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حمید رضا توکلی کاخکی مهدی نصیری محلاتی علیرضا کوچکی علیرضا بهشتی

چکیده

نظام‌هاي رایج کشاورزی برای حفظ و تقویت حاصلخیزی خاک به کودهای شیمیایی به­ویژه کودهای نیتروژنی وابسته می‌باشند.گرچه مصرف کودهای نیتروژنی نقش قابل توجهی در افزایش عملکرد داشته است، اما مصرف بی­رویه آن با کاهش کارایی مصرف نیتروژن همراه بوده است. اين پژوهش به­منظور بررسي و تجزيه و تحليل، روند تغييرات كارايي مصرف نيتروژن و تعيين سهم نسبي اجزای كارايي در نظام‌هاي زراعی گندم (Triticum aestivum L.) با استفاده از مدل CENTURY انجام شده است. نتايج به­دست آمده در اين مطالعه نشان داد كه ميانگين كارايي مصرف نيتروژن در نظام‌هاي زراعی گندم این مطالعه 3/28 كيلوگرم دانه به­ازای هر كيلوگرم نيتروژن فراهم یا قابل جذب خاك بود. نظام‌هاي زراعی گندم (تبريز، شيراز، گرگان) بالاترین و در مقابل نظام‌های زراعی (كرمان، بيرجند، زابل) کمترین کارایی  مصرف نیتروژن را دارا بودند. بررسي روند تغييرات عملكرد در مقابل كارايي مصرف نيتروژن نشان داد با افزايش یک واحدكارايي مصرف نيتروژن، عملكرد با شيبي معادل14/0 تن افزايش يافته است. از طرفی همبستگی مثبت و معنی­داری بین کارایی مصرف نیتروژن با کارایی تبدیل (r=0.73 p≤0.01) و جذب نیتروژن (r=0.69 p≤0.01) به­دست آمد. همچنين، تفكيك سهم نسبي اجزای كارايي مصرف نيتروژن حاكي از آن بود كه در دامنه مصرف 120-80 كيلوگرم نيتروژن در هكتار سهم نسبي اجزای كارايي جذب و تبديل به­ترتيب 64 و 36 درصد بود كه با افزايش مصرف نيتروژن به­ميزان 160-121 كيلوگرم در هكتار سهم نسبي كارايي جذب به 33 درصد وكارايي تبديل به 67 درصد تغيير يافت. به­نظر مي‌رسد در نظام‌هاي توليد گندم هنگامي كه جزء غالب كارايي جذب مي­باشد مديريت زراعي و استفاده از روش‌هاي اصلاحي زماني كه جزء غالب كارايي تبديل مي‌باشد به عنوان رهيافت‌هاي پيشنهادي در جهت بهبود كارايي مصرف نيتروژن مورد توجه مي­باشند.

جزئیات مقاله

کلمات کلیدی

آناليز اجزاء كارايي, كارايي تبديل نیتروژن, كارايي جذب نیتروژن, همبستگی

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ارجاع به مقاله
توکلی کاخکیح. ر., نصیری محلاتیم., کوچکیع., & بهشتیع. (2018). ارزيابي كارايي مصرف نيترو‍ژن در نظام‌هاي زراعی توليد گندم (Triticum aestivum L.). بوم شناسی کشاورزی, 10(3), 699-718. https://doi.org/10.22067/jag.v10i3.54239
نوع مقاله
علمی - پژوهشی

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