Abstract
Tobacco cultivation on slope fields accelerate the water run-off and soil erosion. It is remarkable especially when autum-potatoes are cultured after tobacco crops. It was elucidated by the author's study that sweet potato plants cultured after tobacco crop was very effective to control the water run-off and soil erosion. Sweet potato plants grown directly from seed tubers set on the field showed particularly remarkable effects to control soil erosion compared to the plants grown from transplanted slips, because the former grew earlier and covered up broader areas of the ground than the latter.
