EFFECTS OF HYDROXY-ALUMINUM SPECIES, COEXISTING ELECTROLYTES, AND DRYING ON IMPROVEMENT OF SOIL PERMEABILITY BY HYDROXY-ALUMINUM

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The addition of ca. 5 mmol/100 g of Al to a paddy subsoil sample increased its permeability by 3 to 4 times in the order of Al(OH)^<0.53+>_<2.21><Al(OH)^<1.41+>_<1.59><Al(OH)^<2.56+>_<0.44><Al^<3+>. Following the same order, a part of the enhanced permeability was maintained by prolonged washing with water. The enhanced permeability caused by the addition of CaCl_2 alone was not maintained by washing with water, unlike that caused by addition of CaCl_2 together with hydroxy-Al. Drying of the sample to pF⩾ 5 resulted in an increase of permeability by 4 to 10 times and 4 times for the samples both treated and not treated with hydroxy-Al, respectively. This enhancement of permeability was greater and more lasting for Al(OH)^2.56+>_<0.44> than for Al(OH)^0.53+>_<2.47>. The increase of permeability by the addition of hydroxy-Al was greater for the paddy subsoil sample than for the upland subsoil sample, but the effect of air-drying was more marked and lasting for the upland subsoil sample.
社団法人日本土壌肥料学会の論文