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肥力定位试验１５年的结果显示：对照和Ｎ处理，土壤速效磷含量随年限逐渐降低；ＮＰ和ＮＰＫ处理土壤速效磷无明显增长；配施有机肥后，土壤速效磷含量显著增加，各处理的增长趋势基本相似，即前６年增长速度较快，第７年后增速减缓，与年限呈曲线相关，表明土壤速效磷具有极值稳定性。有机无机配合是提高黄潮土速效磷水平的有效途径。
The results of 15-year fertilization experiment showed that available phosphorus decreased gradually with the years under the control and N treatments. There was no obvious increase of available phosphorus in soil treated with NP and NPK. With the application of organic fertilizer, the content of available phosphorus in soil increased significantly, The growth trends are basically similar, that is, the rapid growth in the first 6 years, the slowdown in the 7th year, and the curve of the years are curve-dependent, indicating that the soil available phosphorus has extreme stability. Organic-inorganic combination is an effective way to improve available phosphorus in yellow soil.