2. Conservation and restoration of soil.King"s son of God and the more important in conservation and restoration of soil. With the natural conditions and different problems in each region. By written in royal documents. "The land suitable for agriculture, must be qualified, such as a mineral called fertilizer composition is an important 1) N (nitrogen). In the form nitrate 2) P (phosphorus) in the form phosphate 3) K (potassium) and other minerals O H Mg Fe levels, sour, alkali, near neutral. (pH 7) has low salinity, microorganisms, humidity appropriate (not dry, not wet) with appropriate transparency (solid) "the initiative in solving problems of land especially picky. In order to solve the problems such as the research of saline soil, acid, Sandy in central and northeastern, the peat soil in southern and coastal land The improvement and restoration of degraded soil erosion from soil erosion. As well as the demonstration of agricultural land in the area with the soil degradation. To keep the area with soil problems from various causes, returned to agricultural use again. Continent in the conservation and restoration of soil that is divided into 4 parts.
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