تأثیر هدایت‌ الکتریکی محلول غذایی بر رشد و نمو گل رز شاخه بریدۀ رقم ’دولسویتا‘ در نظام آبکشت

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

3 دانشیار، گروه خاکشناسی دانشکدۀ کشاورزی دانشگاه تربیت مدرس

چکیده

تولید گل رز تابعی از صفات ژنتیکی و ویژگی­های محیطی از جمله کمیت و کیفیت آب آبیاری است. با توجه به محدودیت دسترسی به منابع آب با کیفیت در اغلب دشت­های کشور، در این پژوهش تأثیر هدایت الکتریکی آب آبیاری ناشی از افزایش غلظت سدیم­کلراید بر عملکرد کمی و کیفی گل رز رقم دولسویتا در نظام آبکشت (هیدروپونیک) بررسی شد. تیمارهای آزمایشی شامل محلول غذایی با چهار سطح هدایت الکتریکی 6/1، 8/1، 0/2 و 2/2 دسی­زیمنس بر متر، به ترتیب 18/3، 57/4، 69/5 و 87/6 میلی­مولار سدیم و 58/1، 71/2، 76/3 و 11/5 میلی­مولار کلراید، داشت. نتایج نشان داد، در صورت تنظیم بهینۀ غلظت و نسبت یون‌ها در فرمول محلول غذایی، تیمارهای آزمایشی نه‌تنها بر عملکرد کمی و کیفی گل رز رقم دولسویتا تأثیر معنی­داری ندارند، بلکه با افزایش هدایت الکتریکی سنگ‌گیری گلبرگ­ها مقداری بهبود می‌یابد. به‌رغم اعمال 40 درصد کسر آبشویی، هدایت ­الکتریکی زهاب گلدان­ها به‌تدریج افزایش یافت. همچنین با افزایش غلظت یون­های سدیم و کلراید، تنها غلظت کلراید در بافت برگ­ها به‌طور معنی­داری افزایش یافت. درمجموع نتایج این پژوهش نشان داد، با بهینه‌سازی فرمول محلول غذایی، گل رز رقم دولسویتا تغییر در هدایت الکتریکی محلول غذایی در بازۀ 6/1 تا 2/2 دسی­زیمنس بر متر (ناشی از افزایش سدیم کلراید) را بدون کاهش در عملکرد و یا کیفیت تحمل می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of electrical conductivity of nutrient solution on growth and development of rose cut flower cv. Dolce vita in hydroponic system

نویسندگان [English]

  • Davoud Asgari 1
  • Mohsen Kafi 2
  • Rouhangiz Naderi 2
  • Rasoul Rahnemaie 3
1 Former Ph.D. Student and Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
2 Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
3 Associate Professor, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Rose production is a function of the genetic traits and environmental characteristics, including quantity and quality of the irrigation water. Due to the limitation in availability of high quality water resources in most regions of Iran, the effect of electrical conductivity of irrigation water (due to variation in sodium chloride concentration) was investigated on the yield and quality of rose cv. Dolce vita in hydroponic system. The experimental treatments included four nutrient solutions with different electrical conductivities of 1.6, 1.8, 2.0 and 2.2 dS m-1 containing 3.18, 4.57, 5.69 and 6.87 mM sodium and 1.58, 2.71, 3.76 and 5.11 mM chloride concentrations, respectively. Results indicated that treatments not only had no significant effect on quantitative and qualitative performance of rose cv. Dolce vita, but also they improved petal pigmentation only if ions concentrations and ions ratios were properly adjusted in the nutrient solutions. Despite applying 40 percent leaching fraction, electrical conductivities of pots drain water were gradually increased. In addition, by increasing sodium and chloride ions concentrations, only chloride concentration was significantly increased in leaf tissue. Overall, results of this research indicated that by optimizing the nutrient solution, rose cv. Dolce vita tolerated variation in electrical conductivity of nutrient solutions in the range of 1.6 to 2.2 dS m-1 (because of variation in NaCl concentration) without any reduction in performance or quality.

کلیدواژه‌ها [English]

  • Chloride
  • hydroponic
  • ion composition
  • potassium
  • sodium
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