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In the case of Japanese rice crop, the crop of rice per unit in snowing regions on the side of the Japan Sea is higher than that on the side of the Pacific Ocean.
In particular, we can have a good harvest in a heavy snowfall-year.
In the snowing regions on the side of the Japan Sea, although only one time of rice crop is executed a year, the crop quantity is far greater than that of a triple cropping region.
It's supposed that
・ Weathered volcanic ashes such as green tufas plentifully distributed on the side of the Japan Sea work as a kind of fertilizer.
・ Nitrogens brought by snowfall as well as the climate of hot and high humidity in a summer season proper to this region influence the soil.
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