Effect of organic and inorganic additives on some chemical properties of vermicompost, earthworm’s biomass and reproduction

Document Type: Full Article


Department of Soil Science, College of Agriculture, Shiraz University, Shiraz, I.R. Iran


ABSTRACT-The enrichment of bedding for vermicomposting systems with organic and inorganic additives is a technique which can promote the quality of produced vermicompost. Phosphate rock and fishmeal are two available and low-cost substances which can be provided easily and inoculation of vermicompost with phosphate solubilizing microorganisms (PSMs) can enhance the availability of their nutrients. In this research, the effect of using phosphate solubilizing bacteria (PSB) (Pseudomonas fluorescens) by adding phosphate rock (0 and 1% W/W) and fishmeal (0 and 1% W/W) on some chemical and biological properties of vermicompost was studied under greenhouse conditions with a factorial arrangement in a completely randomized design with three replications. Phosphate rock application and PSM inoculation decreased N concentration while fishmeal increased it. P concentration increased by adding phosphate rock, fishmeal or PSB or their co-applications. Fishmeal increased micro-nutrients concentration except for Fe. Phosphate rock increased Fe concentration and decreased other micro-nutrients concentration. Electrical conductivity (EC) increased by adding phosphate rock but decreased by fishmeal application. Phosphate rock and fishmeal increased pH. Phosphate rock and PSB decreased the number and weight of earthworms and the number of cocoons. Fishmeal application increased the number and weight of earthworms and number of cocoons. Results indicated that enrichment of vermicompost bedding by additives could increase some essential nutrients and change the growth and biomass of earthworms.


Article Title [Persian]

تاثیر افزودنی‌های آلی و معدنی بر برخی خصوصیات شیمیایی ورمی‌کمپوست، زیست توده و تولید مثل کرم‌های خاکی

Authors [Persian]

  • آناهیتا خسروی
  • مهدی زارعی
گروه علوم خاک، دانشکده کشاورزی،دانشگاه شیراز، شیراز، ج. ا. ایران
Abstract [Persian]

چکیده-غنی سازی بستر در سیستم تولیدی ورمی کمپوست با افزودنی های آلی و معدنی می تواند کیفیت ورمی کمپوست تولیدی را افزایش دهد. خاک فسفات و پودر ماهی مواد ارزان و قابل دسترس هستند و  مایه زنی  بستر با ریزجانداران حل کننده فسفات می تواند قایلیت استفاده عناصر غذایی آنها را افزایش دهد. به منظور بررسی تاثیر غنی سازی بستر تولید ورمی کمپوست با خاک فسفات، پودر ماهی و باکتری حل کننده فسفات، آزمایش فاکتوریل در غالب طرح کاملا تصادفی با سه تکرار انجام گردید. عوامل آزمایش شامل دو سطح باکتری حل کننده فسفات (سودوموناس فلورسنس) (بدون مایه زنی و مایه زنی شده)، دو سطح خاک فسفات (صفر و 1 % وزنی) و دو سطح پودر ماهی (صفر و 1% وزنی) بود. نتایج نشان داد که کاربرد خاک فسفات و باکتری موجب کاهش غلظت نیتروژن گردید در حالی که کاربرد پودر ماهی غلظت نیتروژن را در ورمی­کمپوست افزایش داد. کاربرد خاک فسفات، پودر ماهی و باکتری به تنهایی و همزمان سبب افزایش غلظت فسفر شد. کاربرد پودر ماهی موجب افزایش غلظت مس، روی و منگنز شد. خاک فسفات موجب افزایش غلظت آهن و همچنین کاهش مس، روی و منگنز شد. کاربرد خاک فسفات موجب افزایش قابلیت هدایت الکتریکی و کاربرد پودر ماهی موجب کاهش آن شد. به علاوه خاک فسفات و پودر ماهی هردو موجب افزایش پ هاش شدند. از طرف دیگر کاربرد خاک فسفات و باکتری حل کننده فسفات موجب کاهش تعداد و وزن کرم­های خاکی بالغ و همچنین تعداد کوکون گردید. کاربرد پودر ماهی تعداد و وزن کرم و تعداد کوکون را افزایش داد. نتایج نشان داده است که افزودن مواد به بستر قابلیت دسترسی  برخی عناصر غذایی را افزایش و رشد و زیست توده کرمهای خاکی را تغییر داده است.

Keywords [Persian]

  • واژه‏های کلیدی:
  • کوکون
  • پودر ماهی
  • باکتری حل کننده فسفات
  • خاک فسفات
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