抄録
Actual soil erosion and conservation practices were observed over two years on two differently shaped farm
fields which had been reclaimed into two types, one had a slightly graded side, the other had two graded sides,
but the same slope gradient and the same soil of decomposed granite.
The field observations showed that soil erosion occurred along the flow ends of furrows in a field and that
soil loss was decreased after proper conservation practices leading the flow to a stable waterway directly. On
the fields of the two graded sides type, however, furrow erosion was accelerated by ridging and so conservation
practices became harder because the flow was obstructed by sedimentation and thick sod along a waterway.
Sustainable agriculture in reclaimed land of decomposed granite soil needs feasible conservation practices
and stable fields easy to control soil erosion year by year. From these viewpoints, farm fields with a slightly
graded side are suggested to be superior to the others.
