Abstract
1. In Japan, seeding of winter leguminous plants for green manure or forage use is practiced among rice plants as their after crops. Milk vetch (Astragalus sinicus L.) and common vetch (Vicia sativa L.) are used commonly for this purpose, as they have suited morphological properties for the early growth in such a dark place.
2. Readings of a photocell type solarimeter indicated about 10 per cent of the exterior solar radiation is reached on the ground surface among rice plants, at the end of September.
3. Daily variation of ground surface temperature and relative humidity ranged narrower among the plants than on the bare land.
4. At the end of September, it is favorable to the germination of the seeds broadcasted among the rice plants through the sufficient temperature and humidity maintained in the daytime, and they result similar green yield levels comparing to the bare land culture. But in November, it turn: worse especially about the temperature and their yield is extremely less than the bare land culture.
