：潮土的生产潜力很大，贫瘠的潮土单施N肥或P肥收效甚微。只要N、P肥配合施用，其交互增产作用极显著。如一旦停止施肥，产量又将急剧下降到很低水平。在富K的潮土上，连续五年不施K肥和有机肥，对小麦产量尚不构成影响。然而耕层土壤中的速效K以每年3.8mg／kg的速度下降，已接近临界水平。定位试验中测得N、P肥五年的累计利用率远高于单季试验的结果，分别为57.2％和43.8％。在当前施肥模式和产量水平下，大多数潮土中的N、P养分和有机质都略有盈余，而K素养分则普遍亏缺。
1989-1994 in Henan Fengqiu soil, the benefits of several major fertilizers, as well as different fertilization conditions on the nutrient supply capacity of the soil for a long-term positioning test. The test results show that the production potential of alluvial soil is very large, and the fertility of bare barren soil with N fertilizer or P fertilizer alone has little effect. As long as N, P fertilizer with the application, the interaction between the yield increased significantly. Once ceased fertilization, the output will drop sharply to a very low level. In K-rich soil, K fertilizer and organic fertilizer are not applied for five consecutive years, and wheat yield is not yet affected. However, available K in topsoil declined at a rate of 3.8 mg / kg per year, approaching the critical level. The cumulative utilization of N and P fertilizers in the pilot test was much higher than that of the single-season test, 57.2% and 43.8% respectively. Under the current fertilization mode and yield level, N and P nutrients and organic matter in most of the alluvial soils are slightly surplus, while K nutrient is generally deficient.