King's royal visit a village in Narathiwat Province in 2009.He found that 2524 After an induction water from peat swamp area to area agriculture is used and relieve flooding. Showed that the soil in the area is transformed into a swamp of acid sulfate soil, crop, ineffective.. consider to improve the area with water soaked in tomorrow year benefit of agricultural and provide the most impact on the ecosystem with metamorphism is acid sulfate the level 1-2 meters depth and soil is Iain gray and blue, which is sulfur compounds called compound pyrite (Pyrite:FeS2), so when the soil is dry. Of pyrite reacted with sulfuric acid air release. Make the soil into soil acidity or sour Center for the study of political resulting from the initiative."แกล้งดิน" to study the changes in acidity of the soil, starting from how to turn. "" แกล้งดิน energy by making the soil dry and wet times. To accelerate chemical reactions of the soil.Free sulfuric acid. Soil acidification till a step. "แกล้งดิน sour extreme". It got to the point that plants can not grow can then find ways to improve the soil able to plant.