اثرهای محلول‌پاشی اسید سالیسیلیک و اسپرمین بر مراحل فنولوژیک و عملکرد ترکیب‌های اسید کافئیکی گیاه سرخارگل (Echinacea purpurea L.) تحت تنش خشکی

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