SOIL MATERIAL CLASSIFICATION FOR PADDY SOILS IN JAPAN
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概要
- 論文の詳細を見る
In view of the importance of soil material characteristics in determining paddy soil capability, a method of classification for soil materials was proposed. In working out the method special attention was paid to making it practically applicable, for the need is great for such a method of ready practical applicability especially in the alluvial soil areas in which most Japanese paddy soils occur.An X-ray fluorescence spectrographic method for the total chemical analysis of soil materials proved satisfactory for routime use in terms of accuracy and time. Nine major elements (Si, Fe, Al, Ca, Mg, Mn, Ti, K, P) were analyzed and they were taken to represent the chemical nature of the soil material. The total chemical composition was combined with mechanical composition and subjected to data processing.To avoid redundancy in information, 2 mutually independent principal components were extracted, which appear to represent different aspects of soil material features. From the 2 principal component scores taxonomic distance was computed as a similarity coefficient for use in numerical taxonomy.By means of numerical taxonomy 8 soil material classes were set up, each of which was characterized in terms of texture, base status, weatherable mineral reserve, etc. In order to facilitate objective placement of a new sample into one of the classes set up, discriminant function were derived for all pairs of the 8 material classes. A figure showing the discriminant space that corresponds to the discriminant functions was prepared to make the paractice of discirmination easy.The 8 soil material classes appear to represent major varieties of paddy soil materials in Japan. The use of the soil material classes as a basis of "soil family" separation in soil surveys would improve the homogeneity of the lower taxonomic units ("soil series") and make their interpretation easier and more correct in relation to soil capability assessment.
- 社団法人日本土壌肥料学会の論文
著者
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Kyuma Kazutake
The Center For Southeast Asian Studies
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KAWAGUCHI Keizaburo
Faculty of Agriculture, Hokkaido University
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Kawaguchi Keizaburo
Faculty Of Agriculture Hokkaido University:faculty Of Agriculture Kyoto University
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