تأثیر باکتری های ریزوسفری محرک رشد گیاه در برهمکنش با بیوچار و کمپوست بقایای هرس بر زیست فراهمی برخی عنصرهای غذایی کم مصرف در ریزوسفر گیاه گندم (Triticum aestivum L.)

نویسندگان

1 دانشجوی دکتری علوم خاک، گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه، ایران.

2 عضو هیات علمی دانشگاه ارومیه-گروه علوم خاک

چکیده

در شرایط خشک و نیمه‌خشک ایران اکثر خاک‌ها آهکی و دارای ماده آلی کم بوده و میزان عنصرهای غذایی کم-مصرف قابل جذب کمی دارند. این پژوهش با هدف بررسی زیست‌فراهمی برخی عنصرهای کم‌مصرف تحت تأثیر بیوچار و کمپوست بقایای هرس درختان در حضور باکتری‌های PGPR در ریزوسفر گندم در شرایط رایزوباکس انجام گردید. فاکتورهای مورد بررسی شامل بقایای آلی (بیوچار، کمپوست و شاهد)، تلقیح میکروبی (تلقیح باکتری PGPRو بدون تلقیح) در خاک ریزوسفر بودند. در پایان دوره رشد، ماده آلی (OM) و غلظت آهن، روی، مس و منگنز در خاک‌های ریزوسفری و جذب این عناصر در گیاه اندازه‌گیری شد. نتایج نشان داد که میزان ماده آلی و عنصرهای غذایی کم‌مصرف در خاک ریزوسفر تحت تأثیر بقایای آلی و باکتری‌های PGPR افزایش معنا‌داری داشتند. افزودن بیوچار در شرایط تلقیح منجر به افزایش 6/84 و 9/17 درصدی غلظت آهن و منگنز نسبت به شرایط بدون تلقیح در خاک ریزوسفر شد. حضور PGPRها سبب افزایش زیست‌فراهمی 2/52 و 9/34 درصدی روی و مس در تیمار کمپوست در مقایسه با تیمار بدون تلقیح گردید. کاربرد بقایای آلی و تلقیح باکتریایی سبب افزایش جذب عنصرهای غذایی کم‌مصرف توسط گیاه گندم شد. نتایج نشان داد که بقایای آلی و تلقیح میکروبی می‌تواند سبب افزایش جذب عناصر کم مصرف گیاه گندم شوند.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Plant Growth Promoting Rhizobactria (PGPR) on Interaction with Biochar and Compost of Trees Pruning on Bioavailability of Some Micronutrients in the Wheat Rhizosphere (Triticum aestivum L.)

نویسندگان [English]

  • Roghayeh Vahedi 1
  • MirHassan Rasouli-Sadaghiani 2
1 Ph.D. Student of Soil Science, Faculty of Agriculture, Urmia University,Iran.
2 Dept of Soil Science, Urmia University
چکیده [English]

In arid and semiarid regions of Iran, most of soils are calcareous and low in organic matter, therefore are deficient in micronutrients. This research was aimed to evaluate the bioavailability of selected micronutrients as affected by biochar and compost of trees pruning in the presence of PGPR in wheat rhizosphere. In a rhizobox study, an experiment carried out in a completely randomized design under greenhouse conditions. The factors including the organic sourses (pruning waste biochar, pruning waste compost and control), microbial inoculation (with and without PGPR). At the end of the growth period, organic matter (OM) cotent and bioavailability of micronutrients including iron (Fe), zinc (Zn), copper (Cu) and manganese (Mn) in the rhizosphere soil and their uptake by wheat plant were determined. The results indicated that OM, Fe, Zn, Mn and Cu were significantly increased in rhizosphere soil under the influence of organic sources and PGPR inoculation. Addition of biochar under inoculation conditions resulted in 84.6% and 17.9% increase in rhizosphere Fe and Mn, respectively, compared to the non-inoculated treatment. The presence of PGPR increased the bioavailability of Zn and Cu by 52.2% and 34.9%, respectively, in compost treatment compared to the non-inoculated ones. Application of organic sources and bacterial inoculation increased the micronutrient uptake by plant. 

کلیدواژه‌ها [English]

  • Bacteria
  • Micronutrient elements
  • Organic materials
  • Pyrolysis
  • Rhizobox

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دانش آب و خاک
دوره 33، شماره 1
فروردین 1402
صفحه 93-106

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