Technical Classification of the Clay Mineralogical Composition of Paddy Soils Using Multivariate Analysis in Reference to Rice Production

概要

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Clay mineralogical analysis of paddy soils in Nagasaki Prefecture indicated the presence of smectite, vermiculite, clay mica, chlorite,, 2 : 1 mineral-chlorite intergrade, and kaolin mineral. The application of Q-mode factor analysis to the paddy soils using the contents of 6 minerals in the clay fraction and the clay content of the soil as variables enabled to classify 71 paddy soils into 4 groups including 10 subgroups. Group I (23 soils) was dominated by smectite, group II (14 soils) was high in intergrade or vermiculite followed by kaolin mineral, group III (20 soils) was dominated by kaolin mineral, and group IV (14 soils) was characterized by a low clay content. The groups were correlated with the rice yields of 1982, 1983, 1985, and 1986. A high positive correlation was observed with the year with optimum weather conditions, and the yield generally increased in the other of group IV < III <,, II < I soils. The yield of the group I soils varied from year of year, depending on the weather conditions, while the yield of the other groups was not appreciably different between the years but varied considerably within the groups. The distribution of the groups in the prefecture was related to the regional differences in rice productivity.
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