اثر محلول‌پاشی قبل از برداشت فولویک اسید بر برخی ویژگی‌های کیفی و آنتی‌اکسیدانی انگور رقم فخری (Vitis vinifera cv Fakhri)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، دانشکده کشاورزی، دانشگاه زنجان

2 دانشیار، دانشکده کشاورزی، دانشگاه زنجان

3 استادیار، دانشکده کشاورزی، دانشگاه زنجان

چکیده

استفاده بیش از حد کودهای شیمیایی، مشکلات زیست­محیطی زیادی ایجاد کرده است؛ بنابراین به­کارگیری ترکیبات ارگانیک و هیومیکی، مخصوصا فولویک اسید، در تولید محصولات باغی مورد توجه قرار گرفته است. این پژوهش به­منظور بررسی تأثیر فولویک اسید بر صفات کیفی و آنتی­اکسیدانی انگور رقم فخری سفید در چهار سطح صفر، 5/2، 5 و 10 گرم در لیتر به­صورت محلول‌پاشی برگی در قالب طرح بلوک‌های کامل تصادفی با سه تکرار انجام شد. تاک­ها به­صورت خزنده سنتی پرورش یافته بودند. محلول‌پاشی تاک­ها در سه مرحله 1- تشکیل میوه 2- ساچمه­ای­شدن حبه­ها 3- زمان تغییر رنگ حبه­ها انجام شد. پس از برداشت (با درجه بریکس 20)، ویژگی­های کیفی و آنتی­اکسیدانی میوه­ها مورد ارزیابی قرار گرفت. نتایج آزمایش نشان داد که تیمار 5/2 گرم در لیتر فولویک اسید به­طور معنی­داری مواد جامد محلول، ویتامین ث، قندهای محلول، فنل کل، ظرفیت آنتی­اکسیدانی میوه­ها، میزان کلروفیل و پتاسیم برگ را افزایش داد و تیمار 10 گرم در لیتر فولویک اسید، فقط باعث افزایش اسید قابل تیتراسیون میوه­ها شد. با افزایش غلظت فولویک اسید، اثر آن بر صفات ارزیابی­شده کاهش یافت؛ به­طوری­که تیمار 10 گرم در لیتر، اثر معنی­داری در بهبود کیفیت و ویژگی­های آنتی­اکسیدانی میوه نداشت. همچنین تیمار فولویک اسید بر فلاونوئید­ کل میوه، کارتنوئید، فسفر و نیتروژن برگ مؤثر نبود. به­عنوان نتیجه نهائی، تیمار فولویک اسید اثر مهمی بر بهبود خواص کیفی و آنتی‌اکسیدانی انگور رقم فخری سفید داشت و غلظت 5/2 گرم در لیتر بر صفات تأثیر بیشتری داشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Impacts of preharvest sprays of fulvic acid on some quality and antioxidant properties of grapes the Fakhry Cultivar (Vitis vinifera cv Fakhri)

نویسندگان [English]

  • Mohsen Mozaffari 1
  • Vali Rabiei 2
  • Farhang Razavi 3
  • Azizollah Kheiry 3
  • Akbar Hassani 3
1 Former M. Sc. Student, of Agriculture, University of Zanjan, Zanjan, Iran
2 Associate Professor , Faculty of Agriculture, University of Zanjan, Zanjan, Iran
3 Assistant Professor, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
چکیده [English]

The excessive use of chemical fertilizers has caused a lot of environmental problems, so the use of organic and humic compounds, especially fulvic acid, has been considered in the production of horticultural crops. This research was carried out to evaluate the effect of foliar application of fulvic acid on quality and antioxidant properties of grapevine cv. Fakhri at four levels (0, 2.5, 5 and 10 g/l) using a randomized complete block design with three replications. Grapes were cultivated in a traditional traning system. The vines were sprayed at three stages: 1- Berry formation, 2- Lag phase, 3- Veraison. After harvesting, (Brix 20) qualitative and antioxidant properties of fruits were evaluated. Results of the experiment showed that 2.5 g/l of fulvic acid significantly increased soluble solids, vitamin C, soluble sugars, total phenol, antioxidant capacity of fruits, chlorophyll and leaf potassium content while 10 g/l of fulvic acid increased only titratable acidity of fruits. With increasing fulvic acid concentration evaluated traits decreased, so that 10 g/l fulvic acid did not show significant effect on improving qualitative and antioxidant properties of fruits. Application of fulvic acid did not show significant effect on fruit flavonoid, and carotenoid, phosphorus and nitrogen contents of leaves. As final result, fulvic acid treatment had an important effect on improving the qualitative and antioxidant properties of Fakhri cultivar and 2.5 g/l had the highest effect which is recommended to be considered as a best concentration.

کلیدواژه‌ها [English]

  • biochemical traits
  • potassium
  • titratable acidity
  • total phenol
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