Degradation and Stabilization of Humus in Buried Volcanic Ash Soils : II.Humus Composition in Fractions with Different Particle Sizes
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概要
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There soil profiles located along a toposequence in a sub-humid climatic zone of southeastrn Nigeria were examined and described. Fifteen soil samples collected from them were characterized in order to evaluate their agricultural potentials. The soils were moderately weathered, with strong to medium acidity. Effective cation exchange capacity (eCEC) varied from low to medium. Total N, available P, and organic C were low. Pedons 1 and 2, sited at the crest and middle slope respectively, were well-drained, with dark brown to brown surface/sub-soil colors while profile 3 in the valley bottom was poorly drained, with light brownish grey to light grey colors. The soils showed a mixed mineralogical composition consisting of kaolinite (predominant), mica, goethite, and quartz. Smectite occurred in small amounts in pedon 3. Under the U.S. Soil Taxonomy, the soils were classified as Orthic plinthustalf, coarse, loamy, mixed, isohyperthermic (crest and middle slope), and Typic tropaqualf, coarse, loamy, mixed isohyperthermic (valley bottom). Constraints to higher crop productivity identified included high sub-surface quartz gravel concentrations, presence of argillic horizons, low organic matter, total N, and available P contents. The principal pedogenic processes affecting the properties of these soils were ferrugination, leaching, and lessivage.
- 社団法人日本土壌肥料学会の論文
著者
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Kuwatsuka Shozo
Faculty Of Agriculture Nagoya University
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Tsutsuki Kiyoshi
Faculty Of Agriculture Nagoya University
関連論文
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