Fertilizer Management Using Plant Growth-Promoting Rhizobacteria in Rice Fields
محورهای موضوعی : Farm Management
هاشم امین پناه
1
(دانشیار، گروه زراعت و اصلاح نباتات، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران)
سعید فیروزی
2
(دانشیار، گروه زراعت و اصلاح نباتات، واحد رشت، دانشگاه آزاد اسلامی، رشت، ایران)
کلید واژه: nitrogen, Rice, <i>Azotobacter chroococcum</i>, <i>Azospirillum lipoferum</i>,
چکیده مقاله :
A field experiment was conducted at Rice Research Station of Tonekabon, Iran, to determine the effect of seed inoculation with plant growth-promotingrhizobacteria on rice grain yield and yield components under different nitrogen (N) rates. The experimental design was a Randomized Complete Block with factorial arrangement and three replicates. Factors included seed inoculation with plant growth-promoting rhizobacteria [control (un-inoculated), seed inoculation with Azospirillum lipoferum, seed inoculation with Azotobacter chroococcum, and seed inoculation with a combination of A. lipoferumand A. chroococcum] and N rates (100%, 75%, and 50% of recommended nitrogen rates, i.e. 100, 75 and 50 kg N ha-1, respectively). Results showed that the highest grain yield (7875 kg ha-1) was recorded for plants inoculated with a combination of A. lipoferumand A. chroococcum, while the lowest one was recorded for un-inoculated control plants. Moreover, rice grain yield, panicle number per m2, grain number per panicle, and 1000-grain weight increased by 9%, 9%, 18%, and 6%, respectively, as N fertilizer rate increased from 50 to 100 kg ha-1. The highest grain yield (7875 kg ha-1) was obtained when N was applied at the rate of 75 kg ha-1to seeds inoculated with a combination of A. lipoferumand A. chroococcum.
این آزمایش مزرعهای در ایستگاه تحقیقات برنج تنکابن، ایران، به منظور بررسی اثر کاربرد باکتریهای محرک رشد گیاه بصورت بذرمال بر رشد و عملکرد برنج در سطوح متفاوت کود شیمیایی نیتروژن انجام شد. این آزمایش به صورت فاکتوریل دو عاملی و در قالب طرح پایه بلوکهای کامل تصادفی با سه تکرار انجام شد. فاکتورهای مورد بررسی شامل کاربرد باکتریهای محرک رشد گیاه (ازتوباکتر کروکوکوم، آزوسپریلوم لیپوفروم، کاربرد توام ازتوباکتر کروکوکوم و آزوسپریلوم لیپوفروم و عدم کاربرد باکتریهای محرک رشد گیاه) و مقدار کود نیتروژن (50، 75 و 100 درصد مقدار کود شیمیایی نیتروژن توصیه شده، به ترتیب برابر 50 ، 75 و 100کیلوگرم نیتروژن در هکتار) بودند. نتایج نشان داد که حداکثر مقدار عملکرد شلتوک (7875 کیلوگرم در هکتار) در پلاتهای تیمار شده با کاربرد توام باکتری ازتوباکتر کروکوکوم و آزوسپریلوم لیپوفروم مشاهده شد، در حالیکه حداقل عملکرد شلتوک در تیمار شاهد عدم مصرف باکتری مشاهده شد. همچنین نتایج نشان داد که با افزایش مصرف نیتروژن از 50 به 100 کیلوگرم در هکتار، عملکرد دانه، تعداد خوشه در متر مربع، تعداد پر در خوشه و وزن هزار دانه به ترتیب 9، 9، 18 و 6 درصد افزایش یافت. حداکثر عملکرد (7875 کیلوگرم در هکتار) با مصرف نیتروژن به میزان 75 کیلوگرم در هکتار و کاربرد توام باکتری ازتوباکتر کروکوکوم و آزوسپریلوم لیپوفروم مشاهده شد.
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