抄録
In 1993 there were cool summer damages of some crop yields. Especially the damage of rice yield was serious, crop situation indices of rice yield were 74 in the whole country, 28 in Aomori prefecture, 30 in Iwate prefecture, 38 in Miyagi prefecture and 40 in Hokkaido prefecture. Those crop situation indices were the worst since 1945. The difference between in 1993 and in normal year of the mean temperature from the middle of July to the middle of August was the largest among the summer season in 1993, that was -4.0〜—4.3 in Aomori prefecture, Iwate prefecture and Miyagi prefecture. There are many protection methods for cool summer damage of crops. The physical protec-tion method is achieved by changing the volume of heat budget items ; sensible heat, latent heat and soil heat. Wind breaks and deep flood irrigation are the main actual methods. The effects of those protection methods are discussed. Also, the achieving problems of the protection methods are discussed here.
