Using AquaCrop to derive deficit irrigation schedules |
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Authors: | S Geerts D Raes |
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Institution: | a K.U.Leuven University, Division of Soil and Water Management, Leuven, Belgium b Universidad Mayor de San Andres, UMSA, Facultad de Agronomía, La Paz, Bolivia |
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Abstract: | Straightforward guidelines for deficit irrigation (DI) can help in increasing crop water productivity in agriculture. To elaborate such guidelines, crop models assist in assessing the conjunctive effect of different environmental stresses on crop yield. We use the AquaCrop model to simulate crop development for long series of historical climate data. Subsequently we carry out a frequency analysis on the simulated intermediate biomass levels at the start of the critical growth stage, during which irrigation will be applied. From the start of the critical growth stage onwards, we simulate dry weather conditions and derive optimal frequencies (time interval of a fixed net application depth) of irrigation to avoid drought stress during the sensitive growth stages and to guarantee maximum water productivity. By summarizing these results in easy readable charts, they become appropriate for policy, extension and farmer level use. We illustrate the procedure to derive DI schedules with an example of quinoa in Bolivia. If applied to other crops and regions, the presented methodology can be an illustrative decision support tool for sustainable agriculture based on DI. |
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Keywords: | Crop water productivity Modeling Soil water balance Drought stress Water use efficiency Supplemental irrigation |
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