土壌構造に関する研究(第3報) : 日野土壌の土壌水について

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In this paper the authors investigated the transition of the soil water, according to the difference of the soil structure, in the Hino-soils from the fields where the cultivation, were made with grass or without grass. The experiments were concerned in PF : of PF, 1.0〜4. 5 and 1.0〜3.0 were measured by the direct method using the manometer and the BUCHNER funnel; 3.0〜4. 2 by the method of fleezing point decrease; and 4. 2〜4. 5 by the gas adsorption apparatus. The results were summarized as follows; 1) Soils from field with grass (Fig.) : On the top-soil (2nd-layer), the PF-water content curve had the shape of wave; that is, soil water, corresponding to the gravitational water, decreased rapidly from PF 1.6 to PF 2.0; but, it decreased very slightly between PF 2.0 and PF 2.7,very rapidly from PF 2.7 to PF 3.2 and then the rate of decrease was slow between PF 3. 2. and PF 4.5. These phenomena were considered to be due to the specific quality of the aggregated soils; and the water that was most effectively absorbed the plant root was contained very much in these soils. But on the top-soil (1st-layer) and the sub-soil, the PF-water content curves were monotonic through all ranges from the gravitational water to the capillary water, owing to the results that the structure was of single grain and also the water holding capacity was little. 2) Soils from the field without grass (Fig.) : The PF water content curves were monotonic, both of the top-soil and the sub-soil, the gravitational water between PF l.6 and PF 2.0,and the capillary water between PF 2.7 and PF 3.2 were less than that of the top-soil (2nd-1ayer) of the soils from the field with grass. It seemed in spite of the good chemical properties, the top-soil was expected to have a single grain's structure, so that it caused the bad condition of the soi1 or water supply to plant root. 3) Soils from uncultivated field (Fig.) : of the top-soil (2nd-layer), the PF-water content curve was resemble to that of the top-soil (2nd-layer) of the soils, from the field with grass. The structure of this soil was better than that of the top-soil of the soils from the field without grass.
1955-12-05

土壌構造に関する研究(第3報) : 日野土壌の土壌水について

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