抄録
It is recognized that the Mn compound in the paddy soil is easily removed from the furrow slice and accumulated in the subsoil, and that the furrow slice of degraded paddy field is poor in active Mn compound as well as in free Fe_2O_3. In the normal paddy field, Mn is observed to be accumulated in the plow-sole while in the degraded paddy field it is accumulated beneath the Fe accumulated layer. The mechanism of translocation of Mn is also disussed.
