اثر رقابت گونه مهاجم سوروف (Echinochloa oryzicola (Ard) Fisher) در مزارع برنج گیلان

نوع مقاله : علمی - پژوهشی

نویسندگان

چکیده

سوروف (Echinochloa oryzicola (Ard) Fisher) گونه مهاجم در شالیزارهای کشور و دارای خواص تقلیدکنندگی از برنج می باشد. به منظور بررسی اثر رقابتی گونه مهاجم سوروف و ارزیابی میزان خسارت آن در مزارع برنج، آزمایشی به صورت طرح بلوک های کامل تصادفی در موسسه برنج کشور در رشت در سال زرعی 1387 انجام شد. فاکتور های آزمایشی شامل سه سطح تراکم (10، 20 و 40 بوته در متر مربع ) و برای برنج در تراکم رایج منطقه (20 کپه در متر مربع) می‌باشد. نتایج حاصل از داده های آزمایشی و مدل رگرسیونی دلالت بر این دارد که سوروف برنج باعث کاهش معنی دار عملکرد دانه، تعداد خوشه در بوته، عملکرد بیولوژیک و شاخص برداشت در سطح احتمال 1درصد گردید. با افزایش تراکم 40-0 بوته در متر مربع، کاهش عملکرد دانه تا 70 درصد را نشان داده است. میزان کاهش تعداد دانه در خوشه در تراکم های 10، 20 و 40 بوته در متر مربع به ترتیب 34، 41 و 43 درصد و میزان کاهش تعداد خوشه دربوته برنج در اثر تداخل با سوروف برنج به ترتیب 62، 64 و 62 درصد بود. تراکم های 10، 20 و 40 بوته در متر مربع بطور متوسط موجب 49، 67 و 61 درصد کاهش در تعداد پنجه برنج گردید. برنج، در تراکم 40 بوته سوروف برنج کمترین ارتفاع و در تیمار شاهد(بدون وجود علف هرز) بیشترین ارتفاع را دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of competition of early watergrass (Echinochloa oryzicola (Ard) Fisher) on rice fields of Guilan

نویسندگان [English]

  • M.J. Golmohammadi
  • H. Alizadeh
  • B. Yaghoubi
  • M. Nahvi
چکیده [English]

ٍEarly watergrass (Echinochloa oryzicola (Ard) Fisher) is an aggressive specie of Echinochloa and have mimicry chareterstics of rice . In order to evaluate competitive effect of aggressive specie of Echinochloa on Rice, an experiment was conducted at the Rice Research Institute of Rasht during 2007. The experimental design was complete randomized block with three replications. The treatment included weeds density at three densities (10, 20 and 40 plant/m2) and Rice was transplanted with local normal density (20 bunch.m-2 and each bunch included three plants). Result indicated that early water grass decreased grain yield, the number of panicle per plant, biologic yield and harvest index were significantly at possible area 1%. When density increased until 40 plant.m-2, grain yield lossed was 70%. Loss of number seed per panicle in densities 10, 20 and 40 plant/m2 was 34, 41 and 43 present and loss of number panicle per plant of rice in competition to Echinochloa was 62, 64 and 62 present respectively. Densities of 10, 20 and 40 plant.m-2 decreased average of rice height to 49, 67 and 61 present, respectively. Rice in densities 40 plant.m-2 of weed had less highest and in densities 0 plant.m-2 the highest.

کلیدواژه‌ها [English]

  • Competition
  • Density
  • Weed
  • Yield loss
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