بهمنظور بررسی تأثیر تراکم بوته باقلا در تناوب و استفاده از کود نیتروژن معدنی بر عملکرد خشک علوفه ذرت علوفهای، آزمایشی بهصورت فاکتوریل در قالب طرح بلوکهای کامل تصادفی با سه تکرار در دو سال زراعی 97-1396 و 98-1397 در مزرعه تحقیقاتی دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی به اجرا درآمد. عاملهای مورد مطالعه شامل تراکم بوته باقلا در تناوب (25، 35، 40 و 80 بوته در مترمربع) و سطوح نیتروژن (0، 100، 200 و 300 کیلوگرم در هکتار بر پایه کود اوره) در ذرت علوفهای بودند. همچنین یک سطح نکاشت از باقلا به منظور مقایسهی اثر تراکمهای مختلف این گیاه بر ویژگیهای ذرت علوفهای در نظر گرفته شد. نتایج تجزیه مرکب نشان داد که اثر تراکم بوته باقلا بر عملکرد دانه، وزن100دانه، عملکرد بیولوژیک، شاخص برداشت و نیز درصد کاهش وزن خشک علفهرز در باقلا معنیدار بود، بهطوریکه بیشترین عملکرد دانه از تراکم 80 بوته باقلا بهدست آمد و در تراکم 40 بوته باقلا بیشترین وزن100دانه و شاخص برداشت مشاهده شد. همچنین در این آزمایش، عملکرد خشک علوفه ذرت، عملکرد پروتئین، کارآیی زراعی و کارآیی بازیافت نیتروژن تحت تأثیر اثر متقابل تراکم بوته باقلا و کاربرد کود نیتروژن قرار گرفت. بیشترین عملکرد خشک علوفه ذرت علوفهای از تیمار تراکم 40 بوته باقلا+200 کیلوگرم نیتروژن در هکتار بهدست آمد که نسبت به تیمار شاهد افزایش 155 درصدی نشان داد. بهطور کلی نتایج نشان داد که قرارگیری باقلا در تناوب با ذرت علوفهای میتواند از طریق کاهش مصرف کود نیتروژن، باعث افزایش عملکرد خشک علوفه، بهبود کارآیی زراعی و بازیافت نیتروژن نسبت به سیستم تککشتی در ذرت علوفهای گردد.
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