نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی‌ارشد، گروه خاک‌شناسی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

2 دانشجوی دکتری، گروه زراعت، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

3 استاد، گروه خاک‌شناسی، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

چکیده

به منظور بررسی تاثیر کودهای زیستی بر شاخص‌های رشدی گیاه ذرت(Zea mays L.) در خاک‌های آلوده به سرب، آزمایشی در گلخانه گروه خاک‌شناسی دانشکده کشاورزی دانشگاه زنجان در سال 1394 بصورت فاکتوریل بر پایه طرح کاملاً تصادفی در 3 تکرار به اجرا درآمد. تیمارهای مورد بررسی عبارت بودند از سطوح آلودگی خاک به سرب (0، 50، 100، 200 و 400 میلی‌گرم بر کیلوگرم خاک) و تلقیح با کودهای زیستی مختلف شامل: باکتری حل کننده‌ی فسفات، قارچ میکوریز گلوموس موسه‌آ و قارچ میکوریز گلوموس اینتراردیس بود. فاکتورهای مورد اندازه‌گیری شامل: شاخص کلروفیل برگ، ارتفاع گیاه، وزن تر و خشک ریشه و اندام هوایی، فسفر و پتاسیم ریشه و اندام هوایی بود. نتایج حاکی از آن بود که کاربرد کودهای زیستی شاخص‌‌های کلروفیل برگ، ارتفاع گیاه، ، فسفر و پتاسیم ریشه و اندام هوایی ذرت را نسبت به تیمار شاهد به طور معنی داری افزایش داد. تیمار قارچ گلوموس و باکتری حل کننده فسفر (M+P) توانست میزان کلروفیل برگ و ارتفاع گیاه را به ترتیب 93/11 و 89/21 درصد نسبت به تیمار شاهد بهبود دهد. با افزایش سطوح آلودگی خاک به سرب، میزان شاخص کلروفیل برگ به‌طور معنی‌داری کاهش یافت به طور کلی نتایج حاکی از آن بود که تلقیح خاک با کودهای زیستی می‌تواند، اثرات سوء و مضر سرب بر رشد و عملکرد گیاه را هر چند اندک اما کاهش دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the effect of biofertilizers on growth indices of maize (Zea maze) in lead (Pb) contaminated soils

نویسندگان [English]

  • fatemeh rostami 1
  • moslem heydari 2
  • Ahmad golchin 3

1 Former M.Sc. Student, Department of Soil Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran

2 Ph.D. Candidate, Department of Agronomy, Faculty of Agriculture, Zanjan University, Zanjan, Iran

3 Professor, Department of Soil Science, Faculty of Agriculture, Zanjan University, Zanjan, Iran

چکیده [English]

In order to investigate the effect of biofertilizers on growth characteristics of maize (Zea mays L.) in lead contaminated soils, a experiment was conducted in a greenhouse of Faculty of Agriculture, Zanjan University in 2015, Factorial experiment based on a completely randomized design (CRD) in 3 Replication. The treatments included soil contamination levels of lead (0, 50, 100, 200 and 400 mg / kg soil), and inoculation with different bio-fertilizers was including phosphate solubilizing bacteria, Glomus museae mycorrhiza and the Glomus Intardis mycorrhiza. The measured factors included: leaf chlorophyll index, plant height, fresh and dry weight of root and shoot, and phosphorus and potassium of root and shoot. The results indicated that application of bio-fertilizers significantly increased leaf chlorophyll index, plant height, potassium, phosphorus, and weight of root and shoot significantly compared to control treatment. Glomus fungus and + solubilizing bacteria (M + P) improved the leaf chlorophyll content and plant height by 11.93% and 21.89%, respectively. With increasing levels of soil contamination to lead, leaf chlorophyll index significantly decreased. In general, the results showed that soil inoculation with biological fertilizers can be reduce the harmful effects of lead in plant growth.

کلیدواژه‌ها [English]

  • Contaminated soils
  • Lead (Pb)
  • Mycorrhizal fungi
  • Phosphate solubilizing bacteria
  • Zea mays
 
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