Alterations of pH and exchangeable Al by liming in the acidic soils of Okinawa and Java Islands

概要

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This study was aimed to investigate the alterations of pH and exchangeable Al on the liming in the acidic soils developed in Okinawa and Java Islands. Eleven surface and subserface soil samples were collected. Modification of pH was accomplished by incubating soils for three weeks with CaCO_3 at the expected pH of 5.0, 5.5, 6.0, 6.5, and 7.0. Exchangeable Al was extracted by 1 MKCl, and the pH of soil in water and 1 M KCl (1:2.5) was measured. Okinawa soils were characterized with variable in clay content (which almost lower than Java soils), predominant illite and halloysite clay minerals, relative low in exchangeable Al and in buffering capacity. The Java soils were two types of (i) Java I soil with predominant clay mineral of 2:1-2:1:1 intergrade mineral (with smectite as 2:1 type mineral) and high content of exchangeable Al, and (ii) Java II soils with predominant clay mineral of kaolinite and relatively low content of exchangeable Al. The first soil required larger amount of lime to correst the pH and to depress the exchangeable Al than the second. Reflecting their clay content, dominant clay mineralogy, and content of exchangeable Al, it is concluded that the content of exchangeable Al and the buffering capacity upon the lime application of the studied acid soils is in order: Okinawa soils <Java II soils <Java I soil.
日本ペドロジー学会の論文
1997-12-31