اثر پتاسیم بر عملکرد دانه و غلظت برخی عناصر غذایی کم‌مصرف در لوبیا چشم بلبلی (Vigna unguiculata L.) در شرایط تنش خشکی

نوع مقاله: پژوهشی

نویسندگان

1 گروه علوم باغبانی دانشکده کشاورزی دانشگاه مراغه، مراغه، ایران

2 گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه مراغه، مراغه، ایران

چکیده

به منظور بررسی اثر تنش خشکی و کاربرد پتاسیم بر عملکرد دانه، برخی صفات بیوشیمایی و غلظت عناصر غذایی مس، روی و منگنز در گیاه لوبیا چشم بلبلی، آزمایشی به صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار در گلخانه دانشکده کشاورزی دانشگاه مراغه، در سال 1395 انجام گردید. در این آزمایش تیمارها شامل دو سطح آبیاری (نرمال یا 100 و 50 درصد ظرفیت مزرعه‌ای) و پتاسیم در پنج سطح (صفر، 30، 60، 90 و 120 میلی‌گرم در کیلوگرم از منبع سولفات پتاسیم) بود. نتایج آزمایش حاضر نشان داد که تنش خشکی منجر به کاهش شاخص­های رشد و غلظت عناصر در گیاهان گردید اما در مقابل کاربرد سطوح مختلف پتاسیم با تعدیل اثرهای تنش خشکی منجر به افزایش وزن خشک بخش هوایی، عملکرد دانه و کربوهیدرات گشت. علاوه بر این کاربرد پتاسیم با غلظت 120 میلی‌گرم باعث افزایش معنی‌دار غلظت عناصر غذایی همچون روی، مس و منگنز در گیاهان تحت تنش خشکی شد. بر اساس نتایج  به‌دست آمده در این آزمایش، به نظر می‌رسد پتاسیم با کاهش اثرات سو تنش موجب بهبود شاخص‌های رشد گیاهان گردید. لذا با توجه به معضل کم آبی در کشور می‌توان کود سولفات پتاسیم را به‌عنوان راهکاری جهت کاهش اثرهای تنش خشکی در کشت لوبیا چشم بلبلی توصیه نمود.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of potassium on the yield and concentrations of microelements in cowpea (Vigna unguiculata L. Walp.) under drought stress

نویسندگان [English]

  • seyed morteza zahedi 1
  • Farzad Rasoli 2
  • Gholamreza Gohari 2
1 Department of Horticultural Science, College of Agriculture, University of Maragheh, Maragheh, Iran
2 Department of Horticultural Science, College of Agriculture, University of Maragheh, Maragheh, Iran
چکیده [English]

In order to study the effect of drought stress and application of potassium on seed yield, some biochemical characteristics, and the content of micronutrients such as copper (Cu), zinc (Zn) and manganese (Mn) in cowpea, a factorial experiment was carried out in randomized complete block design with three replications in the greenhouse of the Faculty of Agriculture, University of Maragheh, Iran in 2016. Treatments were water stress at two levels (normal or 100% and 50% field capacity) as the first factor and potassium at five levels (0, 30, 60, 90, and 120 mg/kg) as the second factor. Results showed that drought stress reduced the growth parameters and the concentration of the elements in plants while application of different levels of potassium increased shoot dry weight, yield, and carbohydrate by adjusting the effects of drought stress. Also, application of 120 mg potassium in stress conditions caused an increase in the concentration of Cu, Zn and, Mn. Findings seem to suggest that potassium improves growth characteristics in cowpea by decreasing the undesirable consequences of drought stress. Therefore, application of potassium sulfate is recommended as a strategy to mitigate the effects of draught stress in cultivation of cowpea. 

کلیدواژه‌ها [English]

  • Biochemical
  • Irrigation levels
  • Potassium sulfate
  • Growth characteristic
  • Plant
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