اثر تراکم گیاهی و مصرف مقادیر کاهش‎یافته دو علف‎کش پس رویشی بر زیست توده علف های هرز پهن برگ و عملکرد و اجزای عملکرد سورگوم جارویی در منطقه میانه

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد رشته شناسایی و مبارزه با علف‌های هرز، دانشگاه آزاد اسلامی واحد تاکستان، نویسنده مسئول

2 دانشیار پژوهش مؤسسه تحقیقات اصلاح و تهیه نهال و بذر کرج

3 دانشیار مؤسسه تحقیقات گیاهپزشکی کشور

4 استادیار گروه گیاهپزشکی دانشگاه آزاد اسلامی واحد میانه

چکیده

به منظور بررسی اثر تراکم گیاهی و مصرف دو علف‎کش­ پس­رویشی بر عملکرد جارو در سورگوم جارویی، آزمایشی در سال 1390 به صورت فاکتوریل در قالب طرح بلوک­های کامل تصادفی با سه تکرار در منطقه میانه اجرا شد. تیمارهای آزمایش شامل تراکم کشت سورگوم جارویی در سه سطح 17، 24 و 31 بوته در متر مربع و مصرف دو تیمار علف‎کش توفوردی+ ام­سی­پی­آ و بروموکسینیل + ام­سی­پی­آ در دز توصیه شده ( 5/1 لیتر درهکتار )، 20 درصد دز کاهش یافته (2/1 لیتر در هکتار) و 40 درصد دز کاهش یافته (9/0 لیتر در هکتار) بودند. برای هر تراکم یک شاهد وجین نیز در نظر گرفته شد. نتایج نشان داد که زیست توده علف­های هرز با افزایش تراکم گیاه کاهش یافت و دز توصیه شده بروموکسینیل + ام­سی­پی­آ در اکثر مراحل نمونه‎برداری مؤثرترین تیمار علف‎کشی بود. هم‎چنین، با افزایش تراکم کاشت، تعداد و وزن خشک برگ، وزن خشک ساقه و خوشه در سورگوم جارویی افزایش پیدا کرد. عملکرد جارو و تلاش زادآوری با افزایش تراکم به طور قابل توجهی افزایش یافت. بیشترین افزایش در عملکرد جارو از کاربرد بروموکسینیل+ ام­سی­پی­آ و توفوردی + ام­سی­پی­آ در دز توصیه شده به دست آمد. اثر دز توصیه شده و دز 20 درصد کاهش یافته بروموکسینیل+ ام­سی­پی­آ بر بهبود عملکرد جارو از لحاظ آماری مشابه بود. با توجه به نتایج به دست آمده، برای مهار علف­های هرز و بهبود عملکرد جارو در منطقه، تراکم کاشت 31 بوته در متر مربع و مصرف علف‎کش بروموکسینیل ­+ ام­سی­پی­آ با 20 درصد دز کاهش یافته توصیه می­شود. 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of crop density and application of reduced dosages of two post-emergence herbicides on broadleaf weeds biomass and yield and yield components of broomcorn (Sorghum vulgare var. technicum)

نویسندگان [English]

  • Hamed Raeisi 1
  • Jahanfar Daneshian 2
  • Mohammad Ali Baghestani 3
  • Soleiman Jamshidi 4
1 M.Sc. Student, Takestan Branch, Islamic Azad University, Takestan, Iran.
2 Associate prof., Seed and Plant Improvement Institute, Karaj, Iran.
3 Associate prof., Iranian Research Institute of Plant Protection.
4 Faculty Member of Miyaneh Branch, Islamic Azad University, Miyaneh, Iran.
چکیده [English]

To evaluate the effect of crop density and application of reduced dosage of two post­-emergence herbicides on broom yield of broomcorn, an experiment was carried out in 2011 as factorial based on a randomized complete block design with three replications in Miyaneh region. Treatments were crop densities of 17, 24 and 31 plant. m-2 and herbicides including 2,4-D­+­MCPA and bromoxynil­+­MCPA with recommended, 20% and 40% reduced dosages. For each crop density, a hand weeding plot were considered as control. Results showed that weed biomass was decreased with crop density increasing, and recommended dosage of bromoxynil +­ MCPA was the most effective herbicide treatments in most sampling stages. Also, increasing crop density resulted in increased leaf number and leaf, stalk and panicle dry weight. Besides, broom yield and production efforts were significantly increased with increasing plant density. The highest broom yield was obtained with application of bromoxynil­ + ­MCPA and 2,4-D­ + ­MCPA in recommended dosages. The effect of recommended and 20% decreased dosages of bromoxynil ­+ ­MCPA was similar on broom yield improvement. Regarding to the obtained results, plantin density of 31 plant.m-2 and 20% of recommended dosage of bromoxynil­ +­ MCPA application is recommended to weed control and broomcorn yield increment in Miyaneh region.

کلیدواژه‌ها [English]

  • Integrated weed management
  • Plant density
  • broomcorn
  • herbicide
  • broom yield
Azari-Nasrabad A, Ramazani SHR (2009) Investigation of plant density effects on grainyield and its components in grain sorghum(Sorghum bicolor L.)in Birjand.Electronic Journal of CropProduction 2(3): 107-118. [In Persian with English Abstract].

Baghestani MA (2010) Spectrum herbicide applied in corn fields. Final Report of the Research Project. Ministry of Agriculture. Agriculture, education and Research Organization 33 pp. [In Persian with English Abstract].

Baghestani MA, Zand E, Sofizadeh S, Mirvakili M, Jaafarzadeh, N (2007) Response of winter wheat (Triticum aestivum L.) and weeds to tank mixtures of 2,4-D plus MCPA with clodinafop propargyl. Weed BiologyandManagement 7: 209-218.

Emam Y (2003) Cereal grain crops. Shiraz University Press. pp. 133-142. [In Persian with English Abstract].

Fouman A (2010) Sorghum breeding and production. Agricultural Education Press. 129 pp.

Greichar WJ, Besler BA, Brewer KD (2005) Weed control and grain sorghum (Sorghum bicolor) response to postemergence applications of atrazine, pendimethalin and trifluralin. Weed Technology 19: 999-1003.

Grichar WJ, Brent BA, Brewer, KD (2004)Effect of row spacing and herbicide dose on weed control and grain sorghum yield. Crop Protection 23: 263-276.

Hani Z, Ghosheh, D, James M (1996) Influence of Sorghum halepens interference in field corn. Weed Science 44: 879-883.

Ishaya DB, Dadari SA, Shebayan JAY (2007) Evaluation of herbicides for weed control in sorghum (Sorghum bicolour) in Nigeria. Crop Protection 26: 1697-1701.

Jamshidi S (2003) Identification and distribution of smuts on broomcorn in Miyaneh and Zanjan regions. Final Report of Research Project. Islamic Azad University, Miyaneh Branch. 164 pp.

Javadi H, Rashed Mohssel MH, Azari Nasrabad A (2007) Effect of plant density on agronomic characteristics, chlorophyll content and stem remobilization percentage in four grain sorghum (Sorghum bicolor (L.) Moench) varieties. Journal of Agricultural Research 5(2): 271-279. [In Persian with English Abstract].

Joseph P,Yenish A, Douglas W, York AC (1996) Cover crops for herbicide replacement in no-tillage corn (Zea mays). Weed Technology 10: 815-821.

Latif Bayat M, Nassiri Mahallati M, Rezvani Moghaddam P, Rashed Mohassel MH (2009)  Effect of crop density and reduced doses of 2,4–D + MCPA on control of redroot pigweed (Amaranthus retroflexus L.)in corn(Zea mays L.). Journal of Agricultural Research 7 (1): 11-22.

Lotfi Mavi F, Daneshian J, Baghestani MA (2012) Integrated weed Management in broomcorn (Sorghum bicolor) farms in Miyaneh region. Journal of Agricultural and Sustainable Production 22(1): 55- 69. (In Persian with English Abstract)

Lotfi Mavi F, Daneshian J, Baghestani MA, Faramarzi A, Shayestehnia AR (2011) Effect of integrated weed management on yield and yield components of broomcorn (Sorghum vulgare L.). Iranian Journal of Crop Sciences 13(4): 596-610. [In Persian with English Abstract].

Montazeri, R, Zand E, Baghestani MA (2005) Weeds and their control in wheat fields in Iran. Pest and Diseases Research Institute, 85 pp. [In Persian with English Abstract].

Pezeshki A, Baghesani MA, Jamshidi S (2010) Broomcorn’s weed chemical control using some conventional herbicides. Journal of Moden Sustainable Agricultural Science 20: 1-12. [In Persian with English Abstract].

Robles E (2005) Broadleaf weed management in grain sorghum with reduced rates of postemergence herbicides. Weed Technology 19: 385-390.

Nemati S, Shahrokhi S, Lotfi Mavi F, Mehrpouian M (2011) Effect of herbicides on weed control and mechanical management in broomcorn Miyaneh region. Second National Conference on Sustainable Agriculture and Rural Development (Opportunities and Challenges), Islamic azad University of Shiraz. [In Persian with English Abstract].

Shahrokhi S (2005) Survey on biological characteristics and population dynamics of broomcorn’s aphids. Final Report of Research Project, Islamic Azad University, Miyaneh Branch. 56 pp. [In Persian with English Abstract].

Teasdale JR (1995) Influence of narrow row/high population corn (Zea mays) on weed control and light transmittence. Weed Technology 9: 113-118.

Zand E, Baghestani MA (2002) Weed resistance to herbicides. Mashhad University, Jahad Daneshgahi Press. 176 pp. [In Persian with English Abstract].