Theory of "แกล้งดิน" due to the initiative.King"s royal visit people in Narathiwat Province in 2002. 2524 ทรงพบ that after induction water from peat swamp areas to space and to alleviate flooding farming. Showed that the soil in the area is transformed into a swamp of acid sulfate soil, crop, ineffective.Modification of an acid sulfate soils Due to the special soil organic matter and soil depth 1-2 level meters, gray and blue, which is sulfur compounds. " Compound pyrite is very much, so when the soil is dry and pyrite will react with the air, liberate sulfuric acid. Make the soil into soil acidity or sour Center for the study of political resulting from the initiative. Therefore, the Royal โครงการแกล้งดิน response.
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