جذب و توزیع فسفر در دو گیاه گندم و جو در مراحل طویل شدن ساقه و گرده‌افشانی تحت تأثیر مقدار کود فسفره و مایه زنی با باکتری استرپتومایسس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زراعت، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

2 گروه زراعت دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

3 استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان

4 گروه خاکشناسی دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

5 دانشجوی دکتری دانشگاه علوک کشاورزی و منابع طبیعی گرگان

چکیده

در این مطالعه بررسی غلظت، جذب و توزیع فسفر، به‌عنوان محدودکننده‌ترین عنصر معدنی ضروری بعد از نیتروژن، در این دو مرحله در گندم و جو مورد توجه قرار گرفت. بدین منظور، در سال زراعی 94-1393 آزمایشی با سه فاکتور شامل مقدار فسفر کودی (0، 20، 40، 60 و 80 کیلوگرم در هکتار)، مایه‌زنی با باکتری استرپتومایسس و نوع گیاه زراعی در قالب طرح کاملاً تصادفی به‌صورت فاکتوریل در دانشگاه علوم کشاورزی گرگان انجام شد. در هر دو مرحله یاد شده، با افزایش مقدار فسفر کودی، غلظت و تجمع فسفر در بخش‌های مختلف گیاه به‌صورت خطی افزایش یافت. در تمام مقادیر فسفر کودی، ترتیب بخش‌های بوته از نظر غلظت فسفر به‌صورت برگ> بخش هوایی> کل بوته> ساقه> ریشه و از نظر تجمع فسفر به صورت کل بوته > بخش هوایی> ساقه> برگ> ریشه بود. مایه‌زنی با باکتری باعث افزایش معنی‌دار غلظت فسفر ریشه در SE، و غلظت فسفر برگ، بخش هوایی و کل بوته، و تجمع فسفر در این اندام‌ها به‌علاوه‌ ساقه در Ant شد. در هر دو مرحله، غلظت و مقدار فسفر تجمع یافته در بخش‌های مختلف بوته به استثنای مقدار فسفر تجمع یافته در ساقه، در جو به‌طور معنی‌داری بیشتر از گندم بود. نتایج حاکی از ثبات بیشتر ضریب توزیع فسفر به بخش‌های گیاه در مقایسه با غلظت و تجمع فسفر بود. یافته‌های مطالعه حاضر نشان‌دهنده‌ی همبستگی قوی بین مقدار فسفر جذب شده در SE و Ant با عملکرد دانه بود که به‌وسیله تابع دو تکه‌ای خطی-مسطح توصیف شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Phosphorus uptake and partitioning in stem elongation and anthesis growh stages of wheat and barley as influenced by fertilizer P rate and inoculation with Streptomyces sp. bacterium

نویسندگان [English]

  • Toktam Khosraviyan 1
  • Ebrahim Zeinali 2
  • reza Ghorbani nasrabad 4
  • Syed Majid Alimagham 5
1 Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran.
2 Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran.
4 Department of Soil Science, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran.
5 Department of Agronomy, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran.
چکیده [English]

In this study, concentration, absorption and distribution of phosphorus, as most restrictive essential element after nitrogen, in these two stages of wheat and barley were studied.The experimental factors were fertilizer P rate (0, 8.4, 16.8, 25.2 and 33.6 mg P per kg dry soil equal to 0, 20, 40, 60 and 80 kg P ha-1), inoculation or uninoculation with Streptomyces sp. bacterium and crop (wheat cultivar Morvarid and barley cultivar Sahra). In both growth stages of SE and Ant, P concentration was increased linearly in all plant parts by increasing the amount of applied fertilizer phosphorus. In all fertilizer P rates, plant parts in terms of P concentration were arranged as leaf > shoot > total plant > stem > root, and in term of P content were arranged as root< leaf< stem< shoot< total plant. Inoculation with Streptomyces isolate increased root P concentration in SE and leaf, shoot and whole plant P concentration in Ant, P accumulation in these parts of plants and stem in Ant, significantly. In both growth stages, P concentration and accumulation in different parts of plant except phosphorus has accumulated in the stem, in barley was more than wheat. Results showed that P allocation coefficient to different organs has higher stability than P concentration and accumulation. Findings of this study indicated a strong relationship between the amount of accumulated P in whole plant in SE and Ant with grain yield in two crops. This relationship well described by a segmented linear-plateau function.

کلیدواژه‌ها [English]

  • Streptomyces
  • phosphate solubilizing bacterium
  • fertilizer phosphorus rate
  • Grain yield
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