In:
Soil Science Society of America Journal, Wiley, Vol. 62, No. 5 ( 1998-09), p. 1440-1442
Abstract:
Soil compressibility is an important soil physical property in the prediction of compaction behavior. The compression index, C , as a measure of compressibility, was determined for a wide range of South African forest soils and compared with existing models that utilize clay content as the independent variable. These models were tested using a model performance technique that distinguished between systematic (bias) and nonsystematic (random) errors. The maximum compression index, C max , was adequately predicted for all soil orders in this study and possessed a relatively low systematic error. The average compression index, C mod , which was calculated in this study as the average of C values across a wide range of water contents, was generally underpredicted and showed a slightly higher systematic error than with C max . It is concluded that the slightly better performance of the models in predicting C max was due to the models being developed on moist to wet soils (Ψ p 〉 −100 kPa) when compression is at a maximum. Since compaction can also occur under moist to dry conditions, our results indicate that modelling compaction behavior for soils that occur in regions with a pronounced dry season will require compression indices developed across a wider range of water contents than is currently the case.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj1998.03615995006200050041x
Language:
English
Publisher:
Wiley
Publication Date:
1998
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
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