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本文应用蒋柏藩、顾益初提出的石灰性土壤无机磷分级体系，对黄淮海平原鲁西北地区土壤进行研究。结果表明，不同施肥与耕作对土壤有效磷和缓效态磷均有不同程度的影响，而与无效态磷关系不大。长期定位试验证实化学磷肥施入土壤后，绝大部分以缓效态Ｃａ－Ｐ、Ａｌ－Ｐ、Ｆｅ－Ｐ等形式存在，而没有发现缓效磷有进一步向无效态磷转化的迹象。各种形态缓效磷与土壤有效磷之间均达极显著水平，是作物所需磷素的重要来源。因此可以认为，石灰性土壤基本不存在磷的实质性固定问题。
In this paper, Jiang Baofan, Gu Yushi initial lime soil inorganic phosphorus grading system, the Huang-Huai-Hai land in northwestern Shandong soil research. The results showed that different fertilizations and tillage had different effects on soil available phosphorus and slow-acting phosphorus, but not on ineffective phosphorus. Long-term experiment confirmed that chemical phosphate fertilizer applied to the soil, the vast majority of slow-acting state Ca-P, Al-P, Fe-P and other forms exist, but did not find any slow phosphorus to ineffective phosphorus conversion signs. Various forms of slow-release phosphorus and soil available phosphorus reached an extremely significant level between the two, is an important source of phosphorus required for crops. Therefore, it can be considered that there is almost no substantial problem of phosphorus fixation in calcareous soils.