Evaluation of Crusting Susceptibility of Some Japanese Soils Based on Water Permeability and Morphology of Crusts
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概要
- 論文の詳細を見る
Crusting susceptibility of 19 soils collected from upland fields in Hokkaido, Kinki, and Shikoku districts was evaluated based on microscopic observations, morphological parameters using the thin section-image analyzing technique(Tanaka and Kyuma 1992: Soil Sci.Plant Nutr., 38, 369-373)and water permeability after subfecting the samples to simulated rainfall. The morphology of the soil surface after the simulated rainfall tratment was classified into four types: type A with less disintegrated aggregates, thus, less crusted; type B with a relatively dense band, so-called "washed-in layer" (McIntyre 1958: Soil Sci., 85, 185-189), composed of disintegrated small aggregates at a few millimeters below the surface; type C with densely compacted layer and a "seal skin" (McIntyre 1958: Soil Sci., 85, 185-189)composed of disintegrated fine particles at the surface; type D with morphological features similar to those of type C but lacking a "seal skin." Water permeability parameter, -log K value, showed a high correlation with aggregate instability, r=0.815^<**>(n=19), in accordance with the morphological types of crust. Morphological parameter(Tt/APt ratio)was also correlated with the -log K value(r=0.656^<**> n=19)and aggregate instability(r=0.517^<**> n=19). Among the parameters, the water permeability(-log K value)was considered to be a suitable and practical measure for determining the degree of crusting, and, therefore, for comparing the crusting susceptibility among the soils. Based on the -log K value, the potential crusting susceptibility of soils studied decreased in the following order: type C>type D≫type B>type A.
- 社団法人日本土壌肥料学会の論文
著者
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Tanaka U
Grduate School Of Agriculture Kyoto University
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Tanaka Ueru
Faculty Of Agriculture Kyoto University
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Yokoi Yoshio
Central Agricultural Experimental Station
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Kyuma Kazutake
School of Environmental Science, The University of Shiga Prefecture
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Wada Tetsujiro
Faculty of Agriculture, Kyoto University
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Adachi Idemitsu
Faculty of Agriculture, Kyoto University
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Kyuma K
Faculty Of Environmental Science The University Of Shiga Prefecture
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Yokoi Y
Hokkaido Central Agricultural Experiment Station
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Wada Tetsujiro
Faculty Of Agriculture Kyoto University
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Adachi Idemitsu
Faculty Of Agriculture Kyoto University
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