PHOSPHATE FIXATION BY ANDO SOILS DIFFERENT IN THEIR CLAY MINERAL COMPOSITION
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概要
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The phosphate fixation capacity at pH 4.5 and an equilibrium concentration of 250 mM phosphate was measured. The soil samples were divided into five groups according to their clay mineralogical composition. The first group soils contain opaline silica and allophanelike constituents, and some unidentified minerals, the second opaline silica and crystalline layer silicates, the third opaline silica and crystalline layer silicates with additional allophanelike constituents or alumina-rich gel-like materials, the fourth allophanelike constituents, allophane and imogolite and the fifth crystalline layer silicates, allophanelike constituents and alumina-rich gel-like materials, plus some halloysite-like minerals, respectively. The first group soils had phosphate fixation capacities of 3,000 to 8,000,the second group soils 1,000 to 3,000,the third group soils 2,000 to 13,000,the fourth group soils 8,000 to 15,000 and the fifth group soils 5,000 to 12,000 mg P_2O_5/100 g oven-dry soil, respectively. The fourth group soils in which allophane and imogolite predominated showed the highest phosphate fixation capacity. The fractions which dissolved from almost all soil samples by treatments with 6% H_2O_2,Na_2S_2O_4-NaHCO_3-Na citrate and 2% Na_2CO_3 were estimated to have very high phosphate fixation capacities (8,000 to 19,000 mg P_2O_5/100 g dry-matter), and there was not much difference among the soil samples examined. Iron and aluminum combined with humus, allophanelike constituents, alumina-rich gel-like materials and halloysite-like minerals in addition to allophane and imogolite contribute to the phosphate fixation of Ando soils.
- 社団法人日本土壌肥料学会の論文
著者
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MIZOTA Chitoshi
Faculty of Agriculture, Iwate University
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Mizota Chitoshi
Faculty Of Agriculture Iwate University
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Mizota Chitoshi
Faculty Of Agricultuer Iwate University
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