WATPRO: a remote sensing based model for mapping water productivity of wheat
Water productivity in agriculture needs to be improved significantly in the coming decades to secure food supply to a growing world population. To assess on a global scale where water productivity can be improved and what the causes are for not reaching its potential, the current levels must be unde...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Elsevier
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/40559 |
| _version_ | 1855526353165615104 |
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| author | Zwart, Sander J. Bastiaanssen, Wim G.M. Fraiture, Charlotte de David, S. |
| author_browse | Bastiaanssen, Wim G.M. David, S. Fraiture, Charlotte de Zwart, Sander J. |
| author_facet | Zwart, Sander J. Bastiaanssen, Wim G.M. Fraiture, Charlotte de David, S. |
| author_sort | Zwart, Sander J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Water productivity in agriculture needs to be improved significantly in the coming decades to secure food supply to a growing world population. To assess on a global scale where water productivity can be improved and what the causes are for not reaching its potential, the current levels must be understood. This paper describes the development and validation of a WATer PROductivity (WATPRO) model for wheat that is based on remote sensing-derived input data sets, and that can be applied at local to global scales. The model is a combination of Monteith's theoretical framework for dry matter production in plants and an energy balance model to assess actual evapotranspiration. It is shown that by combining both approaches, the evaporative fraction and the atmospheric transmissivity, two parameters which are usually difficult to estimate spatially, can be omitted. Water productivity can then be assessed from four spatial variables: broadband surface albedo, the vegetation index NDVI, the extraterrestrial radiation and air temperature. A sensitivity analysis revealed that WATPRO is most sensitive to changes in NDVI and least sensitive to changes in air temperature. The WATPRO model was applied at 39 locations where water productivity was measured under experimental conditions. The correlation between measured and modelled water productivity was low, and this can be mainly attributed to differences in scales and in the experimental and modelling periods. A comparison with measurements from farmer's fields in areas surrounded by other wheat fields located in Sirsa District, NW India, showed an improved correlation. Although not a validation, a comparison with SEBAL-derived water productivity in the same region in India proved that WATPRO can spatially predict water productivity with the same spatial variation. |
| format | Journal Article |
| id | CGSpace40559 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2010 |
| publishDateRange | 2010 |
| publishDateSort | 2010 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace405592025-06-17T08:23:44Z WATPRO: a remote sensing based model for mapping water productivity of wheat Zwart, Sander J. Bastiaanssen, Wim G.M. Fraiture, Charlotte de David, S. remote sensing water productivity models wheat Water productivity in agriculture needs to be improved significantly in the coming decades to secure food supply to a growing world population. To assess on a global scale where water productivity can be improved and what the causes are for not reaching its potential, the current levels must be understood. This paper describes the development and validation of a WATer PROductivity (WATPRO) model for wheat that is based on remote sensing-derived input data sets, and that can be applied at local to global scales. The model is a combination of Monteith's theoretical framework for dry matter production in plants and an energy balance model to assess actual evapotranspiration. It is shown that by combining both approaches, the evaporative fraction and the atmospheric transmissivity, two parameters which are usually difficult to estimate spatially, can be omitted. Water productivity can then be assessed from four spatial variables: broadband surface albedo, the vegetation index NDVI, the extraterrestrial radiation and air temperature. A sensitivity analysis revealed that WATPRO is most sensitive to changes in NDVI and least sensitive to changes in air temperature. The WATPRO model was applied at 39 locations where water productivity was measured under experimental conditions. The correlation between measured and modelled water productivity was low, and this can be mainly attributed to differences in scales and in the experimental and modelling periods. A comparison with measurements from farmer's fields in areas surrounded by other wheat fields located in Sirsa District, NW India, showed an improved correlation. Although not a validation, a comparison with SEBAL-derived water productivity in the same region in India proved that WATPRO can spatially predict water productivity with the same spatial variation. 2010-10 2014-06-13T14:47:54Z 2014-06-13T14:47:54Z Journal Article https://hdl.handle.net/10568/40559 en Limited Access Elsevier Zwart, S. J.; Bastiaanssen, W. G. M.; de Fraiture, Charlotte; Molden, David. 2010. WATPRO: a remote sensing based model for mapping water productivity of wheat. Agricultural Water Management, 97(10):1628-1636. doi: https://doi.org/10.1016/j.agwat.2010.05.017 |
| spellingShingle | remote sensing water productivity models wheat Zwart, Sander J. Bastiaanssen, Wim G.M. Fraiture, Charlotte de David, S. WATPRO: a remote sensing based model for mapping water productivity of wheat |
| title | WATPRO: a remote sensing based model for mapping water productivity of wheat |
| title_full | WATPRO: a remote sensing based model for mapping water productivity of wheat |
| title_fullStr | WATPRO: a remote sensing based model for mapping water productivity of wheat |
| title_full_unstemmed | WATPRO: a remote sensing based model for mapping water productivity of wheat |
| title_short | WATPRO: a remote sensing based model for mapping water productivity of wheat |
| title_sort | watpro a remote sensing based model for mapping water productivity of wheat |
| topic | remote sensing water productivity models wheat |
| url | https://hdl.handle.net/10568/40559 |
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