Abstract: Incubation test and microplot experiments were conducted to study the transformation of inorganic phosphorus in albic soil.The results show that most part of soil inorganic phosphate was transformed into iron and aluminum phosphates after a short period of incubation (24 hours and 8 davs,respectively),and aluminum phosphate was transformed into iron phosphate after 80 days of incubation.Calcium phosphate changed slightly throughout the whole period.Aclose relationship between inorganic phosphorus transformation and soil properties was found.The transformation process of inorganic phosphorus was changed by applying organic fertilizers,whose reaction with iron and aluminum oxides induced the formation of “organic matter iron phosphate” and “organic matter aluminum phosphate”complexes which can be easily uptaken by crop.

Key words: Albic soil, Inorganic phosphorus fractions, Transformation