نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد زراعت، دانشکده کشاورزی دانشگاه یاسوج

2 استادیار، گروه زراعت و اصلاح نباتات دانشکده کشاورزی دانشگاه یاسوج

چکیده

به منظور ارزیابی تأثیر محلول‌پاشی هیومیک اسید بر عملکرد و اجزای عملکرد ارزن معمولی در شرایط تنش خشکی آزمایشی به‌صورت کرت‌های خردشده در قالب طرح پایه‌ی بلوک‌های کامل تصادفی با سه تکرار در سال زراعی 1394 در مزرعه واقع در منطقه رامجرد استان فارس اجرا شد. رژیم آبیاری به‌عنوان عامل اصلی شامل دو سطح آبیاری نرمال و تنش خشکی (قطع آبیاری) در مرحله 50 درصد گلدهی و عامل فرعی نیز شامل محلول‌پاشی کود هیومیک ‌اسید در پنج سطح (7،5،3،1 درصد و آب خالص به‌عنوان شاهد) در نظر گرفته شدند. نتایج حاصل از پژوهش نشان داد تنش خشکی باعث کاهش معنی‌داری در اکثر صفات مورفولوژیک موردمطالعه شد اما هیومیک اسید تا حد زیادی اثرات تنش خشکی را کنترل و درنهایت عملکرد تیمارهای هیومیک اسید بیشتر از تیمار محلول‌پاشی با آب (شاهد) بود. نکته قابل‌توجه در این پژوهش روند تغییرات صفات بیوشیمیایی در تیمارهای تنش به‌گونه‌ای بود که با افزایش درصد هیومیک اسید، پرولین، آنزیم سوپراکسید دیسموتاز و پراکسیداز کاهش پیدا کردند، در حالی‌که که باعث افزایش میزان کلروفیل شد، که این مسئله بیانگر تأثیر مثبت هیومیک اسید در کاهش اثرات تنش خشکی می‌باشد. به‌طور کلی ما می‌توانیم نتیجه بگیریم که استفاده از محلول‌پاشی هیومیک اسید از طریق کاهش اثرات تنش خشکی در ارزن، باعث افزایش تعداد خوشه در متر مربع، تعداد دانه در خوشه، وزن هزار دانه و عملکرد دانه گردید.

کلیدواژه‌ها

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