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本文从1979－1993年研究了长期定位施肥对津郊潮土磷素组成及其演变规律的影响。结果表明潮土磷的组成以无机磷为主，其中又以磷酸钙盐最多，其次是闭蓄态磷酸盐，而磷酸铝盐与铁盐所占比例很少。长期定位施肥对潮上速效磷影响显著，变幅也最大，并以化肥的影响高于有机肥。研究表明，化学磷肥的施用与原则显著地左右着速效磷的升降，在平均施人或亏缺磷素45kg／ha左右时，则土壤速效磷约升降1mg／kg。潮土速效磷的累积与下降呈现阶段性，一般开始1－2年变幅大，其后6－8年时间保持稳定变化，当升降到某一定值后，变化显著变小。小麦、夏玉米连作每公顷产11400公斤，平均每生产100公斤籽实，施磷1．2公斤，在15年中可保持土壤磷素平衡。
This paper studied the effects of long-term fertilization on the composition and evolution of phosphorus in the alluvial soil of the Jin suburb from 1979 to 1993. The results showed that the composition of the phosphorous in the alluvial soil was inorganic phosphorus, with the most calcium phosphate, followed by the phosphate in the closed state, while the proportion of aluminum phosphate and iron salt was very low. The effects of long-term fertilization on available tocopherol in tide were significant, with the largest fluctuation range, and the influence of chemical fertilizers was higher than that of organic manure. The results showed that the application and principle of chemical phosphate significantly influenced the increase and decrease of available phosphorus, and the average available phosphorus in soil increased about 1 mg / kg when the average applied or deficient phosphorus was about 45 kg / ha. The accumulation and decline of readily available P in the tidal soil show a periodical change. Generally, the amplitude changes greatly in the first 1-2 years and then changes steadily in the next 6-8 years. When the value rises to a certain value, the change becomes noticeably smaller. Wheat and summer maize were intercropped with 11,400 kilograms per hectare, yielding an average of 100 kilograms of seed and 1.2 kilograms of phosphorus. Soil phosphorus balance could be maintained for 15 years.