The major soil constraints for rice cultivation are extreme acidity, lowcation exchange capacity,
toxicity of Al and micronutrients and low P. Al, Fe and Mn toxicities are common in acid sulfate soils. Among
the P fractions, the distribution of inorganic P forms in the soils was in the order of Fe–P N Al–P N Reductant
soluble-P N loosely bound P (Saloid-P) N Ca–P. These findings indicate that soil reclamation with liming and a
good fertilizer management program is essential to boosting rice production in potential acid sulfate soils.