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Microbiological community analysis of vermicompost tea and its influence on the growth of vegetables and cereals

Publication: Canadian Journal of Microbiology
19 June 2012

Abstract

Vermicompost, the digestion product of organic material by earthworms, has been widely reported to have a more positive effect on plant growth and plant health than conventional compost. A study was conducted to investigate the effects of different vermicompost elutriates (aerated compost teas) on soils and plant growth. The teas were analyzed by chemical, microbiological, and molecular methods accompanied by plant growth tests at laboratory and field scale. The number of microorganisms in the teas increased during the extraction process and was affected by substrate addition. The vermicompost tea found to increase plant growth best under laboratory tests was applied to cereals (wheat and barley) and vegetables (Raphanus sativus, Rucola selvatica, and Pisum sativum) in a field study. The results revealed no effects of tea application on plant yield; however, sensoric tests indicated an improvement in crop quality. The soils from laboratory and field studies were investigated to detect possible microbial or chemical changes. The results indicated that minor changes to the soil microbial community occurred following tea application by foliar spray in both the laboratory-scale and field-scale experiments.

Résumé

On rapporte que le vermicompost, le produit de la digestion de matériel organique par les vers de terre, exerce des effets positifs sur la croissance et la santé des végétaux supérieurs à ceux du compost conventionnel. Une étude a été réalisée afin d’examiner les effets de différents élutriats de vermicompost (thé de compost aéré) sur les sols et la croissance des végétaux. Les thés ont été analysés à l’aide de méthodes chimiques, microbiologiques et moléculaires, parallèlement à des tests de croissance des végétaux dans le laboratoire et sur le terrain. Le nombre de microorganismes des thés augmentait lors du processus d’extraction et était affecté par l’ajout de substrat. Le thé de vermicompost qui s’est avéré le plus efficace sur le plan de la croissance des végétaux en laboratoire a été appliqué sur des céréales (blé et orge) et des légumes (Raphanus sativus, Rucola selvatica, and Pisum sativum) lors de tests sur le terrain. Les résultats ont révélé que l’application de thé n’avait aucun effet sur le rendement des récoltes; cependant, les tests en sensorique ont indiqué une amélioration de la qualité des récoltes. Les sols étudiés en laboratoire et sur le terrain ont été examinés afin de détecter de possibles changements microbiologiques ou chimiques. Les résultats ont indiqué que des changements mineurs de la communauté microbienne des sols survenaient après une application de thé par vaporisation foliaire tant à l’échelle du laboratoire que sur le terrain.

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Information & Authors

Information

Published In

cover image Canadian Journal of Microbiology
Canadian Journal of Microbiology
Volume 58Number 7July 2012
Pages: 836 - 847

History

Received: 21 December 2011
Revision received: 20 March 2012
Accepted: 27 March 2012
Version of record online: 19 June 2012

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Key Words

  1. vermicompost tea
  2. composting
  3. plant growth
  4. microorganisms
  5. microbial community

Mots-clés

  1. thé de vermicompost
  2. compostage
  3. croissance végétale
  4. microorganisme
  5. communauté microbienne

Authors

Affiliations

J.I. Fritz
Universität für Bodenkultur Wien, Department IFA-Tulln, Konrad Lorenz Str. 20, 3430 Tulln, Austria.
I.H. Franke-Whittle
Universität Innsbruck, Institut für Mikrobiologie, Technikerstraße 25, 6020 Innsbruck, Austria.
S. Haindl
Universität für Bodenkultur Wien, Department IFA-Tulln, Konrad Lorenz Str. 20, 3430 Tulln, Austria.
H. Insam
Universität Innsbruck, Institut für Mikrobiologie, Technikerstraße 25, 6020 Innsbruck, Austria.
R. Braun
Universität für Bodenkultur Wien, Department IFA-Tulln, Konrad Lorenz Str. 20, 3430 Tulln, Austria.

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