مطالعه رشد و عملکرد خیار گلخانه‌ای تحت تأثیر هدایت الکتریکی محلول غذایی و تعداد گل در ‏گره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

2 دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

3 استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

4 استادیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

چکیده

علاوه بر فراهمی مواد غذایی در محیط ریشه، میزان مواد فتوسنتزی در دسترس ریشه به‌عنوان تأمین کننده اسکلت کربنی و انرژی، نیز بر میزان جذب عناصر غذایی، رشد و عملکرد گیاهان تأثیرگذار می‌باشد. هر عاملی که سبب تغییر دسترسی به عناصر غذایی یا تغییر الگوی توزیع مواد فتوسنتزی گردد می­تواند بر فرایند جذب و رشد نیز تأثیرگذار باشد. در این پژوهش اثر تعداد گل و غلظت محلول غذایی بر رشد و عملکرد خیار گلخانه‌ای در قالب آزمایش فاکتوریل بر پایه طرح بلوک­های کامل تصادفی مورد بررسی قرارگرفت. تیمارها شامل سه سطح گل در گره (نگهداری یک، دو یا سه گل در هر گره) و 5 سطح هدایت الکتریکی محلول غذایی (ECهای 1/1، 5/1، 15/2، 78/2 و 32/3 دسی‌زیمنس بر متر) بودند. نتایج نشان داد که گیاهان تیمار شده با ECهای 15/2 علاوه بر رشد شاخساره از لحاظ میزان نیتروژن و فسفر برگی نیز مقادیر بیشتری داشتند و بیشترین عملکرد نیز در گیاهان تیمار شده با ECهای 5/1 و 15/2 دسی‌زیمنس بر متر مشاهده شد. با افزایش تعداد گل در گره عملکرد گیاهان در کوتاه‌مدت (80 روز بعد از انتقال نشا) افزایش نشان داد، اما با افزایش دوره پرورش (130 روز بعد از انتقال نشا) بین تیمار­های مورد بررسی اختلاف معنی­داری در عملکرد مشاهده نشد. افزایش تعداد گل در گره در کوتاه‌مدت، موجب تخصیص بیشتر مواد فتوسنتزی به میوه‌ها شد ولی احتمالاً به علت پتانسیل کم منابع (sources) در دراز مدت، این اثر افزایش تعداد گل بر عملکرد به‌صورت فیزیولوژیکی مورد تعدیل قرار گرفت.

کلیدواژه‌ها


عنوان مقاله [English]

Growth and yield of greenhouse cucumber as influenced by nutrient solution EC and ‎number of flowers per node ‎

نویسندگان [English]

  • Naser Heydari 1
  • Mojtaba Delshad 2
  • Mesbah Babalar 3
  • Reza Salehi 4
1 Ph.D. Candidate, College of Agriculture & Natural Resources, University of ‎Tehran, Karaj, Iran
2 Associate Professor,, College of Agriculture & Natural Resources, University of Tehran, Karaj, ‎Iran
3 Professor, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
4 Assistant Professor, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

The nutrient uptake, growth and yield of plants depend on nutrients availability in rhizosphere and also on amount of assimilates available in root as carbon skeleton and energy source. Any factor affecting nutrients availability or assimilate partitioning pattern can also affect uptake phenomenon and growth. In this study, the effects of number of flowers per node and nutrient solution concentration on growth pattern and yield of greenhouse cucumber plants were studied using a factorial experiment based on complete randomized block design. Factors consisted of: three levels of number of flowers per node (keeping one, two or three flowers per node) and 5 levels of electrical conductivity of nutrient solution (EC of 1.1, 1.5, 2.15, 2.78 and 3.32 dS/m). Results showed in addition to shoot growth, plants treated with 2.15 EC had higher nitrogen and phosphorous content. The highest yield was observed in plants treated with EC of 1.5 and 2.15 dS/m. Increasing number of flowers per node resulted in increasing in fruit yield in short term (80 days after transplanting) but, no significant differences were observed among treatments when the experiment proceeded (130 day after transplanting). Increase in number of flowers per node led to more allocation of assimilates to fruits, but probably due to low potential of sources this effect of number of flowers on yield has been physiologically controlled.

کلیدواژه‌ها [English]

  • Electrical conductivity
  • fruit abortion
  • harvest index
  • sink and source
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