On the Inclosed and Reclaimed Marsh Soil on the Coast of Kyushu.

Abstract

In this paper the Chemical properties of reclaimed marsh soils enclosed by dyke in 1937,is dealt with. 1. The pH-values of surface soils are 7.49〜7.74 and those of subsoils 7.67〜8.52. 2. Although the water soluble ash contents of fairly reclaimed surface soils are about 0.3%, those of still almost unreclaimed surface soils are about 1.2%, and those of all subsoils are about 2.0%. In 100 parts of ash substances NaCl occupy about 80 and sulphates follow that. 3. In 100 parts of exchangeable cations Mg occupy 39.4〜47.4 parts and sums of K and Na are 25.0〜33.8. 4. The silica-alumina ratios of colloidal clays below 1μ in diameter are about 4.8 in surface soils and about 3.7 in subsoils. The colloidal clays in surface soils may contain some quartz.