Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential
Soil water retention is important for the study of water availability to germinating weed seeds. Six soil water retention models (Campbell, Brooks-Corey, four- and five-parameter van Genuchten, Tani, and Russo) with residual soil water parameter derivations were evaluated to describe water retention...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Applied and Environmental Soil Science |
| Online Access: | http://dx.doi.org/10.1155/2012/812561 |
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| author | W. John Bullied Paul R. Bullock Rene C. Van Acker |
| author_facet | W. John Bullied Paul R. Bullock Rene C. Van Acker |
| author_sort | W. John Bullied |
| collection | DOAJ |
| description | Soil water retention is important for the study of water availability to germinating weed seeds. Six soil water retention models (Campbell, Brooks-Corey, four- and five-parameter van Genuchten, Tani, and Russo) with residual soil water parameter derivations were evaluated to describe water retention for weed seed germination at minimum threshold soil water potential for three hillslope positions. The Campbell, Brooks-Corey, and four-parameter van Genuchten model with modified or estimated forms of the residual parameter had superior but similar data fit. The Campbell model underestimated water retention at a potential less than −0.5 MPa for the upper hillslope that could result in underestimating seed germination. The Tani and Russo models overestimated water retention at a potential less than −0.1 MPa for all hillslope positions. Model selection and residual parameter specification are important for weed seed germination by representing water retention at the level of minimum threshold water potential for germination. Weed seed germination models driven by the hydrothermal soil environment rely on the best-fitting soil water retention model to produce dynamic predictions of seed germination. |
| format | Article |
| id | doaj-art-1d14dd74d8b8407087030ae32d2cd4a0 |
| institution | Kabale University |
| issn | 1687-7667 1687-7675 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Applied and Environmental Soil Science |
| spelling | doaj-art-1d14dd74d8b8407087030ae32d2cd4a02025-02-03T05:59:11ZengWileyApplied and Environmental Soil Science1687-76671687-76752012-01-01201210.1155/2012/812561812561Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water PotentialW. John Bullied0Paul R. Bullock1Rene C. Van Acker2Department of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, CanadaDepartment of Soil Science, University of Manitoba, Winnipeg, MB, R3T 2N2, CanadaDepartment of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, CanadaSoil water retention is important for the study of water availability to germinating weed seeds. Six soil water retention models (Campbell, Brooks-Corey, four- and five-parameter van Genuchten, Tani, and Russo) with residual soil water parameter derivations were evaluated to describe water retention for weed seed germination at minimum threshold soil water potential for three hillslope positions. The Campbell, Brooks-Corey, and four-parameter van Genuchten model with modified or estimated forms of the residual parameter had superior but similar data fit. The Campbell model underestimated water retention at a potential less than −0.5 MPa for the upper hillslope that could result in underestimating seed germination. The Tani and Russo models overestimated water retention at a potential less than −0.1 MPa for all hillslope positions. Model selection and residual parameter specification are important for weed seed germination by representing water retention at the level of minimum threshold water potential for germination. Weed seed germination models driven by the hydrothermal soil environment rely on the best-fitting soil water retention model to produce dynamic predictions of seed germination.http://dx.doi.org/10.1155/2012/812561 |
| spellingShingle | W. John Bullied Paul R. Bullock Rene C. Van Acker Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential Applied and Environmental Soil Science |
| title | Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential |
| title_full | Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential |
| title_fullStr | Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential |
| title_full_unstemmed | Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential |
| title_short | Modelling Soil Water Retention for Weed Seed Germination Sensitivity to Water Potential |
| title_sort | modelling soil water retention for weed seed germination sensitivity to water potential |
| url | http://dx.doi.org/10.1155/2012/812561 |
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