تاثیر سطوح مختلف نیترات در محلول‌غذایی برخصوصیات مورفولوژیک و فیزیولوژیک سجافی (Chlorophytum comosum)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای دانشکده فناوری کشاورزی (ابوریحان) دانشگاه تهران.تهران، ایران.

2 استادیار دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران،کرج، ایران.

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

چکیده

جهت ارزیابی تاثیر سطوح مختلف نیترات بر شاخص‌های رشدی و فیزیولوژیکی گیاه سجافی (Chlorophytum Comosum) آزمایشی بر پایه طرح بلوک‌های کامل تصادفی با 4 تیمار و 3 تکرار به اجرا درآمد. تیمارها شامل چهار سطح مختلف نیترات 5/2 (به‌ عنوان شاهد)، 5، 5/7 و10 میلی‌‎مولار بود که از نیترات آمونیوم، نیترات کلسیم و نیترات پتاسیم به منظور تامین منبع نیترات در محلول‌غذایی استفاده گردید. محلول‌دهی دو بار در هفته انجام شد. صفات مورد بررسی شامل ویژگی های مورفولوژیک (ارتفاع، تعداد برگ، وزن‌ گلدان، وزن ‌تر ‌اندام ‌هوایی، وزن‌ خشک ‌اندام ‌هوایی، وزن ‌تر ‌ریشه، وزن‌ خشک‌ ریشه، عمق ‌ریشه، حجم ‌ریشه، طول ریشه، سطح‌ برگ) و ویژگی های فیزیولوژیک (کلروفیل کل، مقدار ‌پروتئین موجود در بافت، مقدار نیترات موجود در بافت و میزان پرولین) اندازه‌گیری شد و همچنین آنالیز بسترکشت پیش از شروع آزمایش انجام شد. بیشترین میزان ارتفاع، تعداد برگ، وزن ‌‌تر ‌اندام ‌هوایی، وزن‌ خشک ‌اندام ‌هوایی، وزن‌ خشک‌ ریشه، سطح‌ برگ‌ و حجم‌ ریشه در غلظت 5/7 میلی‌مولار نیترات مشاهده گردید. با افزایش سطوح نیترات مقدار پروتئین موجود در بافت، نیترات موجود در بافت، نیترات موجود در زهاب، کلروفیل کل و پرولین افزایش یافت. با توجه به نتایج بدست آمده تیمار 5/7 میلی‌مولار نیترات، موجب افزایش شاخص‌های رشد، عملکرد و افزایش جنبه زینتی گیاه سجافی به عنوان یک گیاه برگ زینتی گردید.

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