The effect of Baido-pushing-up the soil aside the hill-upon the growth of rice plant and its rotation crops in ill-drained paddy fields

Abstract

1. In order to know the effect of Baido, a practice to push up the soil aside the hil1, upon the growth of rice plant and of following crops in rotation on ill-drained paddy fields, investigations were carried out in the field of the Hokuriku Agricultural Experiment Station. 2. The best time for Baido practice was 33 days prior to heading ; i.e. the time when fruitful tillerings had developed, and when it was delayed, the crop yield decreased owing to the unrecoverable injuries of roots. 3. Increase of yield caused by the Baido method may be analyzed as follows : (1) Retardation of the development of unfertile tillerings. (2) Delayed formation of lysigenous aerenchyma, indicating checked decay of root because of high oxidation-reduction potential of soil. (3) Lessening the damages by sesame spot and stem rot.(4) Deep development of root system and increased number of roots. (5) The healthy growth and development caused by larger diurnal fluctuation of soil temperature. 4. The favorable effects of Baido not only upon the rice plant, but also on the rotation crop ascribable to the good aeration of soil were observed.