硅鉄礬比の意義及び酸処理法の当否に就て

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The following articles are treated in this paper : - 1. Introduction. 2. How are the "primary" weathering products chemically constituted? 3. Are the ferric silicates contained in the weathering products? 4. Are all the "clay complexes" in soils crystalline? 5. Is the "absorption compound theory" completely disproved? 6. The siliceous and less-siliceous clays, and the adventitious ingredients. 7. To what extent has the silica-sesquioxide ratio its significancy? 8. Are the acid treatments of soils to be completely rejected? 9. Supplements (the separation and chemical analysis of clay fraction, etc.) The materials are taken mainly from ROBINSON'S THE SOIL (1932) and partly from MARSHALL'S COLLOIDS IN AGRICULTURE (1935) with the writer's short critical and explanatory notes. The opinions of other authors are also referred at times. The writer remarks that the "crystalline clay theory" is not yet arrived at the position of disproving the older "absorption compound theory" completely, and that the silica-sesquioxide ratio can not adequately be a plied to the majority of our common soils, which are rich in the adventitious sesquioxides, especially in the ferric oxide. The writer is of opinion that the acid treatments of soils have the practical importance in most cases, if they are cautiously done and their results are judiciously interpreted. He, moreover, maintains that the methods of separation and chemical analysis of the "clay fraction" must fully be reexamined and justified, before they are adopted widely in this country.
一般社団法人日本土壌肥料学会の論文
1936-03-25

著者

關豐太郎
農林省農事試験場

硅鉄礬比の意義及び酸処理法の当否に就て

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