نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکترای زراعت، گروه کشاورزی، واحد بیرجند، دانشگاه آزاد اسلامی، بیرجند
2 دانشیار مرکز تحقیقات کشاورزی، گیاهان دارویی و علوم دامی، واحد بیرجند، دانشگاه آزاد اسلامی، بیرجند
چکیده
به منظور ارزیابی تأثیر تنظیمکنندههای رشد بر عملکرد و ویژگیهای مورفوفنولوژیکی ارزن دم روباهی در شرایط تنش خشکی، آزمایشی به‌صورت کرتهای یک‌بار خردشده در قالب طرح بلوکهای کاملاً تصادفی با 3 تکرار در دو سال زراعی 1396 و 1397 در مزرعه آموزشی دانشگاه آزاد اسلامی واحد بیرجند انجام شد. تنش خشکی به‌عنوان عامل اصلی در سه سطح شامل (آبیاری در حد 100، 70 و 30 درصد نیاز آبی گیاه به ترتیب شاهد، تنش متوسط و شدید) و محلول‌پاشی تنظیمکنندههای رشد به‌عنوان عامل فرعی در پنج سطح شامل (عدم محلول‌پاشی، محلول‌پاشی اسید سالیسیلیک 1 میلی مولار، پوتریسین 1 میلی مولار، اسید هیومیک 1.5 کیلوگرم در هکتار و متانول 25 درصد حجمی) بودند. نتایج حاصله نشان داد با افزایش شدت تنش خشکی از تعداد روز تا ظهور پانیکول، تعداد روز تا رسیدگی فیزیولوژیک و طول دوره پر شدن دانه در هر دو سال کاسته شد. با کاهش نیاز آبی به 30 درصد، هر یک از صفات تعداد پانیکول بارور در مترمربع، تعداد دانه در پانیکول و وزن هزار دانه به ترتیب معادل 43.6، 34.2 و 10.4 درصد کاهش نشان دادند. بررسی اثر متقابل آبیاری در محلول‌پاشی نشان داد بهترین تیمار در شرایط آبیاری مطلوب، محلول‌پاشی اسید هیومیک بود که منجر به افزایش 28 درصدی عملکرد دانه نسبت به شاهد شد اما در شرایط تنش متوسط و شدید خشکی محلول‌پاشی متانول با بهبود 33 و 19.6 درصدی عملکرد دانه نسبت به شاهد در مقایسه با سایر تنظیمکنندههای رشد برتری داشت.
کلیدواژه‌ها
موضوعات
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