A METHOD OF CAPABILITY EVALUATION FOR UPLAND SOILS : I. Assessment of Available Water Retention Capacity
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概要
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In view of the increasing importance of uplands as the place for new reclamation throughout monsoon Asia, methods to evaluate different aspects of upland soil capabilities are urgently needed. The methods should aim at quantitative evaluation and practical applicability. The samples to be used in this series of studies were collected from upland fields under cultivated crops and grasses. They include both volcanogenous soils (mainly ando soils) and non-volcanogenous soils (regosols, pseudogleys, acid brown soils, red and yellow soils, etc.). In the present paper available water retention capacity (AWC) of a soil was predicted both from the routine laboratory data and from the characters observed in the field. First, the multiple regression of AWC on such routine laboratory data as bulk density (BD), humus, CEC and textural separates (CS, FS, TS, Silt, Clay) was studied for the entire set of samples. BD showed by far the highest contribution to AWC. Humus, CEC, and total sand (TS) made slight contributions but their partial regression coefficients were significant. Therefore, the final regression equation was AWC=103.74-0.61^<**> BD-0.09^<**> TS-0.31^* CEC+0.57^* Humus for which the multiple correlation coefficient (R)=0.91. For predicting AWC from field characters, Hayashi's theory of quantification was used. The variables tested are field humus rating (FOM), field texture (FTEXT), structure development (STRD), moist consistency (MCON), dry consistency (DCON), compactness (CMPT), etc., besides bulk density (BD), which was included because of its importance and easiness of its measurement even in the field. Finally AWC was shown to be predictable with R=0.90 from BD (4 categories), FOM (3 categories), and CMPT (3 categories). Similar analyses were done for variously stratified samples to check the reproducibility (or repeatability) of the above results. Both regression analysis and Hayashi's theory of quantification No. 1 yielded satisfactory results.
- 社団法人日本土壌肥料学会の論文
著者
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Suh Yoon-soo
Faculty Of Agriculture Kyoto University
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Kyuma Kazutake
The Center For Southeast Asian Studies
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KAWAGUCHI Keizaburo
Faculty of Agriculture, Hokkaido University
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Kawaguchi Keizaburo
Faculty Of Agriculture Kyoto University
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Kawaguchi Keizaburo
Faculty Of Agriculture Hokkaido University:faculty Of Agriculture Kyoto University
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