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Stabilization and plant uptake of N from 15N-labelled pea residue 16.5 years after incorporation in soil

Laberge, Guillaume; Ambus, Per; Nielsen, Henrik Hauggaard and Jensen, Erik Steen (2006) Stabilization and plant uptake of N from 15N-labelled pea residue 16.5 years after incorporation in soil. Soil Biology and Biochemistry, 38 (7), pp. 1998-2000.

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Document available online at: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TC7-4J72XYG-3&_user=641886&_coverDate=07%2F31%2F2006&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000034458&_version=1&_urlVersion=0&_userid=641886&md5=a3917b558d511117fab4c711fc78537e


The decline of N from 15N-labelled mature pea residues was followed in unplanted soil over 16.5 yr. Eight years after residue incorporation, 24% of the residue 15N input was still present in the soil and, after 16.5 yr, 16% of the residue 15N input remained. A double exponential model successfully described the decay of N from 15N-labelled pea residues. The total residual 15N declined with average decay constants of 1.45 yr−1 for the 30 d to 1 yr period and of 0.07 yr−1 for the 1–16 yr period. Sixteen years following incorporation of the residues, indicator plants growing in residues-amended soils were obtaining 1.7% of their N from residue N. This is, to our knowledge, the longest study on decay of N in soils from 15N-labelled crop residues. The current study thus provides a unique data set for our empirical understanding of N-dynamics in agricultural systems, which is a prerequisite to parameterize and validate N-simulation models.

EPrint Type:Journal paper
Keywords:15N-labelled crop residue; Soil nitrogen; Residue decomposition; Nitrogen uptake; Double exponential decay; Pisum sativum
Subjects: Soil > Nutrient turnover
Research affiliation: Denmark > KU - University of Copenhagen
Denmark > SOAR - Research School for Organic Agriculture and Food Systems
Related Links:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TC7-4J72XYG-3&_user=641886&_coverDate=07%2F31%2F2006&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000034458&_version=1&_urlVersion=0&_userid=641886&md5=a3917b558d511117fab4c711fc78537e
Deposited By: Laberge, Mr. Guillaume
ID Code:11213
Deposited On:18 Oct 2007
Last Modified:12 Apr 2010 07:35
Document Language:English
Refereed:Peer-reviewed and accepted

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