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Theory and Measurement of Water Potential
Abstract
Water potential is a fundamental concept now widely accepted for quantifying the energy state of water in soil, organic materials, plants, seeds, and microorganisms. The concept provides a convenient means for applying unified thermodynamic terminology to water relations of soil-plant-microbiological systems. Water potential is the free energy of water in a system, relative to the free energy of a reference pool of pure, free water. The total water potential may be expressed as a sum of components identifiable with the forces that retain or act on the water and affect its energy state. Water potentials can be inferred from water content measurements; care must be exercised, since hydraulic conductivities are very low at low water potentials, and equilibrium in the pressure plate can take considerable time or be difficult to achieve. Control of water potential in microbiological and biochemical studies is usually based on near equilibrium conditions where the potential is either osmotic or matric.
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Fredrickson, J. K., Zachara, J. M., Balkwill, D. L., Kennedy, D., Li, S.-M. W., Kostandarithes, H. M., Daly, M. J., Romine, M. F., & Brockman, F. J. (2004) · Applied and Environmental Microbiology · doi:10.1128/aem.70.7.4230-4241.2004 · Cited by 284
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Metadata
- Authors
- Papendick, R. I., & Campbell, G. S.
- Venue
- SSSA Special Publications
- Publisher
- Wiley
- Published
- 1981-01
- Pages
- 1-22
- ISSN
- 0081-1904 (ISSN-L)
- 2165-9826
- OpenAlex
- W2258616664
- Cited by
- 258
- References
- 0
- Type
- other
- Language
- en
- Open access
- closed
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