Influence of typhoon on the paddy rice production in Kyushu and Yamaguchi districts in 2004 and salty wind damage of rice caused by typhoon 0418 (SONGDA)

Abstract

Five typhoons (No.15·16·18·21·23) approached and landed from booting to harvesting time in Kyushu and Yamaguchi districts in 2004. The grain yield and quality of paddy rice were deteriorated by the strong wind accompanying these typhoons. This was considered to have been caused by the decrease of photosynthetic capacity, lodging, defect of ripening and viviparity. The crop situation index was 70 in the Minami-Chikugo, Fukuoka Prefecture, 74 in the northern part of Kumamoto Prefecture, and 76 in the western part of Yamaguchi Prefecture and Saga Prefecture. In the Yamaguchi, Fukuoka and Kumamoto Prefectures, the quality of rice deteriorated markedly, and there was only 13-15% grade rice. There was little rainfall after the passage of the typhoon in the Suo Sea coastal region of Yamaguchi Prefecture. Consequently, the adhering salt entered the rice plants, and damaged the plants resulting in reduced yield and inferior rice quality.