نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی آبیاری زهکشی، دانشگاه تهران.

2 استاد گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران

3 دانشیار گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران.

چکیده

کود نیتروژن بر روی پارامترهای رشد و در نهایت عملکرد محصول اثر می­گذارد. شناخت این اثر برای مدیریت مصرف کود  مهم می­باشد. فرضیه این پژوهش آن است که کود نیتروژن روی چهار پارامتر رشد محصول ذرت از قبیل بهره­وری آب نرمال شده (WP*)، حداکثر پوشش گیاه(CCx)، نرخ رشد پوشش گیاه (CGC) و نرخ کاهش پوشش گیاه (CDC)اثر می­گذارد. این چهار پارامتر، ورودی­های مدل آکواکراپ هستند.هدف نخست این پژوهش تعیین معادله­ها بین کود نیتروژن و چهار پارامتر فوق و هدف دوم بررسی دقت مدل آکواکراپ برای شبیه­سازی پاسخ محصول ذرت به کود نیتروژن با استفاده از پارامترهای به­دست آمده از هدف نخست است. بدین منظور گیاه ذرت رقم اصلاح­شده سینگل کراس 704 طی دو سال زراعی 1394 و 1395 بدون تنش رطوبتی کشت شد. تیمارها با ششسطح کودی از صفر  تا 300 کیلوگرم در هکتار اجرا شدند. داده­های سال اول برای تدوین معادله­ها و داده­های سال دوم برای صحت­سنجی استفاده شدند. نتایج نشان داد تغییرات چهار پارامتر فوق با مقدار کود مصرفی از معادله درجه دو با ضریب تعیین بالایی پیروی می­کند. نتایج برآورد پارامترهای فوق برای تیمارهای کودی سال دوم در مدل آکواکرپ برای شبیه­سازی زیست توده استفاده شد. نتایج نشان داد، معادله­های بنیان شده می­تواند برای برآورد اثر تنش کود ازت بر پارامترهای رشد ذرت در مدل آکواکراپ مورد استفاده قرار گیرد. ضریب تعیین و جذر میانگین مربعات خطا به­ترتیب بالای 97/0 و کمتر از 12درصد بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation the Effect of Nitrogen Fertilizer on Maize Yield Parameters (single cross hybrid 704) for AquaCrop Model

نویسندگان [English]

  • Omid Mirzaee 1
  • Ali Rahimikhoob 2
  • Maryam Varavipour 3

1 Master Science Student of Irrigation and drainage Eng. Department of Irrigation and drainage Engineering, Aburaihan College, University of Tehran.

2 Professor, Department of Irrigation and drainage Engineering, Aburaihan College, University of Tehran

3 Associate Professor, Department of Irrigation and drainage Engineering, Aburaihan College, University of Tehran, Iran

چکیده [English]

Water and nitrogen are two main factors of plant production. Water scarcity is one of the most important challenges in the production of agricultural products in arid and semi-arid regions, as in most parts of Iran. A great deal of research has been done on the interaction between water and nitrogen and has shown that irrigation and nitrogen treatments interact with the yield. So far, various models have been developed to simulate plant performance in response to different levels of water and nitrogen. The FAO organization has provided the AquaCrop model. This model simulates yield performance in response to water consumption. The effect of nitrogen deficiency on yield in the latest versions of the AquaCrop model (versions 4 and 5) is carried out using semi-quantitative method. In this method, nitrogen deficiency is assumed to be based on four parameters: 1- Normalized water productivity (WP*), 2- maximum canopy cover (CCx), 3- The Canopy growth coefficient (CGC) and 4- Canopy decline coefficient (CDC). The hypothesis of this research is that there is a relationship between the four above parameters and nitrogen fertilizer for corn, and from them, we can determine the values of four parameters for each fertilizer level and use them in the AquaCrop model. Therefore, the first goal of this study was to determine the equations between nitrogen fertilizer and the four above parameters. The second goal of this study was to evaluate the accuracy of the AquaCrop model for simulating the response of corn to nitrogen fertilizer using parameters derived from the equations defined in the first part.

کلیدواژه‌ها [English]

  • Crop Yield
  • Simulation
  • Normalized Water Productivity
  • Maximum Canopy Cover
  • Canopy Growth Coefficient

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