کاربرد علف‌کش در مزارع برنج تلقیح شده با ازتوباکتر کروکوکوم ‏ (‏Azotobacter chroococcum‏)‏

نوع مقاله: علمی پژوهشی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد زراعت، گروه زراعت و اصلاح نباتات، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران.‏

2 دانشیار، گروه زراعت و اصلاح نباتات، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران

3 دانشیار، گروه زراعت و اصلاح نباتات، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران. ‏

چکیده

به­منظور بررسی امکان کاربرد علف­کش در مزارع برنج (رقم بومی هاشمی) تلقیح شده با باکتری ازتوباکتر کروکوکوم، آزمایشی به­صورت فاکتوریل در قالب طرح بلوک­های کامل تصادفی با سه تکرار در رشت در سال 1393 انجام شد. فاکتورهای آزمایش شامل کاربرد باکتری ازتوباکتر کروکوکوم در دو سطح ( تلقیح و عدم تلقیح) و روش­های مختلف کنترل علف­های­هرز در شش سطح (کاربرد علف­کش پرتیلاکلر + یک­بار وجین تکمیلی، کاربرد علف­کش بن‌سولفورون‌متیل + یک­بار وجین تکمیلی، کاربرد مخلوط علف­کش پرتیلاکلر و بن‌سولفورون‌متیل + یک­بار وجین تکمیلی، وجین کامل+ عدم مصرف علف­کش، عدم وجین + عدم مصرف علف­کش) بودند. نتایج نشان داد کاربرد ازتوباکتر کروکوکوم سبب افزایش معنی­دار عملکرد شلتوک به میزان 16 درصد گردید. عدم کنترل علف­های­هرز نیز منجر به کاهش معنی­دار عملکرد شلتوک نسبت به تیمارهای وجین­دستی و شیمیایی شد. معنی­دار نبودن اثر متقابل بین عامل­های مورد بررسی بر عملکرد شلتوک و زیست­توده برنج نشان داد که کاربرد علف­کش­های مـورد بررسـی در این آزمـایش اثر بازدارندگی و یا تحریک­کنندگی بر فعالیت ازتوباکتر کروکوکوم در بهبود رشد و عملکرد شلتوک برنج نداشتند. وزن خشک علف­های هرز در تیمار وجین دستی، مصرف پرتیلاکلر، بن­سولفورون­متیل و مخلوط پرتیلاکلر، بن­سولفورون متیل در مقایسه با شاهد عدم وجین به­ترتیب به میزان 88، 91، 92 و 94 درصد کاهش یافت. کاربرد باکتری ازتوباکتر کروکوکوم اثر معنی­داری بر وزن خشک علف­های­هرز نداشت. به­طورکلی، نتایج این آزمایش نشان داد که امکان کنترل شیمیایی علف­های­هرز در مزارع برنج تلقیح شده با ازتوباکتر کروکوکوم وجود دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Application of Herbicide in Paddy Fields Inoculated with ‎Azotobacter chroococcum

نویسندگان [English]

  • Akbar Shirzad Chenari 1
  • Hashem Aminpanah 2
  • Peyman Sharifi 3
1 Graduated Student of Agronomy, Rasht Branch, Islamic Azad University, Rasht, Iran‏.‏‎ ‎
2 Associate professor, Department of Agronomy and Plant Breeding, Rasht Branch, Islamic Azad University, Rasht, Iran‏.‏
3 Associate professor, Department of Agronomy and Plant Breeding, Rasht Branch, Islamic Azad University, Rasht, Iran‏.‏
چکیده [English]

A field experiment was conducted at Rasht, in 2014, to investigate controlling weeds in native Hashemi cultivar paddy fields by different methods of herbicide applications and inoculated with Azotobacter chroococcum. The factorial experiment based on a randomized complete block design with three replicates was performed. Factors were Azotobacter application with two levels (inoculation with or without Azotobacter chroococcum) and weed management regimes with six levels (pretilachlor plus a supplementary hand weeding, bensulfuron methyl plus a supplementary hand weeding, and pretilachlor + bensulfuron methyl plus a supplementary hand weeding, hand weeding during rice growing period + no herbicide, un-weeded during rice growing period + no herbicide). Results indicated that paddy rice yield was significantly increased by 16% after Azotobacter chroococcum inoculation. Rice paddy yield was significantly reduced in un-weeded plots compared to hand weeded and herbicide treated plots. ANOVA also revealed that there was no interaction effect between Azotobacter chroococcum applications and weed management regimes on paddy and biological yields, indicating that the herbicides had no adverse effect on Azotobacter efficiency in promoting growth and paddy yield of rice. Weed dry weight was reduced by 88, 91, 92, and 94 percentages in weeded plot and plots treated with pretilachlor, bensulfuron methyl, and pretilachlor + bensulfuron methyl, respectively, compared to un-weeded plots. Azotobacter chroococcum inoculation had no significant effect on weed biomass. Overall, the result of this experiment confirmed the feasibility of chemical weed control in paddy fields inoculated with Azotobacter chroococcum.

کلیدواژه‌ها [English]

  • Bensulfuron methyl
  • plant growth-promoting rhizobacteria
  • Pretilachlor
  • Rice
  • Yield ‎loss
  • Weed.‎
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