نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه خاکشناسی، دانشکده کشاورزی، دانشگاه ارومیه

2 دانشگاه ارومیه

چکیده

به‌منظور بررسی سطوح مختلف نیتروژن و نسبت‌های مختلف نیترات به آمونیوم در شرایط شور و غیر شور بر غلظت سبزینه، عناصر غذایی و اسانس آویشن دنایی (Thymus daenensis subsp. daenensis Celak)، آزمایشی به‌صورت فاکتوریل در قالب طرح بلوک­های کامل تصادفی با 30 تیمار و 3 تکرار. با عامل‌های نیتروژن در سه سطح (5، 10و 15 میلی­مولار)، نسبت­های مختلف نیترات به آمونیوم در پنج سطح (100:0, 75:25, 50:50, 25:75, 0:100) و شوری در دو سطح (0 و50 میلی­مولار سدیم کلرید) در شرایط گلخانه انجام گرفت. نتایج نشان داد با افزایش سطوح نیتروژن غلظت عناصر غذایی، غلظت سبزینه، درصد و عملکرد اسانس افزایش یافت. همچنین تأثیر نسبت­های مختلف نیترات به آمونیوم نشان داد که با افزایش نیترات در محلول غذایی غلظت پتاسیم، سدیم و غلظت سبزینه در گیاه افزایش، و با افزایش آمونیوم در محلول غذایی غلظت نیتروژن، فسفر، آهن، مس و روی در بافت گیاهی افزایش یافت. شوری باعث کاهش غلظت عناصر غذایی، غلظت سبزینه و درصد اسانس و افزایش غلظت سدیم در بافت گیاهی شد. بیشترین درصد و عملکرد اسانس در شرایط غیر شور از نسبت 25:75 و در شرایط شور از نسبت 50:50 نیترات به آمونیوم به دست آمد. برای دستیابی به بیشترین درصد و عملکرد اسانس از سطح نیتروژن 15 میلی­مولار و در شرایط غیر شور از نسبت 25:75 نیترات به آمونیوم و در شرایط شور از نسبت 50:50 نیترات به آمونیوم استفاده شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of different levels of nitrogen and different ratios of nitrate: ammonium on chemical composition and essential oil of denaii thyme in saline and non-saline conditions

نویسندگان [English]

  • simin shahoori 1
  • ebrahim sepehr 2
  • amir rahimi 2

1 Dept. of Soil science, Faculty of Agriculture, Urmia University, Iran

2 urmia

چکیده [English]

In order to study the different levels of nitrogen and different nitrate: ammonium ratios in saline and non-saline conditions on the content of chlorophyll, the amount of nutrients and essential oil of denaii thyme, a factorial experiment was conducted in a randomized complete block design with 30 treatments and 3 replications. Nitrogen in three levels (5, 10 and 15 mM), nitrate: ammonium ratios in five levels (100: 0, 75:25, 50:50, 25:75, 0: 100) and salinity in two levels (0 and 50 mM Sodium Chloride) were treated. Results showed that the concentration of nutrients, chlorophyll content and essential oil yield were increased by increasing in nitrogen amount. In terms of different nitrate: ammonium ratios, the concentration of potassium, sodium and chlorophyll content in plant were increased by increasing nitrate ratio, whereas the concentration of nitrogen, phosphorus, iron, copper and zinc in plant tissues were increased by increasing ammonium ratio. Salinity reduced the concentration of nutrients, chlorophyll content and essential oil percentage and increased sodium concentration in plant tissues. The highest percentage and yield of essential oil were obtained from the 75:25 ratio in non- saline conditions and from 50:50 ratio in saline conditions.

کلیدواژه‌ها [English]

  • Nitrogen
  • Nitrate
  • Ammonium
  • Salinity
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