Chemical properties of Akahoya soils [in southern Japan]
1993
Nagatomo, Y. (Miyazaki Univ. (Japan). Faculty of Agriculture) | Tamai, M.
In this investigation, the chemical analysis of Akahoya soils collected from eighteen representative profiles in Kyushu and Tanegashima districts was done for knowing the relationship between the chemical properties and the depth from the land surface of Akahoya. Akahoya soils can be divided into three types of group by the depth from the land surface. Type I, Type II and Type III of Akahoya are buried at less than 1.5 m, about 2-4 m and 3-7 m from the land surface, respectively. 1) Both pH (H2O or KCl) and base saturation of Akahoya soils increased with increasing the depth from the land surface in the order of Type I Type II Type III. 2) Type I of Akahoya soils showed weak exchange acidity and low pH (H2O) while Type II and Type III showed strong exchange acidity and high pH (H2O0. 3) Positive relationship existed between organic carbon content and clay content of Akahoya soils. 4) CEC of A horizon of Akahoya soils increased with increasing organic carbon and clay contents, whereas CEC of B and C horizon of Akahoya soils remained constant in spite of the decrease in the clay contents which were in the order of Type I Type II Type III. 5) The greatest amount of Ca and the highest base saturation were found in the A horizon of deeply buried Akahoya soils (Type II) lying under the thick pumice layer
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