عملکرد دانه و صفات رشدی جو (Hordeum vulgare L) در تداخل با یولاف وحشی (Avena ludoviciana L)

نوع مقاله: علمی پژوهشی

نویسنده

استادیار گروه زراعت و اصلاح نباتات، واحد میاندوآب، دانشگاه آزاد اسلامی، میاندوآب، ایران

چکیده

جهت بررسی تاثیر تداخل بین جو زراعی و یولاف وحشی بر روی عملکرد دانه، ویژگی­ های برگ پرچم و نسبت ریشه به ساقه، آزمایشی گلدانی در قالب طرح کاملاً تصادفی انجام شد. این آزمایش دارای چهار سطح تداخل شامل شاهد (عدم تداخل)، تداخل کامل، تداخل ریشه‌ای و تداخل اندام هوایی جو زراعی با یولاف وحشی و چهار سطح تراکم یولاف وحشی (2، 4، 6 و 8 بوته در گلدان) در چهار تکرار بود. تاثیر تداخل کامل و تداخل ریشه‌ای بر روی جو زراعی و یولاف وحشی به مراتب بیشتر از تداخل اندام هوایی بود. تفاوت مشهودی بین تداخل ریشه‌ای و کامل در هر دو گونه جو و یولاف وحشی مشاهده نشد. میزان کاهش عملکرد دانه جو در تداخل هوایی، تداخل ریشه‌ای و تداخل کامل با یولاف وحشی نسبت به شاهد (عدم تداخل) به­ ترتیب 28.75، 73.09 و 77.22 درصد برآورد شدند. مشخص شد که تداخل ریشه­ ها موجب افزایش قدرت رقابتی یولاف وحشی نسب به جو زراعی و در نتیجه تشدید رقابت بر سر منابع مورد استفاده گردید. با بررسی منحنی­ های رگرسیونی مشاهده شد که با افزایش تراکم یولاف وحشی سرعت افت عملکرد دانه در بوته، سطح برگ پرچم و میزان کلروفیل برگ پرچم جو زراعی کاهش می­ یابد. با افزایش تراکم یولاف وحشی و شدت یافتن رقابت نسبت ریشه به ساقه در جو زراعی و یولاف وحشی افزایش یافت. این امر نشانگر حساسیت بیشتر اندام هوایی نسبت به سیستم ریشه در برابر رقابت است. میزان این نسبت در یولاف وحشی به مراتب بیشتر از جو زراعی بود که دلیل آن قدرت بیشتر ریشه­ دهی یولاف وحشی نسبت به جو زراعی است. 

کلیدواژه‌ها


عنوان مقاله [English]

Grain Yield and Growth Traits of Barley (Hordeum vulgare L.) as Affected by Interference with Wild Oat (Avena ludoviciana L.)

نویسنده [English]

  • Farshad Sorkhi
Assistant Prof., Dept. of Agronomy, Faculty of Agriculture, Miandoab Branch, Islamic Azad University, Miandoab, Iran
چکیده [English]

A pot experiment was performed to investigate the effects of root, shoot and full plant interference of barley by wild oat on leaf characteristics and root to shoot ratio. This experiment was conducted as factorial based on randomized complete design with four replications. The treatments consisted of four interference levels control, root, shoot and full plant interferences) and four wild oat densities (2, 4, 6 and 8 plants/pot). The effects of full plant and root interferences of barley and wild oat traits were higher than shoot interference. Full and below ground interactions of both species decreased the grain yield, flag leaf area and its chlorophyll content significantly, as compared to above ground interaction and control. All traits under study of wild oat were reduced by above ground interaction compared to control. Grain yield of barley and wild oat showed highest sensitivity to interaction of treatments. There was no significant difference between full and root interferences. Increasing plant density of wild oat decreased per plant seed yield, flag leaf area and chlorophyll content of barley leaf. Reduction of barley grain yield concering root, shoot and full interferences, as compared with control, were 28.75, 73.09 and 77.22 percent respectively. Results also revealed that interference of roots increased competitative ability of oats against barley. This indicates higher sensitivity of shoot than root to interference competition. This ratio for wild oat was more than barley. Therefore wild oat has higher rooting ability as compared to barley.  

کلیدواژه‌ها [English]

  • barley
  • Interference
  • leaf
  • Root
  • wild oat
  • yield

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