| dc.description.abstract | In the last few years three have been several studies of the andosols. Since this group of balck-colored soils is widely distributed inthe volcanic areas around the gradually receiving more attention. The unusual behavior of this soils is atributed to their amorphous clay fraction. In japan, according to the literature,a ndosols are often characterized by the presence of allophane (1,6). In new Zealand, however, allophane has been reported (3) as also present in agroup of soils derived from volcanic andesitic and rhyolitic ash, and in Hawaii (9) as present in condiserable amounts in latosols. | id |
