تعیین دوره بحرانی کنترل علف‌های هرز کتان روغنی (Linum usitatissimum L.) در یاسوج

نوع مقاله : مقالات پژوهشی

نویسندگان

1 گروه زراعت، دانشکده کشاورزی دانشگاه یاسوج

2 دانشیار گروه زراعت واصلاح نباتات، دانشکده کشاورزی، دانشگاه یاسوج

3 دانشیار گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه یاسوج

4 دانشجوی کارشناسی زراعت، گروه زراعت و اصلاح نباتات ، دانشکده کشاورزی، دانشگاه یاسوج

چکیده

به منظور تعیین دوره بحرانی کنترل علف‌های هرز کتان روغنی (Linum usitatissimum L.) آزمایشی در سال زراعی 96-1395 در قالب طرح بلوک‌های کامل تصادفی با 14 تیمار و سه تکرار در مزرعه تحقیقاتی دانشگاه یاسوج اجرا شد. تیمارها شامل دو گروه، گروه اول به صورت حذف علف‌های هرز (عاری از علف هرز) تا 10، 20، 30، 40، 50 و 60 روز پس از سبز شدن کتان روغنی و سپس حفظ آن‌ها اعمال شد و گروه دوم، به صورت حفظ علف‌های هرز (تداخل) تا زمان‌های فوق و سپس حذف آن‌ها اعمال شد. دو تیمار شاهد تداخل و کنترل تمام فصل (110روز) نیز در نظر گرفته شد. با افزایش طول دوره‌های تداخل علف‌های هرز، عملکرد دانه، عملکرد روغن، پروتئین دانه، تعداد کپسول، تعداد دانه در کپسول، وزن هزار دانه و میزان عناصر‌غذایی دانه (آهن، روی، فسفر و پتاسیم) کاهش معنی‌داری یافتند. ولی افزایش طول دوره‌ی کنترل منجر به افزایش این صفات شد که در همه موارد جز در فسفر دانه این روند افزایشی، معنی‌دار بود. در کل تاثیر منفی رقابت علف هرز بر صفات عملکردی و جذب عناصر در اول فصل بیشتر از باقی طول رشد گیاه بود. با اینکه افزایش طول دوره‌های تداخل علف‌های هرز، باعث افزایش معنی‌دار وزن خشک علف‌های هرز گشت ولی اثر آن بر تراکم علف‌های هرز معنی‌دار نبود. با افزایش طول دوره‌های کنترل، وزن‌خشک علف‌های هرز و تراکم آن‌ها کاهش معنی‌داری یافت. دوره بحرانی کنترل علف‌های هرز برای کتان روغنی با در نظر گرفتن کاهش مجاز 10 درصد عملکرد دانه، 5 تا 44 روز پس از سبز شدن کتان روغنی تعیین شد.

کلیدواژه‌ها

موضوعات

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