The present paper mainly deals with the phosphorus status of the soils in the suburbs of Shanghai. Two different methods were employed to extract the different forms of phosphorus in the soils. The results obtained showed that inorganic phosphorus comprised about 90% of the total phosphorus, and of the inerganic phosphorus calcium phosphate accounted for more than 50% . 70--80% of calcium phosphate took the forms of rock phosphate.
Moreever, determination of the transformation of phosphorus in pa...