The effect of PGPR and alfalfa extract on macronutrient and micronutrient contents of sorghum (Sorghum vulgare)

Document Type: Full Article


Department of Soil Sciences, Faculty of Soil and Water Engineering, University of Zabol, Zabol,, I. R. Iran


ABSTRACT- The increasing population and the pastures inability to meet food needs in livestock have led to the increase of cultivates forage plants. In order to evaluate the effect of plant growth promoting rhizobacteria (PGPR) and alfalfa (Medicago sativa) extract on the growth and concentration of macronutrient and micronutrient contents of  forage sorghum (Sorghum vulgare), an experiment was conducted as factorial aaraned in a completely randomized design with six replications  at Research Greenhouse University of Zabol. The first factor was PGPR (included soil inoculated and non-inoculated (control) medium, and the second factor was alfalfa extract in three concentrations (0, 2 and 4 ppm). The results showed that increasing alfalfa extract concentration significantly increased total plant dry weight as well as the macro and micronutrient contents. The highest and lowest manganese contents were achieved in the 0.004 levels and control of alfalfa extracts, respectively. Copper content in 0.002 level of alfalfa extract showed a 15% increase compared to the control, with no significant difference with 0.004 of alfalfa extracts. PGPR application as growing substrate also significantly increased dry weight as well as manganese, copper and potassium contents of the plant. Also, there was no significant difference in iron content at level 4 per thousand of alfalfa extract in a substrate inoculated with PGPR compared to the non-inoculated substrate. Finally, it is recommended that the effect of alfalfa extract on yield and nutrient concentrations of other plants be examined in the future.


Article Title [Persian]

تأثیر میکروارگانیسم‌های محرک رشد و عصاره یونجه بر مقادیر عناصر پر و کم‌مصرف در سورگوم علوفه‌ای

Authors [Persian]

  • اسماء میری
  • احمد غلامعلی زاده آهنگر
  • مریم قربانی
  • ابراهیم شیر محمدی
بخش علوم خاک، دانشکده مهندسی آب و خاک ، دانشگاه زابل، زابل، ج. ا. ایران.
Abstract [Persian]



چکیده- افزایش روزافزون جمعیت و عدم توانایی مراتع دربرآورد نیاز غذایی دام‌ها موجب شده است که به کشت گیاهان علوفه‌ای بیش از پیش توجه گردد. به منظور بررسی تأثیر میکروارگانیسم­های محرک رشد (PGPR) و عصاره یونجه بر رشد و مقادیر عناصر پر و کم­مصرف در سورگوم علوفه­ای،  آزمایشی گلخانه­ای به صورت فاکتوریل در قالب طرح کاملاً تصادفی و شش تکرار در دانشگاه زابل انجام شد. نخستین فاکتور شامل 2 سطح بستر خاک عدم تلقیح با PGPR و تلقیح شده با PGPR و دومین فاکتور شامل سه سطح صفر، 2 و 4 در هزار عصاره یونجه بودند. نتایج نشان داد که با افزایش غلظت عصاره یونجه، وزن خشک کل گیاه و به علاوه مقادیر عناصر کم و پرمصرف در سورگوم افزایش یافت. بیشترین و کمترین غلظت منگنز به ترتیب در سطح 004/0 و شاهد عصاره یونجه بدست آمد. غلظت مس در سطح 002/0 عصاره یونجه 15 درصد افزایش نسبت به سطح شاهد نشان داد ولی نسبت به سطح 004/0 عصاره یونجه تفاوت معناداری نداشت. همچنین، اضافه کردن PGPR به بستر رشد منجر به افزایش قابل توجهی در وزن خشک گیاه و به علاوه غلظت آهن، منگنز، مس و پتاسیم شد. در نهایت، تفاوت معنی داری در مقادیر آهن در سطح 4 در هزار عصاره یونجه در بستر تلقیح شده با PGPR در مقایسه با بستر عدم تلقیح وجود نداشت. سرانجام توصیه می­گردد تأثیر عصاره یونجه بر عملکرد و غلظت عناصر غذایی در دیگر گیاهان نیز بررسی شود.

Keywords [Persian]

  • واژه های کلیدی:
  • عصاره یونجه
  • عناصر غذایی
  • وزن خشک
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