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شبیه‌سازی رشد ذرت تحت مدیریت‌های مختلف آب و نیتروژن با مدل AquaCrop | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 6، دوره 46، شماره 2، تیر 1394، صفحه 207-220 اصل مقاله (1.57 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2015.55926 | ||
| نویسندگان | ||
| میلاد ابراهیمی1؛ وحیدرضا وردی نژاد* 2؛ ابوالفضل مجنونی هریس3 | ||
| 1دانشجوی کارشناسی ارشد آبیاری و زهکشی گروه مهندسی آب دانشکدة کشاورزی دانشگاه ارومیه | ||
| 2استادیار گروه مهندسی آب دانشکدة کشاورزی دانشگاه ارومیه | ||
| 3استادیار گروه مهندسی آب دانشکدة کشاورزی دانشگاه تبریز | ||
| چکیده | ||
| در این مطالعه کارایی مدل شبیه‌سازی رشد گیاه AquaCrop در پیشبینی عملکرد دانه، رشد مادة خشک، و پوشش گیاهی ذرت تحت مدیریت‌های مختلف عمق آبیاری و نیتروژن ارزیابی شد. آزمایش مزرعهای با سه سطح نیتروژن شامل 0 و 150 و 300 کیلوگرم نیتروژن بر هکتار (به ترتیب N1 و N2 و N3) و چهار عمق آبیاری شامل 60، 80، 100، و 120 درصد تخلیة رطوبت خاک (به ترتیب I1، I2، I3، و I4) با سه تکرار طی دو سال و به صورت طرح بلوک کامل تصادفی اجرا شد. مدل AquaCrop بر اساس اطلاعات زراعی سال اول آزمایش واسنجی و سال دوم اعتبارسنجی شد. به طور کلی، مدل AquaCrop دقت بالایی در شبیه‌سازی رشد ذرت داشت. اما در سطح آبیاری I1 در تخمین مادة خشک و سطح کودی N1 در تخمین پوشش گیاه دقت کمتری نشان داد. متوسط ریشة میانگین مربعات خطای نرمال (NRMSE) تخمین عملکرد دانه در مرحلة واسنجی و اعتبارسنجی به ترتیب 89/7 و 86/4 درصد به دست آمد. در پیشبینی رشد مادة خشک، در سطح نیتروژن معین، افزایش تنش آبی باعث افزایش خطای پیشبینی مادة خشک توسط مدل شد. در همة تیمارها مادة خشک به صورت بیش‌برآورد پیشبینی شد و متوسط NRMSE پیشبینی رشد مادة خشک در مرحلة واسنجی و اعتبارسنجی به ترتیب 7/18 و 9/20 درصد محاسبه شد. همچنین، مدل AquaCrop رشد پوشش گیاهی در سطح نیتروژن N2 را با دقت بالا پیشبینی کرد؛ اما در سطوح نیتروژن N1و N3 به ترتیب خطای کم‌برآورد و بیش‌برآورد نشان داد. متوسط خطای ریشة میانگین مربعات (RMSE) تخمین پوشش گیاهی (کل تیمارها) در واسنجی و اعتبارسنجی به ترتیب 7/11 و 3/7 درصد محاسبه شد. | ||
| کلیدواژه‌ها | ||
| رشد پوشش گیاهی؛ رشد مادة خشک؛ شیراز؛ عملکرد دانه؛ مدل رشد گیاه | ||
| عنوان مقاله [English] | ||
| Dynamic Simulation through Aqua Crop of Maize Growth under Different Management Decisions of Water Application and Nitrogen Fertilizer Use | ||
| نویسندگان [English] | ||
| Milad Ebrahimi1؛ Vahid Reza Verdinejad2؛ Abolfazl Mjnooni - Heris3 | ||
| 1Graduate Student, Irrigation and Drainage, Department of Water Engineering, Urmia University, Urmia, Iran | ||
| 2Assistant Professor, Department of Water Engineering, Urmia University, Urmia, Iran | ||
| 3Assistant Professor, Department of Water Engineering, University of Tabriz, Tabriz, Iran | ||
| چکیده [English] | ||
| The performance of crop growth simulation model, Aqua Crop was evaluated to predict grain yield, biomass and canopy cover in maize growth under different management conditions of depth of irrigation (I) and nitrogen (N) application. A field experiment was conducted with three levels of N comprise of : 0, 150 and 300 kg N ha-1 (N1, N2 and N3) along with four depths of irrigation, corresponding with 60, 80, 100 and 120 percent of soil water depletion ( I1, I2, I3 and I4), in the framework of a randomized complete block design of three replications during 2002-2004. AquaCrop model was calibrated and then validated as based upon field data collected respectively from the first and second year of the experiment. Based upon the results obtained the AquaCrop model simulated the maize’s grain yield with a high precision under different levels of nitrogen fertilizer and irrigation depths. In total, the AquaCrop model exhibited a high precision in simulation with respect to maize growth. However, the model indicated low precision in the I1 irrigation level treatment for biomass prediction and N1 nitrogen level as regards canopy cover prediction. The average normalized Root Mean Square Error of grain yield prediction for the calibration and validation cases were calculated as 7.89 and 4.86 percent, respectively. For biomass growth in a special nitrogen fertilizer level, increasing water stress causes an increase in the biomass prediction error as reflected by the model. Biomass (in all treatments) was predicted as over-estimated with the average normalized Root Mean Square Error for calibration and validation being obtained as 18.7 and 20.9 percent, respectively. AquaCrop model predicted canopy cover growth of maize under N2 nitrogen level with a high precision; but within the N1 and N3 nitrogen levels they were under and over-estimated, respectively. The average Root Mean Square Error (RMSE) of percent canopy cover for all the treatments in calibration and validation were obtained as 11.7 and 7.33 percent, respectively. | ||
| کلیدواژه‌ها [English] | ||
| Canopy Cover Growth, Biomass Growth, Shiraz, Grain yield, Crop Growth Model | ||
| مراجع | ||
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