The layer-silicate clay mineralogy of paddy soils of the regions of Fukuokashi-kinko, Chikushi-heiya, Chikuho, Chikuzen-hokubu, and Chikuzen-seibu situated in the northwestern to central parts of Fukuoka prefecture, Kyushu, was investigated to complete the clay mineralogical analysis for the paddy soils of Fukuoka prefecture. The paddy soils of the regions of Fukuokashi-kinko, Chikuho, Chikuzen-hokubu, and Chikuzenseibu which are derived from granitic material were characterized by the low clay content (<300g kg^<-1>) and by kaolin mineral as the predominant clay mineral (50-70% in the clay fraction). The paddy soils of the region of Chikushi-heiya which are derived mainly from crystalline schist contained relatively high amounts of chlorite and clay mica in the clay fraction. Regional distribution of the clay mineralogical composition is helpful to make a clay mineralogical map of Fukuoka prefecture for the evaluation of potential paddy-rice production and of the soil-conserving ability.
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