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采用逐级去磷的土壤研究在好气与淹水条件下猪粪、稻草和纤维素对土壤中不同形态磷的活化作用。结果表明，在好气条件下，猪粪、稻草和纤维素均能对土壤中各种形态的无机磷起活化作用，其效果为猪粪＞稻草＞纤维素。在淹水条件下，有机肥则表现为明显增加土壤对磷的固定，这主要是土壤中的铁氧化物强烈吸附磷所致。但当土壤去除Fe－P和O－P后，有机肥则能对土壤磷起明显的活化作用。采用人工合成磷酸铁加入去磷、去铁氧化物土壤的试验表明，有机肥对磷酸铁的活化率可高达30％。由于土壤中存在的铁氧化物对活化的磷起掩盖作用，因此，有机肥对土壤磷，尤其对Ca2－P、Ca8－P、Al-P和Fe－P的实际活化作用有可能比测定值还要高。
Soil was used to study the activation of different forms of phosphorus in pig manure, straw and cellulose under aerobic and flooding conditions. The results showed that under aerobic conditions pig manure, straw and cellulose all activated inorganic phosphorus in soil, and the effect was pig manure> straw> cellulose. Under flooding conditions, organic manures showed a marked increase in soil P fixation, mainly due to strong adsorption of phosphorus by iron oxides in the soil. However, when Fe-P and O-P were removed from the soil, organic fertilizers could obviously activate soil phosphorus. Addition of synthetic ferric phosphate to dephosphorization and de-ferrite soils showed that the activation rate of organic ferric phosphate to ferric phosphate could be as high as 30%. The actual activation of soil P, especially Ca2-P, Ca8-P, Al-P and Fe-P by organic manures may be more probable than the measured values due to the masking effect of iron oxides present in the soil on activated phosphorus But also high.