نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زراعت و اصلاح نباتات، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران

2 دانشگاه محقق اردبیلی

3 دانشگاه محقق اردبیلی.

4 دانش آموخته کارشناسی ارشد رشته علوم وتکنولوژی بذر/گروه زراعت و اصلاح نباتات، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران.

چکیده

به منظور کمی سازی دمای کاردینال و مدل هیدروتایم بذور زیره سبز، آزمایشی به صورت کاملاً تصادفی با 3 تکرار در آزمایشگاه دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی در سال 1396 اجرا شد. تیمارهای آزمایشی شامل دما-های 0، 5، 10، 15، 20، 25، 30، 35 و 40 درجه سانتیگراد و پتانسیل پایه 0، 2/0-، 4/0-، 6/0-، 8/0-، 1- و 2/1 - مگاپاسکال بود. برآورد دماهای کاردینال مورد نیاز برای کسرهای 10، 50 و 90 درصد جوانه زنی با استفاده از چهار مدل بتا، بتای اصلاح شده، دندانه ای و دو تکه ای مورد ارزیابی قرار گرفت. از شاخصهای مختلف آماری مانند ریشه میانگین مربعات خطا (RMSE)، ضریب تبیین (R2) و شاخص آکائیک (AICc) برای مقایسه بین مدلها استفاده شد. نتایج نشان داد مدل بتا نسبت به سایر مدلها واکنش سرعت جوانه زنی زیره سبز به دما را بهتر توصیف کرد، همچنین دمای کمینه جوانه زنی زیره سبز بین 7/0 تا 90/0 سانتی گراد، دمای بهینه بین محدوده 20 تا 21 درجه سانتیگراد و دمای بیشینه 35 درجه برآورد شد. همچنین بر اساس نتایج مدل هیدروتایم ضریب هیدروتایم بذور زیره 5/97 و استانه تحمل به تنش 46/0- مگاپاسکال تخمین زده شد.

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