جذب و کارایی جذب نور در ارقام تک شاخه و چند شاخه کنجد (Sesamum indicum L.) تحت تاثیر رقابت تاج خروس ریشه قرمز ((Amaranthus retroflexus L.

نوع مقاله : مقاله پژوهشی

نویسندگان

استاد دانشگاه

چکیده

به منظور بررسی اثر تداخل علف‌هرز تاج خروس بر قابلیت جذب، مصرف، و میزان نور دریافتی توسط کنجد، در سال1387 آزمایشی به صورت فاکتوریل در قالب طرح بلوک‌های کامل تصادفی با سه تکرار در مزرعه پژوهشی پردیس کشاورزی و منابع طبیعی دانشگاه تهران اجرا شد. عوامل مورد بررسی در این آزمایش شامل تراکم‌های مختلف تاج خروس (0 ،2، 4، 8، 16 در مترمربع) و ارقام کنجد (اولتان، ناز تک‌شاخه، ورامین2822 و کرج 1) بودند. نتایج نشان داد که توزیع سطح برگ گونه‌ها در طول تاج پوشه دارای تابع مثلثی است و ارتفاعی که در آن حداکثر تراکم سطح برگ قرار دارد در بین ارقام مختلف کنجد و تراکم‌های مختلف تاج خروس متفاوت بود. با افزایش تراکم علف‌هرز تاج خروس و شاخص سطح برگ آنها، از میزان جذب نور توسط ارقام مختلف کنجد کاسته شد و ارقام اولتان، ورامین‌2822، کرج ‌1 و ناز تک‌ شاخه در شرایط رقابت با تاج خروس به‌ترتیب 12، 47، 32، و42 درصد کاهش جذب نور در مقایسه با تیمار شاهد داشتند. متوسط کارایی مصرف نور در ارقام اولتان، ورامین‌2822، کرج‌1 و ناز تک ‌شاخه به ترتیب 18.6، 35، 7/27 و7/21 درصد در تراکم‌های مورد آزمایش تاج خروس کاهش یافت. بالاترین کارایی مصرف نور را رقم اولتان داشت.

کلیدواژه‌ها

عنوان مقاله [English]

Light Interception and Radiation use Efficiency (RUE) of Sesame Cultivars as Affected by Interference the Redroot Pigweed (Amaranthus retroflexus L.) Different Densities

نویسندگان [English]

  • saeid shahbazi
  • hamid rahimian mashadi
  • hassan alizadeh
چکیده [English]

Field experiment was carried out during 2008 growing season at the research farm of University of Tehran, Karaj, Iran, to evaluate the interference effects of redroot pigweed (Amaranthus retroflexus L.) on light interception and RUE of four Sesame cultivars. Experimental design was a randomized complete block with three replications per treatment. The first factor was the sesame cultivars including, Otlan (Multiculum), Varamin 2822, Naz Uniculm and Karaj 1 (Uniculm cultivars). The second was the redroot pigweed density at five levels: 0, 2, 4, 8, and 16 plant m2. The results indicated that leaf area distribution in the canopy has a triangular function and the height, in which maximum leaf area redroot pigweed was observed, was not the same among treatments. Light interception by sesame cultivars under redroot pigweed interference decreased by 12, 47, 32, and 42 percent for Oltan, Varamin 2822, Naz Uniculum and Karaj 1, respectively, compared to control. Redroot pigweed interference reduced RUE by 18.6, 35, 27.7, and 21.7 percent for Oltan, Varamin 2822, Naz Uniculum and Karaj1 respectively, compared to control. The highest RUE was observed in Oltan cultivar

کلیدواژه‌ها [English]

  • interference
  • dendity
  • LAI
  • Radiation Use Efficiency

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