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Assessment of AquaCrop and CropWat Models in the Simulation of Deficit Irrigation Impact on Cotton Crop

تقييم أداء النموذجين AquaCrop و CropWat في محاكاة تأثير الري الناقص في محصول القطن

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 Publication date 2011
and research's language is العربية
 Created by Shamra Editor




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This study was carried out to compare the performance of the FAO AquaCrop and CropWat models in simulating the effects of deficit irrigation on cotton crop. The models were calibrated using data from the 2007 growing season of a field study conducted to assess deficit irrigation effects on cotton, whereas the models were validated by comparing their outputs for yield and water use (ETc) with the measured values of the two variables in the 2008 and 2009. The relationship between measured and predicted values of yield and ETc revealed that the AquaCrop was better than CropWat in predicting water stress impact on yield and ETc. The linear regression equation for AquaCrop had a small intercept and its slope was very close to unity. The index of agreement (d) was close to one for both models, except its value for ETc in the 2009 year. Both models could reproduce the general trend of the changes in soil water content in the different irrigation levels. Accordingly, the use of AquaCrop instead of CropWat should be encouraged for management and planning of irrigation, since it is a practitioner type model keeps a good balance between output accuracy and simplicity.


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Research summary
تتناول هذه الدراسة تقييم أداء نموذجي AquaCrop و CropWat في محاكاة تأثير الري الناقص على محصول القطن. تم معايرة النموذجين باستخدام بيانات موسم النمو لعام 2007، وتم التحقق من صحة النتائج بمقارنة الإنتاجية والاستهلاك المائي (ETc) بالقيم المقيسة في موسمي 2008 و2009. أظهرت النتائج أن أداء AquaCrop كان أفضل بكثير من CropWat في التنبؤ بتأثير الإجهاد المائي على الإنتاجية وETc، حيث كانت معادلات الانحدار الخطي لـ AquaCrop ذات ميل قريب من الواحد وقيم القاطع صغيرة. كما كانت قيم دليل التوافق (d) بين القيم المقيسة والمتوقعة قريبة جداً من الواحد، باستثناء قيمة ETc في CropWat لموسم 2009. تمكن كلا النموذجين من محاكاة المنحى العام لتغيرات المحتوى المائي للتربة في معاملات الري المختلفة بصورة جيدة. تشجع نتائج هذه الدراسة على التحول من استخدام CropWat إلى AquaCrop في إدارة الري وتخطيطه، نظراً لدقته وبساطته.
Critical review
دراسة نقدية: على الرغم من أن الدراسة قدمت نتائج مهمة حول أداء نموذجي AquaCrop و CropWat، إلا أنها لم تتناول بعض الجوانب الهامة مثل تأثير التغيرات المناخية المستقبلية على أداء النموذجين. كما أن الدراسة اعتمدت على بيانات من منطقة واحدة فقط، مما قد يحد من تعميم النتائج على مناطق أخرى ذات ظروف مناخية وتربوية مختلفة. بالإضافة إلى ذلك، كان من الممكن أن تكون الدراسة أكثر شمولية إذا تم تضمين تحليل اقتصادي لتكاليف وفوائد استخدام كل من النموذجين في إدارة الري.
Questions related to the research
  1. ما هو الهدف الرئيسي من الدراسة؟

    الهدف الرئيسي من الدراسة هو تقييم أداء نموذجي AquaCrop و CropWat في محاكاة تأثير الري الناقص على محصول القطن.

  2. ما هي البيانات التي استخدمت لمعايرة النموذجين؟

    تم استخدام بيانات موسم النمو لعام 2007 لمعايرة النموذجين، وتم التحقق من صحة النتائج بمقارنة الإنتاجية والاستهلاك المائي بالقيم المقيسة في موسمي 2008 و2009.

  3. أي النموذجين كان أفضل في التنبؤ بتأثير الإجهاد المائي على الإنتاجية وETc؟

    كان نموذج AquaCrop أفضل بكثير من CropWat في التنبؤ بتأثير الإجهاد المائي على الإنتاجية وETc.

  4. ما هي التوصية الرئيسية التي توصلت إليها الدراسة؟

    تشجع الدراسة على التحول من استخدام CropWat إلى AquaCrop في إدارة الري وتخطيطه، نظراً لدقته وبساطته.


References used
Evett, S. R. and J. A. Tolk. (2009). Introduction: Can water use efficiency be modeled well enough to impact crop management? Agron J 101: 423-425
FAO. (1979). Yield response to water by J. Doorenbos and A. Kassam. FAO Irrigation and Drainage Paper No. 33. Rome
FAO. (1998). Crop evapotranspiration by Allen, R. G., L. S. Pereira, D. Raes, M. Smith. FAO Irrigation and Drainage Paper No. 56. Rome
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