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Microbial biomass and size-density factions differ between soils of organic and conventional agricultural systems

Fliessbach, Andreas and Mäder, Paul (2000) Microbial biomass and size-density factions differ between soils of organic and conventional agricultural systems. Soil Biology & Biochemistry, 32 (6), pp. 757-768.

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Summary

Agricultural production systems have to combine management practices in order to sustain soil quality and also pro®tability. We investigated microbial biomass and size-density fractions of soils from a long-term field trial set up in 1978 at Therwil, Switzerland. It compares the economic and ecological performance of organic and conventional agricultural systems. Main differences of the systems were the amount and form of fertiliser as well as the plant protection strategy, whilst crop rotation and soil tillage were the same. Microbial biomass C and N as well as their ratios to the total and light fraction C and N pools in soils of the organic systems were higher than in conventional systems. This is interpreted as an enhanced decomposition of the easily available light fraction pool of soil organic matter (SOM) with increasing amounts of microbial biomass. The role of microbial biomass as a regulator and light fraction organic matter as an indicator of decomposition is discussed. The presented results indicate that labile pools of SOM are distinctly affected by long-term management practices.


EPrint Type:Journal paper
Keywords:Anbautechnik Einjährige Kulturen, Bodenfruchtbarkeit, DOK
Subjects: Soil > Soil quality > Soil biology
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Sustainability > Climate Change
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil Sciences
Related Links:http://www.fibl.org, http://orgprints.org/perl/search/advanced?_fulltext_=&_fulltext__merge=ALL&addtitle%2Ftitle=&addtitle%2Ftitle_merge=ALL&authors=&authors_merge=ALL&editors=&editors_merge=ALL&abstract%2Fengabstract=&abstract%2Fengabstract_merge=ALL&keywords=DOK&keywords_me
Deposited By: Fliessbach, Dr. Andreas
ID Code:2474
Deposited On:29 Jun 2004
Last Modified:12 Apr 2010 07:29
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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