Studies on the methods to lower the high water-temperatures of paddy field in the warn district in Japan

(1) Carbon Black Powdering Method

Abstract

The Carbon-Black Powder was dusted on the water surface in the paddy field to intercept the penetration of solar radiation into the water, and the rice-yields of the Plot were the most among three Expt-Plot. (See Tables 2, 1, & Fig. 1)
The reasons of the results may be as follows:
1) The soil-temperatures were moderate in summer.
2) Few weeds grew in the field for lack of the light in water.
In Straw-Mulching Plot, the fungus diseases occurred and the rice-yields were the least in spite of moderate temperatures of the field.