Fig. 4 and Fig 5. show that all three types of compost could increase the anion resin exchangeable P and solution P concentration in the soil. However, the effects varied according to the type of soil and the type of compost. In general, straw compost was found to be the most effective in increasing the concentration of P in the soil solution, the resin exchangeable P, the organic P, and the rate of mineralization. This was followed by composted cattle manure, and composted swine, in that order