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The turnover of soil organic matter on different farm types

Petersen, B.M. and Berntsen, J. (2003) The turnover of soil organic matter on different farm types. DARCOFenews (3).

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Online at: http://www.darcof.dk/enews/sep03/orgmat.html

Summary

One of the prime factors determining soil fertility is the content of soil organic matter. A huge amount of nitrogen (N) is bound in organic matter, and the yearly mineralisation of N in the field is only a small fraction of the total organic nitrogen.The release and incorporation of organic N is of special relevance for organic farms, where the crop supply mainly depends on N mineralised from organic matter.In order to study the long-term balance between build-up and degradation of organic matter, a simple simulation model was made, calibrated on the basis of long-term data from Sweden, U.K. and Denmark. Briefly, it is a 3-pool model (Figure 1) employing first-order kinetics, which is implemented in C-TOOL. The long-term build up or breakdown of organic N is assumed to follow carbon in the ratio 1:10.


EPrint Type:Journal paper
Subjects: Soil > Soil quality > Soil biology
Research affiliation: Denmark > DARCOF II (2000-2005) > I. 3 (BIOMOD) Interaction between nitrogen dynamics, crop production and biodiversity
Deposited By: Petersen, Researcher Bjorn Molt
ID Code:4665
Deposited On:30 Mar 2005
Last Modified:12 Apr 2010 07:30
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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