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Changes in chemical and physical properties under the process of soil structure development in the heavy clay soil of hachiro gata polder



Changes in chemical and physical properties under the process of soil structure development in the heavy clay soil of hachiro gata polder



Bulletin of the Akita Prefectural College of Agriculture (13): 1-50



In heavy clay soil of Hachiro-gata [Japan] polder, very coarse blocklike or prismatic structures have been observed in the Bg horizons. The shape, size, degree of the development of the structures and their arrangement in the horizons (proceeding the soil-structure formation) differed widely with respect to the drainage conditions. The study were carried out for ten years from 1974 to 1983. Five kinds of fields differing in drainage conditions, were used for the present study with double, paddy fields, plowed lands, grasslands, fruit gardens and Phragmites fields. Schematic representation of the profiles used for this study, are widely divided into three horizons of Ap-Bg-G. Apparently there is a close relationship between the improvement in the chemical and physical properties of soil, especially consistency and the development of soil structures in the Bg horizons. Furthermore, this study was able to clarify that the degree of structures in the Bg horizons in one of the most important indexes for determining the land productivity which is the most significant factor for the Hachiro-gata reclaimed land being used for agricultural purposes.

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