1990 Volume 30 Issue 2 Pages 115-125
In heavy clay soil of the Hachiro-gate polder reclaimed in 1966, very coarse blocky or prismatic structures are observed in the Bg horizons. The shape, size, degree of the development of the structures and their arrangement in the horizons are depending on the drainage conditions.
The process of soil-structure formation, and changes in the chemical, clay mineralogical, and physical properties of the soil during the process are introduced in this article. Futhermore, I point out the subjects of the soil consolidation at the upper parts in the horizons and water pollution in the Hachiro-gata Residual Lake.
