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| International Agrophysics |
| publisher: | Institute of Agrophysics
Polish Academy of Sciences
Lublin, Poland |
| ISSN: |
0236-8722 |
vol. 20, nr. 4 (2006)
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Hysteresis between wetting and drying processes as affected by soil aggregate size
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B. Witkowska-Walczak
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Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, P.O. Box 201, 20-290 Lublin 27, Poland
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vol. 20 (2006), nr. 4,
pp. 359-365
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abstract
The impact of different sizes of soil aggregates on
the hysteresis of their water retention characteristics was determined.
Soil aggregates were separated from the arable layer of Orthic
Podzol, Eutric Cambisol and Haplic Phaeozem. The results of the
study showed that the impact of aggregate size was significant. It
was found that differences in water content during the drying and
wetting processes varied not only for the chosen soil water potential
and aggregate size, but also for the type of soil. The maximum
differences in water content between the drying and wetting
processes at the same soil water potential reached nearly 15% vol.
in absolute values. Thus it can be stated that negligence of the hysteresis
effect can cause inaccuracy of estimation of soil moisture.
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keywords
soil aggregation, water retention curve,
hysteresis
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