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Nutrient turnover and losses during composting of farmyard manure. Results of outdoor experiments over 11 years

Raupp, Joachim and Oltmanns, Meike (2005) Nutrient turnover and losses during composting of farmyard manure. Results of outdoor experiments over 11 years. Paper at: Researching Sustainable Systems - International Scientific Conference on Organic Agriculture, Adelaide, Australia, September 21-23, 2005. [Unpublished]

[thumbnail of Raupp_Oltmanns_2005_nutrient_turnover.doc] Source file - German/Deutsch


This paper tries to quantify losses of dry matter and nutrients and to look for parameters relevant to the risk of losses. We used data from 14 outdoor experiments carried out in 11 years with cattle manure. Nitrogen (N) rich manures seem to be predestined to have high dry matter and N losses during com-posting. In cases of high temperatures in the thermophilic stage we also observed also high dry matter losses, but not necessaryly high N losses. This may be a hint that an intensive decomposition of or-ganic matter is combined with a strong heat development. However, temperature level was independ-ent from the original N content. K losses were not correlated with any of the investigated parameters, not even with water content. Composted manure was about 60% of the original dry matter (calculated by increase of ash content). However, nutrient losses were much lower. Compared to the original con-tents, approx. 33% N and 39 or 17% K (based on ash contents) have been lost during the entire period of up to 223 days.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Heap, nitrogen, potassium, covering, phosphorus, ammonia, nitrate, temperature, ash content
Subjects: Environmental aspects > Air and water emissions
Crop husbandry > Composting and manuring
Research affiliation: Germany > Institute for Biodynamic Research - IBDF > Crop Growth and Yield
International Conferences > 2005: 1st ISOFAR Conference > 2005: 1st ISOFAR Conference
Related Links:http://orgprints.org/4013/, http://www.isofar.org/adelaide2005, http://orgprints.org/view/projects/int-conf-isofar-2005.html
Deposited By: ISOFAR
ID Code:4469
Deposited On:11 May 2006
Last Modified:12 Apr 2010 07:30
Document Language:English
Refereed:Peer-reviewed and accepted
Additional Publishing Information:The paper presented here is the final paper submitted by the authors to the conference Researching Sustainable Systems.
The final edited papers are available with the following publication:
Köpke, Ulrich; Niggli, Urs; Neuhoff, Daniel; Cornish, Peter; Lockeretz, Willie und Willer, Helga, (Hrsg.) (2005) Researching Sustainable Systems. Proceedings of the First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), Held in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the National Association for Sustainable Agriculture, Australia (NASAA), 21 – 23 September 2005, Adelaide Convention Centre, Adelaide, South Australia.. Research Institute of Organic Agriculture FiBL, CH-Frick, and International Society of Organic Agriculture Research (ISOFAR), c/o Institute of Organic Agriculture (IOL), DE-University of Bonn. http://orgprints.org/4013/
Distribution: Paper copies may be ordered from FiBL at a cost of 28 Euros plus mailing costs (see FiBL shop at http://www.fibl.org/shop); FiBL order number 1394. A PDF version is available free of charge for ISOFAR members via the member area of www.isofar.org.

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