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| Author(s): | Belmans, C.;
Feyen, J.;
Hillel, D. |
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| Author Affiliation: | Lab. of Soil Physics, Catholic Univ. of Louvain, 3030 Heverlee, Belgium |
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| Title: | An attempt at experimental validation of macroscopic-scale models of soil moisture extraction by roots |
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| Source: | Soil Science. Vol. 127, No. 3, 1979, p. 174-186. |
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| Keywords: | TIC Keywords: Roots; Water; Water uptake; Lolium multiflorum
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| Geographic Terms: | Massachusetts; Belgium |
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| Abstract/Contents: | An experiment was conducted to test the validity of a mechanistic simulation model describing the process of soil moisture extraction by root systems, and to assess the quantitative importance of root hydraulic resistance in this process. Close-growing stands of Italian ryegrass were raised in tubes packed with sand and loam, with and without the presence of a water table. The pattern of water uptake was monitored by gamma -ray scanning and tensiometry. Correspondence between measured and independently predicted uptake patterns could be greatly improved by assigning a relatively high value of root resistivity. It is suggested that further improvements of the mechanistic model's predictive capability may require explicit formulation of conductive (axial) resistance in addition to absorptive (radial) resistance, as well as such important subsidiary factors as aeration, mechanical impedance and distribution of nutrients in the soil profile. |
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| Language: | English |
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| References: | 33 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Belmans, C., J. Feyen, and D. Hillel. 1979. An attempt at experimental validation of macroscopic-scale models of soil moisture extraction by roots. Soil Science. 127(3):p. 174-186. |
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