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Turnover of grain legume N rhizodeposits and effect of rhizodeposition on the turnover of crop residues

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Authors:
  • Mayer, J. ;
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    unknown
  • Buegger, F. ;
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    unknown
  • Jensen, E.S. ;
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    Risø National Laboratory for Sustainable Energy, Technical University of Denmark
  • Schloter, M. ;
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    unknown
  • Hess, J.
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    unknown
DOI:
10.1007/s00374-003-0694-2
Abstract:
The turnover of N derived from rhizodeposition of faba bean (Vicia faba L.), pea (Pisum sativum L.) and white lupin (Lupinus albus L.) and the effects of the rhizodeposition on the subsequent C and N turnover of its crop residues were investigated in an incubation experiment (168 days, 15 degreesC). A sandy loam soil for the experiment was either stored at 6 degreesC or planted with the respective grain legume in pots. Legumes were in situ N-15 stem labelled during growth and visible roots were removed at maturity. The remaining plant-derived N in soil was defined as N rhizodeposition. In the experiment the turnover of C and N was compared in soils with and without previous growth of three legumes and with and without incorporation of crop residues. After 168 days, 21% (lupin), 26% (faba bean) and 27% (pea) of rhizodeposition N was mineralised in the treatments without crop residues. A smaller amount of 15-17% was present as microbial biomass and between 30 and 55% of mineralised rhizodeposition N was present as microbial residue pool, which consists of microbial exoenzymes, mucous substances and dead microbial biomass. The effect of rhizodeposition on the C and N turnover of crop residues was inconsistent. Rhizodeposition increased the crop residue C mineralisation only in the lupin treatment; a similar pattern was found for microbial C, whereas the microbial N was increased by rhizodeposition in all treatments. The recovery of residual N-15 in the microbial and mineral N pool was similar between the treatments containing only labelled crop residues and labelled crop residues + labelled rhizodeposits. This indicates a similar decomposability of both rhizodeposition N and crop residue N and may be attributable to an immobilisation of both N sources (rhizodeposits and crop residues) as microbial residues and a subsequent remineralisation mainly from this pool.
Type:
Journal article
Language:
English
Published in:
Biology and Fertility of Soils, 2004, Vol 39, Issue 3, p. 153-164
Keywords:
8-B gen; 15N, C and N mineralisation; Microbial residues; Microbial biomass; Residue turnover; Rhizodeposition
Main Research Area:
Science/technology
Submission year:
2004
ID:
5038396

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