Investigation of Humic Acid Application on Some Morphological and Physiological Characteristics of China Rose
محورهای موضوعی : مجله گیاهان زینتی
Parvin Talebi
1
(Department of Horticultural Science, College of Agriculture, Urmia University, Orumieh, Iran)
Zohreh Jabbarzadeh
2
(Department of Horticultural Science, College of Agriculture, Urmia University, Orumieh, Iran)
کلید واژه: Growth indices, Chlorophyll, Foliar application, Anthocyanin, <i>Rosa chinensis</i>,
چکیده مقاله :
In recent years, excessive use of chemical fertilizers and lack of organic fertilizers caused to reduce the rate of soil organic matter in Iran. The increased use of chemical fertilizers in agriculture causes environmental problems such as soil physical degradation and soil nutrient imbalances. This study was conducted to investigate the effects of foliar and soil applications of humic acid on some morphological and physiological characteristics of Rosa chinensis ‘Baby Masquerade’ in the completely randomized design with two factors; four concentrations of humic acid (0, 500, 1,000 and 2000 mg/L) and two application methods (soil and foliar application) for 8 times (every 15 days) with three replications and two observations per replication under controlled greenhouse conditions. The results showed that humic acid had additive effects on anthocyanin and total soluble solids content. It should be noted that increasing of the content of total soluble solids cause to increase anthocyanin. Foliar application of 500 mg/Lhumic acid significantly increased chlorophyll content and photosynthetic rate. Also, foliar application of 1000 mg/Lhumic acid increased the total soluble solid content more than the other treatments. Humic acid had significant effects on leaf area index and shoot and root fresh and dry weight. Generally, it seems that humic acid can improve morphological and physiological characteristics of Rosa chinensis var. ‘Minima’.
در سال های اخیر، استفاده بیش از حد از کودهای شیمیایی و کمبود مواد آلی سبب کاهش میزان ماده آلی خاک در ایران شده است. افزایش استفاده از کودهای شیمیایی در کشاورزی سبب ایجاد مسائل زیست محیطی نظیر تخریب فیزیکی خاک و به هم خوردن تعادل غذایی خاک شده است. از این رو در حال حاضر، کاربرد کودهای آلی افزایش می یابد. به منظور بررسی اثرات کاربرد اسید هیومیک بر برخی ویژگی های مورفولوژیکی و فیزیولوژیکی رز مینیاتور رقم هفت رنگ، آزمایشی به صورت فاکتوریل در قالب طرح کاملا تصادفی با دو فاکتور غلظت اسید هیومیک در چهار سطح (0، 500، 1000 و 2000 میلی گرم در لیتر) و نحوه کاربرد آن به دو شیوه (کاربرد خاکی و محلول‌پاشی برگی) 5 بار با فاصله 15 روز یک‌بار با 3 تکرار و 2 مشاهده انجام شد. نتایج نشان داد که اسید هیومیک سبب افزایش میزان آنتوسیانین و قندهای محلول برگ ها شد. محلول‌پاشی برگی 500 میلی گرم در لیتر اسید هیومیک، به طور معنی داری میزان کلروفیل و فتوسنتز را افزایش داد. همچنین محلول‌پاشی برگی با 1000 میلی گرم در لیتر اسید هیومیک، میزان قندهای محلول را بیش از سایر تیمارها افزایش داد. اسید هیومیک تاثیر معنی داری بر شاخص سطح برگ و وزن تر ریشه ها داشت. در مجموع به نظر می رسد تغذیه گیاهان با اسید هیومیک سبب بهبود ویژگی های مورفولوژیکی و فیزیولوژیکی گل رز مینیاتور گردد.
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