تاثیر دو ماده هیومیک بر رشد و جذب سرب گیاه ذرت در یک خاک آهکی

نوع مقاله : مقاله کامل

نویسندگان

دانشگاه شیراز

چکیده

چکیده-   در چند دهه گذشته، در نتیجه فعالیت های انسانی، غلظت فلزات سنگین از جمله سرب در محیط زیست به طور آشکاری افزایش یافته است. خطر اصلی زیست محیطی ناشی از فلزات سنگین خاک مربوط به غلظت شکل های متحرک وقابل جذب توسط گیاه می باشد، کاربرد مواد مختلف از جمله مواد هیومیک ممکن است به دلیل تاثیر بر حلالیت و تحرک آن ها در خاک میزان جذب سرب توسط گیاه را تحت تاثیر قرار دهد. در این تحقیق به منظور بررسی اثر مواد هیومیک چهار سطح از هر کدام از مواد هیومیک تجاری مایع  و جامد در دو آزمایش فاکتوریل در قالب طرح کاملا تصادفی در یک خاک آهکی آلوده شده با سه سطح سرب به کار برده شد. نتایج این تحقیق گلخانه ای نشان داد که تاثیر دو ماده هیومیک با ترکیبات شیمیایی متفاوت بر وزن خشک  گیاه متفاوت بوده است. تاثیر مواد هیومیک بر وزن خشک گیاه به مقدار زیادی به ترکیب شیمیایی آن ها بستگی دارد. در هر دو آزمایش بیشترین میزان وزن خشک در سطوح توصیه شده به وسیله سازنده این مواد مشاهده شد، اما تیمارهای ماده هیومیک تجاری جامد اثر معنی داری بر میزان وزن خشک گیاه نداشت. کاربرد هر دو ماده هیومیک جذب سرب در گیاه را به طور معنی داری افزایش داد. در هر دو آزمایش، اضافه کردن مواد هیومیک فاکتور غنی سازی را به طور معنی داری افزایش داد، اما اثر کمی بر جذب عناصر میکرو داشت.

کلیدواژه‌ها

موضوعات


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