Trees destroyed for hillside rice cultivation. Rice is grown for 2-3 years on steep slopes, until the soil is exhausted and then the fields are abandoned and more forest land is cleared for new fields. - - Integrated Watershed Management and Forest Land Use Project. The great forests of Thailand are being rapidly destroyed by people desperately in need of land for cultivation. This problem of deforestation is extremely serious for the entire country as Thailand's main water supply is created in these forests of the n