غنی سازی ورمی کمپوست با برخی باکتری های حل کننده فسفات و تثبیت کننده نیتروژن

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده کشاورزی دانشگاه تهران

چکیده

          تغییر جمعیت میکروارگانیسم ها در ورمی کمپوست در جهت بهبود کیفیت آن  یکی از موضوعات مطالعات جدید در زمینه تولید کودهای زیستی می باشد. تحقیق حاضر نیز با هدف امکان تغییر در مقادیر نیتروژن و فسفر در ورمی کمپوست و تعیین برخی از ویژگی های کیفی ورمی کمپوست انجام گرفته است. به منظور انجام این هدف پس از تولید ورمی کمپوست، زادمایه هایی از باکتری های جنس سودوموناس و ازتوباکتر تهیه شد و بعد از تلقیح باکتری ها به بستر ورمی کمپوست به مدت 60 روز در دمای 28 درجه سلسیوس نگهداری و در روزهای 0 ،20، 40 و 60 فاکتورهای بیولوژیکی و شیمیایی ورمی کمپوست اندازه گیری شد. نتایج نشان داد با افزایش طول زمان انکوباسیون جمعیت باکتری ها، مقادیر نیتروژن، فسفر قابل جذب، اسید هیومیک و خاکستر افزایش و مقدار کربن آلی، EC و pH کاهش یافت. طی انکوباسیون تیمارهای ازتوباکتر و سودوموناس به ترتیب افزایش حدود 80 و 20 درصدی نیتروژن و 25 و 40درصدی فسفر قابل جذب را داشتند. طبق نتایج به دست آمده از این تحقیق انکوباسیون به مدت 45 الی 60 روز می تواند نتایج بسیار مثبتی بر روی خصوصیات شیمیایی و بیولوژیکی ورمی کمپوست داشته باشد ولی سودمندی ناشی از انکوباسیون در مدت کمتر از 40 روز و بیشتر از 60 روز قابل ملاحظه نیست. باکتری های مورد استفاده در این تحقیق دارای تاثیرات مفید و متفاوتی بودند و بسته به نیاز می توان از این باکتری ها برای غنی سازی ورمی کمپوست بهره گرفت.

کلیدواژه‌ها

عنوان مقاله [English]

Enriching Vermicompost by Nitrogen Fixing and Phosphate Solubilizing Bacteria

نویسندگان [English]

  • A Hemati
  • HA Alikhani
  • AA Pourbabaee
  • G Bagheri Marandi
چکیده [English]

Changes in populations of microorganisms in the vermicompost in order to improving its quality has been the novel study topics in the field of organic fertilizer production. Present study was performed with aimed to possibility of changing in the content of nitrogen and phosphorus in the vermicompost and to determine some quality characteristics in vermicompost. In order to accomplish this goal, after the production of vermicompost, inoculums from Pseudomonas and Azotobacter bacteria genera were prepared, then bacteria inoculated to vermicompost beds, for 60 days at a temperature of 28 ° C storage, and biological and chemical factors were measured on days 0, 20, 40 and 60 in vermicompost. Results showed that with increasing incubation time, the population of bacteria, nitrogen, available phosphorus, ash and humic acid increased, and the amount of organic carbon, EC and pH decreased. During incubation, Azotobacter and Pseudomonas treatments increased N content about 80 and 20 percent and P content about 25 and 40 percent, respectively. According to results of this study, 45 to 60 day incubation period could have very good results on the chemical and biological properties in vermicompost, but this effect is not significant in less than 40 days and more than 60 days. Bacteria which used in the present study had beneficial and different effects and depending the requirement could be used for vermicompost enrichment.

کلیدواژه‌ها [English]

  • Azotobacter chroococcum
  • Humic acid
  • Pseudomonas fluorescens
  • Vermicompost

مراجع

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