ON THE VOLCANIC ASH SOIL IN TOKACHI DISTRICT, HOKKAIDO ISLAND, JAPAN

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Summarizing the results of above observations, the authors are able to state as follows : -1) Each soil sample is sand or sandy loam, but the weight of these soils is relatively low. So, it will be very highly subject to wind erosion.2) The upper plastic limits are smaller than the water holding capacity in each sample. So, the resistance to water erosion will be low.3) The pH values of each sample are neary neutral through all horizon.4) In the surface soil, the content of soluble CaO is high, while that of MgO is low.5) The percentages of Fe_2O_3,Al_2O_3 and CaO soluble in 10% HCl are high compare with the total amounts of each compound, but the percentage is very low for MnO. That of MgO is higher at surface and smaller below.6) Exchange acidities of all samples are small. Samples of II and V which are rich in humus showed high hydrolytic acidity.7) Absorption coefficient for ammonia is almost the same as that of ordinary soil but the values for P_2O_5 are high especially in samples No. V and No. VI.8) Volcanic ash which forms horizons V and VI seems to be derived from different origins than the other layers. In isoelectric points and velocities of electrocataphoresis these samples differ from others.9) The clay minerals which constitute the colloidal fraction of each sample are determined by chemical and physical methods. From the results, the authors conclude that the constituent minerals include such simple oxides as goethite, gibbsite and boehmite and 1 : 1 lattice structured mineral as hydrated halloysite. Moreover, allophane is added to these minerals.
社団法人日本土壌肥料学会の論文
1957-03-27

ON THE VOLCANIC ASH SOIL IN TOKACHI DISTRICT, HOKKAIDO ISLAND, JAPAN

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