eprintid: 6377
rev_number: 10
eprint_status: archive
userid: 19
dir: disk0/00/00/63/77
datestamp: 2013-01-07 09:20:44
lastmod: 2014-02-07 05:32:09
status_changed: 2013-01-07 09:20:44
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@CGIAR.ORG
creators_name: Probert, M E
creators_name: Delve, R J
creators_name: Kimani, S K
creators_name: Dimes, J P
icrisatcreators_name: Dimes, J P
affiliation: Queensland Bioscience Precinct(Brisbane)
affiliation: Tropical Soil Biology and Fertility Institute of International Centre for Tropical Agriculture(Kampala)
affiliation: ICRISAT(Bulawayo)
country: Australia
country: Uganda
country: Zimbabwe
title: Modelling nitrogen mineralization from manures: representing quality aspects by varying C:N ratio of sub-pools
ispublished: pub
subjects: s2.11
full_text_status: restricted
keywords: Decomposition; N mineralization; Quality factors; Simulation; ModellingDecomposition; N mineralization; Quality factors; Simulation; Modelling
abstract: The mineralization/immobilization of nitrogen when organic sources are added to soil is represented in many simulation models as the outcome of decomposition of the added material and synthesis of soil organic matter. These models are able to capture the pattern of N release that is attributable to the N concentration of plant materials, or more generally the C:N ratio of the organic input. However, the models are unable to simulate the more complex pattern of N release that has been observed for some animal manures, notably materials that exhibit initial immobilization of N even when the C:N of the material suggests it should mineralize N. The APSIM SoilN module was modified so that the three pools that constitute added organic matter could be specified in terms of both the fraction of carbon in each pool and also their C:N ratios (previously it has been assumed that all pools have the same C:N ratio). It is shown that the revised model is better able to simulate the general patterns on N mineralized that has been reported for various organic sources. By associating the model parameters with measured properties (the pool that decomposes most rapidly equates with water-soluble C and N; the pool that decomposes slowest equates with lignin-C) the model performed better than the unmodified model in simulating the N mineralization from a range of feeds and faecal materials measured in an incubation experiment
date: 2005
date_type: published
publication: Soil Biology and Biochemistry
volume: 37
number: 2
publisher: Elsevier
pagerange: 279-287
refereed: TRUE
issn: 0038-0717
official_url: http://dx.doi.org/10.1016/j.soilbio.2004.07.040
related_url_url: http://scholar.google.co.in/scholar?as_q=Modelling+nitrogen+mineralization+from+manures%3A+representing+quality+aspects+by+varying+C%3AN+ratio+of+sub-pools&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&as_yhi=&btnG=&hl=en&as_sdt
related_url_type: pub
citation:   Probert, M E and Delve, R J and Kimani, S K and Dimes, J P  (2005) Modelling nitrogen mineralization from manures: representing quality aspects by varying C:N ratio of sub-pools.  Soil Biology and Biochemistry, 37 (2).  pp. 279-287.  ISSN 0038-0717     
document_url: http://oar.icrisat.org/6377/1/SoilBiologyBiochemistry_37_2_279-287_2005.pdf