توزیع شکلهای شیمیایی منگنز و ارتباط آن با قابلیت استفاده گیاهان تحت تاثیر لئوناردیت (Leonardite)

نوع مقاله : مقاله کامل علمی پژوهشی

نویسنده

گروه علوم خاک دانشکده کشاورزی دانشگا ارومیه

چکیده

چکیده

سابقه و هدف: تامین عناصر غذایی کم مصرف در بهبود فرایندهای بیولوژیکی گیاهان ضروری است. مقادیر کل عناصر در خاک شاخص مناسبی از قابلیت استفاده برای گیاهان نمی باشد و اغلب بصورت شکل‌های غیرقابل جذب حضور دارند. مواد هومیکی می تواند شکل‌های شیمیایی عناصر در خاک را تغییر دهد. لذا این تحقیق با هدف بررسی تاثیر لئوناردیت در تغییر شکل‌های شیمیایی منگنز در خاک‌های زراعی انجام شد.

مواد و روشها

تعداد 20 نمونه خاک زراعی از عمق 30-0 سانتیمتری از مزارع شهرستان ارومیه برداشت شد. برخی از ویژگی‌های فیزیکوشیمیایی به روش‌های استاندارد، منگنز قابل استفاده به روش DTPA و کانی شناسی رس (20) اندازه گیری شدند (21). طیف FT-IR لئوناردیت جهت تعیین گروههای عاملی بررسی شد. بررسی های آزمایشگاهی بصورت فاکتوریل در قالب طرح پایه کاملا تصادفی در سه تکرار انجام شد. چهار نمونه خاک متفاوت انتخاب شده و با استفاده از MnSO4.H2O با غلظت 200 میلی گرم در کیلوگرم منگنز تیمار شد و به مدت دو ماه در رطوبت ظرفیت مزرعه‌ای نگهداری شدند. بعد از انکوباسیون سطوح مختلفی از لئوناردیت (0، 2 و 4 درصد) اضافه شد. منگنز قابل استفاده و شکلهای شیمیایی آن پس از گذشت 20، 90 و 120 روز با استفاده از روش DTPA و عصاره گیری متوالی (32) اندازه گیری شد.



یافته ها

نتایج نشان داد که کمیت و کیفیت کانی‌های رس متفاوت بود و کانی غالب خاک‌های مورد مطالعه ایلیت بود. نتایج نشان داد که لئوناردیت دارای گروه‌های عاملی مختلف بوده و تاثیر معنی دار در افزایش میزان منگنز قابل استفاده گیاه داشت (P

کلیدواژه‌ها


عنوان مقاله [English]

Distribution of Manganese Chemical Forms and its Relationship to the Availability of Plants Affected by Leonarditis

نویسنده [English]

  • behnam Doulati
Department of Soil Science Faculty of Agriculture Urmia University Urmia, Iran
چکیده [English]

Introduction: Supply of micronutrients is necessary for the improvement of plant biological processes. The total amount of elements in soil is not an appropriate indicator for plant availability, because main portion of nutrients are usually as unavailable forms. Humic substances can change the chemical forms of elements in soil. Therefore, this study was done to investigate the influence of humic substance on changes of chemical forms of manganese (Mn) in some cultivated soils of Urmia region.

Materials and Methods: Twenty soil samples were collected of 0-30 cm from the fields of Urmia region. Some physicochemical properties of soils were measured by standard methods. DTPA extractable Mn and clay mineralogy of soils were also determined. FT-IR spectra were analyzed to determine the functional groups of leonardite. Laboratory evaluations were carried out as a factorial in a completely randomized design with three replications. Four different soil samples were selected and were treated by 200 mg kg-1 MnSO4.H2O and were incubated for two months at field capacity moisture. Different levels of leonardite (0, 2 and 4%) were added after incubation. Laboratory evaluations were carried out as a factorial in a completely randomized design with three replications. The concentration and chemical forms of the Mn were evaluated using DTPA and sequential extraction method respectively after 20, 60 and 120 days.

Results: The results showed that the quality and quantity of the clay minerals were different and the illite mineral was dominant in the studied soils. Results showed that the leonardite have different functional groups and showed significant effect on increasing plant available Mn (P

کلیدواژه‌ها [English]

  • Keywords: DTPA
  • Extractable Mn
  • Humic substance
  • Sequence extraction
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