عکس العمل فیزیولوژیک خارشتر به مدیریت بقایای ریشه در زمان آیش

نوع مقاله: مقاله پژوهشی

نویسندگان

1 محقق

2 استاد

چکیده

بمنظور ارزیابی توان جوانه زنی بالقوه ریشههای ریزومی قطع شده خارشتر بهعنوان شاخصی از امکان رشد مجدد آن پساز اعمال مدیریت مکانیکی، آزمایشهای متعددی در مرکز تحقیقات کشاورزی و منابع طبیعی خراسان رضوی طی سال های 1384-85 به اجرا درآمد. مقاطع میکروسکپی ریشه تهیه گردید تا ماهیت ریزومی آن مشخصگردد. اثرات قطع ریشه در مزرعه مورد آزمون قرار گرفت. بدین منظور در یک مزرعه کاملا پوشیده از خارشتر، سه عمق 20 ،10 و 30 سانتیمتری شخم در طی فصل آیش اعمال گردید. 30 ،20 و 50 روز بعد از اعمال تیمارها تعداد ریشه های قطع شده ای که مجددا جوانه زده بودند ثبت گردید. توان رویش مجدد بخشپایینی ریشههای تیمار شده در عمق خاک نیز مورد بررسی قرار گرفت. بدین منظور ریشه خارشتر از 4 عمق 20 ،10 ،0 و 30 سانتیمتری از سطح خاک در یک مزرعه با توزیع طبیعی گیاه ، قطع گردید. تاریخ جوانه زنی، ارتفاع گیاه، سطح سایه انداز کانوپی، تعداد شاخه ها و ماده خشکدر رویشهای مجدد 10 ،7 41 ،34 ،24 ،17 و 58 روز پساز اعمال تیمار ها یادداشت گردیدند. شاخصهای رشد ازجمله سرعت رشد گیاه و سرعت جوانه زنی نیز محاسبه گردیدند. نتایج نشان دادند که تفاوت معنی داری در توان جوانه زنی ریشه ها با طول قطع متفاوت در مزرعه وجود دارد..در عین حال هیچیک از ریزوم های کاشت شده در گلدان ها قادر به جوانه زنی نبودند. عمق قطع تاثیر معنیداری بر ویژگی های رشد این گیاه داشت. ارتفاع نهایی، سطح سایه اندازو وزن خشک تک بوته توسط افزایش عمق به شدت کاهش یافتند. میتوان نتیجه گرفت که با افزایش عمق قطع تا 30 سانتیمتر امکان مدیریت موفق تر خارشتر وجود خواهد داشت.

کلیدواژه‌ها


عنوان مقاله [English]

Physiological Response of Alhagi pseudoalhagi to Root Exhausting Management During Fallow Season

نویسندگان [English]

  • mohammad bazobandi 1
  • mohammad barati 1
  • rasoul sadrabadi haghighi 2
چکیده [English]

A series of experiments were conducted in Khorasan Agricultural and Natural Resources Research Center (Mashhad, Iran) to evaluate potential germination ability of detached rhizomatous roots as an index of recovery after mechanical management during 2005-2006. Microscopic cross sections were prepared to study the rhizomatous nature of the roots. Effects of the in situ root detaching were examined. Three depths of plough i.e. 10, 20 and 30cm were applied at a field highly infected with camelthorn (Alhagi pseudoalhagi) during fallow season. Samples were taken to record the number of germinated detached roots 20, 30 and 50 days after treatment. To quantify revival of mechanically treated rhizomes undetached from root bases, further experiments were performed during the fallow season of 2005. Camelthorn was cut off from 4 different soil depth i.e. 0, 10, 20 and 30 cm at an infected field with natural distribution. Date of germination, plant height, canopy shading area, number of shoots and dry matter were recorded at 7, 10,17, 24, 34, 41 and 58 days after treatment (DAT). Various physiological indices including plant growth rate and germination rate were determined. The results revealed that roots with various length of detachment at the field differ significantly in ability to recover. However, no germination in all pot experiments Correspondence to : M.bazoobandi, bazubandi@yahoo.com M.Bazoobandi et al 85 was recorded. Soil depth for cutting off roots could make significant differences on plant growth characteristics. Final shoot height was significantly reduced by depth of cutting. Almost the same pattern was recorded in case of canopy shading area and single plant dry matter. In conclusion, the deeper plow depth the more suppressed plants are, and as a consequence, we have better camelthorn management.

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