اثر هیومیک اسید بر کاهش اثرات تنش خشکی در گیاه گوجه‌فرنگی (Lycopersicum esculentum Mill.)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه باغبانی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ایران

2 دانش‌آموخته کارشناسی ارشد باغبانی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ایران

10.22034/iuvs.2020.63701.1016

چکیده

برای بررسی اثر کاربرد هیومیک اسید در کاهش تأثیرات تنش خشکی در گیاه گوجه‏فرنگی (Lycopersicum esculentum Mill.) آزمایشی به‌صورت فاکتوریل در قالب طرح بلوک‌های کامل تصادفی با نُه تیمار و سه تکرار شامل میزان آبیاری 100 (D1)، 50 (D2) و 25 (D3) درصد آب مورد نیاز گیاه بر حسب ظرفیت مزرعه به روش وزنی همراه با سه مقدار هیومیک اسید صفر (H1)، 500 (H2) و1000 (H3) میلی‏گرم در لیتر در شرایط گلخانه طراحی و اجرا شد. تنش خشکی باعث کاهش شاخص‌های اندازه‌گیری شده مانند محتوای کلروفیل، وزن تر شاخساره و ریشه، وزن خشک ریشه و تعداد میوه در بوته و هیومیک‌اسید باعث بهبود محتوای نسبی آب بافت، محتوای کلروفیل و وزن تر و خشک شاخساره شد. همچنین تیمار D2H3 باعث بهبود فاکتورهای اندازه‏گیری مانند محتوای کلروفیل، محتوای نسبی آب بافت، وزن تر شاخساره و ریشه و تیمار D3H2 موجب بهبود بعضی از شاخص‌های اندازه‌گیری مانند محتوای کلروفیل، محتوای نسبی آب بافت، وزن تر و خشک ریشه شد. محتوای کلروفیل، وزن تر ریشه و وزن خشک ریشه به‌ترتیب 20، 40 و 38 درصد در تیمار D3H2 افزایش یافت. اجزای عملکرد شامل تعداد میوه در بوته، وزن تر و خشک میوه تحت تأثیر تیمارهای هیومیک اسید و ظرفیت زراعی قرار نگرفتند. به‌طور کلی، اعمال 1000 میلی‏گرم در لیتر هیومیک اسید در شرایط تنش خشکی متوسط و 500 میلی‏گرم در لیتر هیومیک اسید در شرایط تنش شدید مؤثر بود.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Humic Acid on Alleviating Drought Stress Effects in Tomato (Lycopersicum esculentum Mill.)

نویسندگان [English]

  • Maryam Haghighi 1
  • Mohammad Ali Najafi 2
1 Associate Professor, Department of Horticulture, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran
2 M.Sc. Graduate, Department of Horticulture, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

To study the effect of humic acid on alleviating the deleterious effect of drought stress in tomato (Lycopersicum esculentum Mill.), a factorial experiment based on randomized complete block design with three replicates and nine treatments was conducted. The treatments were 100, 50 and 25 % of field capacity (FC) irrigation with three humic acid levels (0, 500 and 1000 mg.L-1). Drought stress caused decrease in chlorophyll content, fresh weight of shoot and root, dry weight of root and number of fruit per plant. Humic acid improved tissue relative water content, chlorophyll content and fresh and dry weight of shoot. Also, treatment with 50 percent FC and 1000 mg.L-1 humic acid improved chlorophyll and relative water content and fresh weight of shoots and roots. Similarly, treatment with 25 percent of FC and 500 mg.L-1 humic acid increased chlorophyll content, relative water content and fresh and dry weight of roots. The chlorophyll content, tissue relative water content and fresh weight of shoot and root increased 20, 40 and 38 percent, respectively in 25 % FC and 500 mg.L-1 humic acid. However, fruit numbers per plant, fresh and dry weight of fruit were not affected by the treatments significantly. In conclusion, 1000 mg.L-1 humic acid in moderate drought stress (50 % FC) with 500 mg.L-1 humic acid in high drought stress were effective to alleviate the adverse effect of drought stress.

کلیدواژه‌ها [English]

  • Field capacity
  • Chlorophyll
  • Tissue relative water
  • organic matter
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