Studies on Improvement of the Damp Rice-Fields in Sasayama Basin 4 : Melioration effects on a damp rice-field under the control of the ground water level

摘要

Digging a shallow well in a damp rice-field for the purpose of pumping up the surplus water therein, we surveyed the ground water level and exercised an experiment on the effects on the second crops and on the physical properties of the soil therein which