بررسی رویش گیاهچه‌‌های یولاف وحشی بعد از کاربرد علف‌‌کش در مزارع گندم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تهران

2 دانشگاه شیراز

چکیده

علف‌های‌هرز زمستانه دارای موج سبز شدن متفاوتی در مزرعه ‌‌می‌باشند و دانستن این سوال که آیا بعد از کاربرد علف‌‌کش فلش جوانه زنی وجود دارد، ‌‌می‌تواند در انتخاب زمان دقیق کنترل موثر باشد. از این رو الگوی رویش علف‌‌هرز یولاف وحشی به مدت سه سال از 1390 تا 1393 در مزارع غلات استان فارس مورد بررسی قرار گرفت. نتایج الگوی رویش تجمعی یولاف وحشی در سال زراعی 1390-1391 نشان داد که در 115درجه-روز رشد 50 درصد بذور سبز شدند. درصد سبز شدن نشان داد که 09/21 درصد بذور در 25/99 درجه-روز رشد، 45 درصد بذور در 75/136 درجه-روز رشد ، 37/19 درصد بذور در 180 درجه-روز رشد و 43/2 درصد بذور نیز در 220 درجه-روز رشد سبز شدند. الگوی رویش در سال زراعی 1391-1392 نشان داد که برای رسیدن به 50 درصد سبز شدن نیاز به 127 درجه-روز رشد بود و در سال زراعی 1392-1393 50 درصد بذور در 146 درجه–روز رشد سبز شدند. در کل نتایج تحقیق نشان داد که با توجه به آلودگی و حضور یولاف وحشی در مزرعه حتی با کاربرد علف‌‌کش فرضیه فلش‌‌های مختلف بعد از کاربرد علف‌‌کش رد ‌‌می‌گردد و تمامی بذور موجود در بانک بذر خاک در یک ماه اول پس از کاشت رویش داشته اند.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of Wild Oat Seedling Emergence after Herbicide Application in Wheat

چکیده [English]

Winter weeds have different emergence flashes in field and response to this question whether there is flash emergence after applying herbicide, can be effective in the selection of right time for weed control. Therefore, emergence pattern of the wild oat seedlings was studied for three years from 2011 to 2014 in cereal fields of Fars province. The cumulative emergence pattern of wild oat during 2011-2012 showed that 50% of emergence occurred at growing degree days (GDD) of 115. The emergence percent revealed that 21.09, 45.00, 19.37 and 2.43% seeds respectively at GDD of 99.25, 136.75, 180 and 220 were emergence. The emergence pattern in 2012-2013 crop years also showed that a GDD of 127 was required for 50% emergence. This amount for 2013-2014 crop years was 146 GDD. With regard to the contamination and presence of wild oats in the fields, final results of this study showed that the hypothesis of various flashes after the herbicide application is rejected. All the weed seedlings emerge in in fields during the first month after planting.

کلیدواژه‌ها [English]

  • Winter weeds
  • Emergence
  • herbicide
  • GDD
  • seed bank

مراجع

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