Effects of underdrainage in lowland poorly drained paddy field

Abstract

Abstract The lowland poorly drained paddy field may be handicapped in general, to the better drained paddy field in soil productivity level for rice crops in Japan. This is principally responsible for the prevalence of reducing characteristics in soils because of the high waterlogging condition all the year round. Therefore, the effects of the soil drying treatment on lowland poorly drained paddy field by any drainage are highly significant for the satisfactory production of rice crops. Kobo0 has noted that, among the numerous soil properties changed after drainage of the lowland poorly drained paddy field, the decreases in soil nitrogen level which will be characterized by the stabilization of soil humus are associated most closely with the promotion of the soil productivity. The present study was set up to ascertain the effects of soil drying by underdrainage of the lowland poorly drained paddy field incomparison with the better drained paddy field under cultivation.