Summary
The water uptake rates of roots in saline soils are depressed by the simultaneously decreasing matric\(\left( {\psi _M } \right)\) and osmotic\(\left( {\psi _0 } \right)\) water potentials in the soil surrounding the roots (rhizospheric soil). Unfortunately there are no reliable tools available for direct measurements of the effect of decreasing water potentials in the rhizospheric soil on the uptake rate of soil water by roots. This paper presents some results of a vegetation technique for studying the effect of different combinations of osmotic and matric water potentials in the rhizospheric soil on the water uptake rates of barley roots.
Water uptake rates were reduced to a greater extent by decreasing soil matric water potentials than by decreasing soil osmotic water potentials. According to the results of this experiment, there was no relationship between the total soil water potential\(\left( {\psi _T } \right)\) of a sandy soil and the water uptake rates when the roots were exposed to different combinations of\(\psi _M\) and\(\psi _0\).
References
Ayers R S and Westcot D W 1976 Water Quality for Agriculture. FAO, Rome, p. 20.
Bresler E, McNeal B L and Carter D L 1982 Saline and sodic soils. Advanced series in agricultural sciences 10, Springer, Berlin-Heidelberg-New York, 139–43.
Dirksen C 1985 Irrig. Sci. 6, 39–50.
Hanks R J et al. 1978. Irrig. Sci. 1, 47.
Plessis du H M 1985 Irrig. Sci. 6, 51–61.
Russell R S 1977 Plant root systems—their Function and Interaction with the Soil. McGraw-Hill Book Company (UK) Limited, London, pp 9–29.
Schleiff U 1983 Irrig. Sci. 4, 177–189.
Wadleigh C H and Ayers R S 1945 Plant Physiol. 20, 106–132.
Wadleigh C H 1946 Soil Sci. 61, 225–38.
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Schleiff, U. Water uptake by barley roots as affected by the osmotic and matric potential in the rhizosphere. Plant Soil 94, 143–146 (1986). https://doi.org/10.1007/BF02380596
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DOI: https://doi.org/10.1007/BF02380596