| Study on deficit irrigation based on CROPWAT model |
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| DOI：10.7606/j.issn.1000-7601.2010.01.06 |
| Key Words: deficit irrigation CROPWAT model simulation |
| Author Name | Affiliation | | SUN Shikun | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | CAI Huanjie | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Jian | Key Laboratory of Agricultural Soil & Water Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to verify the applicability and accuracy of FAO CROPWAT model in deficit irrigation study, both the deficit irrigation experimental scheme of cotton and spring wheat and the local meteorological data w
ere input into the model. Then, analysis was made of the simulation effect of the application of CROPWAT model study in crop evapotranspiration and the impact of deficit irrigation on crop yield. The results showed that the simulated values and measured values of cotton's daily evapotranspiration showed the same distribution regulation, but the simulated values were 0.15～1 mm higher than the measured ones as a whole; the simulation of the impact of deficit irrigation on cotton and spring wheat yield indicated that the simulated values and measured values showed the same tendency, and the statistical analysis of the results showed that the RMSE、EF and CRM of cotton and spring wheat were 20.62% and 10.35%; 0.98 and 0.856; -0.00051 and -0.0155 respectively, it meant that the simulated effect of CROPWAT model was preferably well, but the stimulated values were higher than measured values in general. Simulation results show that the model is applicable in deficit irrigation study, however, in order to obtain more accurate simulation results, it is necessary to correct the Kc and Ky parameters before using the model. |
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