We have just purchased a few rai of what is essentially hill land, near Ban Chang (Rayong). The soil is extremely sandy, and there is currently cassava (man sahm bpa lang), growing. Not being farmers, once this has been harvested, we would like to plant trees, to prevent, as much as possible, soil erosion. Obviously, the requirement is for trees with roots which will spread well and provide a good key to the ground. Can any TD members please assist and come up with practical suggestions? We will shortly be commencing building a new home, near the peak of this land, so the preservation of the soil is of particular importance.