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نوع مقاله : علوم علف‌های هرز

نویسندگان

1 دانشگاه علوم کشاورزی و منابع طبیعی خوزستان

2 هیت علمی دانشگاه تهران

3 هیات علمی دانشگاه تهران

4 هیات علمی دانشگاه شیراز

چکیده

آزمایشی به‌صورت کرت­های دوبار خردشده به منظور ارزیابی اثر دوزهای مختلف علف­کش یدوسولفورون+مزوسولفورون (آتلانتیس) و زمان کاربرد آنها بر دو توده فارس و کردستان یولاف در سال زراعی 1392-1393 در شرایط مزرعه در استان فارس انجام شد. دوزهای مختلف علف­کش (0، 6، 12، 18 و 24 گرم ماده مؤثره در هکتار) به‌عنوان کرت اصلی، دو توده یولاف­وحشی (توده جمع­آوری شده از فارس و توده جمع­آوری شده از کردستان) به‌عنوان کرت فرعی و زمان کاربرد علف کش مرحله 18 (هشت­برگی) و 23 زادوکس (مرحله پنجه­زنی) به‌عنوان کرت فرعی فرعی درنظر گرفته شد. درصد رشد مجدد در دو توده فارس و کردستان در بالاترین دوز (24گرم در هکتار) در دو زمان کاربرد علف­کش در هشت­برگی به‌ترتیب 6/16 و 5/ 4 درصد و پنجه­زنی 23 و 6 درصد به دست آمد. درصد رشد مجدد یولاف­وحشی در دوزهای کاهش یافته (12گرم در هکتار) در زمان پنجه­زنی نسبت به هشت­برگی در دو توده کردستان و فارس بیشتر بود. معادلات دوز- پاسخ نشان داد که دوز مورد نیاز برای کاهش 50 درصد وزن خشک یولاف­وحشی در توده کردستان در دو زمان کاربرد هشت­برگی و پنجه­زنی معادل 93/7 و 38/8 گرم ماده موثره در هکتار و در توده فارس در دو زمان هشت­برگی و پنجه­زنی به ترتیب برابر 89/9 و 66/9 گرم ماده مؤثره در هکتار بود. کاربرد دوز­های کاهش یافته (12 گرم ماده مؤثره در هکتار)، در مرحله 18 زادوکس (هشت برگی) توصیه می‌گردد.
 
 

کلیدواژه‌ها

عنوان مقاله [English]

The survey of phenomenon as regrowth of wild oat after application herbicide in two populations Fars and Kurdistan

نویسندگان [English]

  • ahmad zare 1
  • hamid rahimian mashhadi 2
  • mostafa oveisi 3
  • reza hamidi 4

1 Assistant Professor Agricultural science and Natural Resources University of Khuzestan

2 university of tehran

3 university of tehran

4 university of shiraz

چکیده [English]

A
To evaluate the different doses of mesosulfuron + iodosulfuron (Atlantis) and application time on two Kurdistan and Fars populations in crop year 2013-2014, a split spilt plot experiment was carried out in the field in Fars province. The different doses of herbicide (0, 6, 12, 18, 24 g ai/ha) as the main plot, two populations of wild oat (Kurdistan and Fars respectively) as sub-plot and application time at stages of 18 (8 leaves) and 23 zadoks (tillering) as sub-sub plot were considered. The regrowth percentage of wild oat Fars and Kurdistan populations in highest dose (24 g ai/ha) at two herbicide application times in 8 leaves (16.16 and 4.5%) and tillernig (23 and 6%) were obtained respectively. It is remarkable that the regrowth percentage of wild oat at reduced dosage (12 g ai/ha) at tillernig time was more than 8 leaves in two Kurdistan and Fars populations. Dose-response equations for dry weight of wild oat showed that the required level of dose for reaching a 50% decrease in two populations of wild oat and application times was different. Doses of 7.93 and 8.38 g ai/ha in order to achieve a 50% decrease in the dry weight of Kurdistan population in two application times of 8 leaves and tillering was required. These amounts for a 50% reduction in dry weight of Fars were 9.89 and 9.66 g ai/ha, respectively. In reduced doses of herbicide with delayed application time, regrowth and dry weight of wild oat increase and effect on grain yield and number of spike in wheat. The application of reduced doses (12 g ai/ha) is recommended at stages of 18 zadoks (8 leaves).

کلیدواژه‌ها [English]

  • Dose-response
  • reduced dosesDose-response
  • Dry weight
  • Herbicide efficiency
  • Grain yield
  • Reduced doses
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