The adsorption and desorption of organic and inorganic phosphorus in the three types of paddy soils were studied in the lab experiments. The results showed that the maximum adsorption capacity both to monopotassium phosphate and inositol hexaphosphate from big to small were: red loam soil, stagnic anthrosols, loamy sand soil, and adsorption capacity of organic phosphorus was larger than that of inorganic phosphorus. The adsorption of organic and inorganic phosphorus could be fitted well by equations of Langmuir, Freundlich and Temkin. The Langmuir equation was the best for the fit of inorganic phosphorus adsorption. The Temkin equation was the best for the fit of organic phosphorus adsorption. The desorption of organic and inorganic phosphorus correlate exponentially with the adsorpted phosphorus. The desorbed phosphorus from big to small was loamy sand soil, stagnic anthrosols, red loam soil. The adsorption was affected by the ionic strength of the sorption solutions.
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