Agriculture is the main occupation in Thailand and it plays an important role in
the economic development of the country. Thailand is located in the tropical
monsoon climate region where the amount of rainfall is high but shortage of
water occurs even in rainy season. Only 20% of total agricultural area is under
irrigation, with rest constituting rainfed area, which has relatively lower crop
yields. High soil erosion and reduced soil productivity are some of the problems
in the rainfed area
