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Soil organic matter fractionation as a tool for predicting nitrogen mineralization in silty arable soils

MD Abdul Kader UGent, Steven Sleutel UGent, Shamim Ara Begum UGent, Karoline D’Haene, Kanagaratnam Jegajeevagan UGent and Stefaan De Neve UGent (2010) SOIL USE AND MANAGEMENT. 26(4). p.494-507
abstract
After decades of searching for a practical method to estimate the N mineralization capacity of soil, there is still no consistent methodology. Indeed it is important to have practical methods to estimate soil nitrogen release for plant uptake and that should be appropriate, less time consuming, and cost effective for farmers. We fractionated soil organic matter (SOM) to assess different fractions of SOM as predictors for net N mineralization measured from repacked (disturbed) and intact (undisturbed) soil cores in 14 weeks of laboratory incubations. A soil set consisting of surface soil from 18 cereal and root-cropped arable fields was physically fractionated into coarse and fine free particulate OM (coarse fPOM and fine fPOM), intra-microaggregate particulate OM (iPOM) and silt and clay sized OM. The silt and clay sized OM was further chemically fractionated by oxidation with 6% NaOCl to isolate an oxidation-resistant OM fraction, followed by extraction of mineral bound OM with 10% HF (HF-res OM). Stepwise multiple linear regression yielded a significant relationship between the annual N mineralization (kg N/ha) from undisturbed soil and coarse fPOM N (kg N/ha), silt and clay N (kg N/ha) and its C:N ratio (R2 = 0.80; P < 0.01). The relative annual N mineralization (% of soil N) from disturbed soils was related to coarse fPOM N, HF-res OC (% of soil organic carbon) and its C:N ratio (R2 = 0.83; P < 0.01). Physical fractions of SOM were thus found to be the most useful predictors for estimating the annual N mineralization rate of undisturbed soils. However, the bioavailability of physical fractions was changed due to the disturbance of soil. For disturbed soils, a presumed stable chemical SOM fraction was found to be a relevant predictor indicating that this fraction still contains bio-available N. The latter prompted a revision in our reasoning behind selective oxidation and extraction as tools for characterizing soil organic N quality with respect to N availability. Nonetheless, the present study also underscores the potential of a combined physical and chemical fractionation procedure for isolating and quantifying N fractions which preferentially contribute to bulk soil N mineralization. The N content or C:N ratio of such fractions may be used to predict N mineralization in arable soils.
Please use this url to cite or link to this publication:
author
organization
alternative title
SOM fractionation as a tool for predicting nitrogen mineralization
year
type
journalArticle (original)
publication status
published
subject
keyword
STABILIZATION, CARBON, AVAILABILITY, SPECTROSCOPY, CULTIVATION, Chemical fractionation, nitrogen mineralization prediction, physical fractionation, silty arable loess soil, soil organic matter, TURNOVER, MANAGEMENT, SIZE, DYNAMICS, LIGHT-FRACTION
journal title
SOIL USE AND MANAGEMENT
Soil Use Manage.
volume
26
issue
4
pages
494 - 507
Web of Science type
Article
Web of Science id
000284592000011
JCR category
SOIL SCIENCE
JCR impact factor
1.51 (2010)
JCR rank
16/32 (2010)
JCR quartile
3 (2010)
ISSN
0266-0032
DOI
10.1111/j.1475-2743.2010.00303.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1063188
handle
http://hdl.handle.net/1854/LU-1063188
date created
2010-10-25 11:45:41
date last changed
2011-07-12 14:28:24
@article{1063188,
  abstract     = {After decades of searching for a practical method to estimate the N mineralization capacity of soil, there is still no consistent methodology. Indeed it is important to have practical methods to estimate soil nitrogen release for plant uptake and that should be appropriate, less time consuming, and cost effective for farmers. We fractionated soil organic matter (SOM) to assess different fractions of SOM as predictors for net N mineralization measured from repacked (disturbed) and intact (undisturbed) soil cores in 14 weeks of laboratory incubations. A soil set consisting of surface soil from 18 cereal and root-cropped arable fields was physically fractionated into coarse and fine free particulate OM (coarse fPOM and fine fPOM), intra-microaggregate particulate OM (iPOM) and silt and clay sized OM. The silt and clay sized OM was further chemically fractionated by oxidation with 6\% NaOCl to isolate an oxidation-resistant OM fraction, followed by extraction of mineral bound OM with 10\% HF (HF-res OM). Stepwise multiple linear regression yielded a significant relationship between the annual N mineralization (kg N/ha) from undisturbed soil and coarse fPOM N (kg N/ha), silt and clay N (kg N/ha) and its C:N ratio (R2 = 0.80; P {\textlangle} 0.01). The relative annual N mineralization (\% of soil N) from disturbed soils was related to coarse fPOM N, HF-res OC (\% of soil organic carbon) and its C:N ratio (R2 = 0.83; P {\textlangle} 0.01). Physical fractions of SOM were thus found to be the most useful predictors for estimating the annual N mineralization rate of undisturbed soils. However, the bioavailability of physical fractions was changed due to the disturbance of soil. For disturbed soils, a presumed stable chemical SOM fraction was found to be a relevant predictor indicating that this fraction still contains bio-available N. The latter prompted a revision in our reasoning behind selective oxidation and extraction as tools for characterizing soil organic N quality with respect to N availability. Nonetheless, the present study also underscores the potential of a combined physical and chemical fractionation procedure for isolating and quantifying N fractions which preferentially contribute to bulk soil N mineralization. The N content or C:N ratio of such fractions may be used to predict N mineralization in arable soils.},
  author       = {Kader, MD Abdul and Sleutel, Steven and Begum, Shamim Ara and D{\textquoteright}Haene, Karoline and Jegajeevagan, Kanagaratnam and De Neve, Stefaan},
  issn         = {0266-0032},
  journal      = {SOIL USE AND MANAGEMENT},
  keyword      = {STABILIZATION,CARBON,AVAILABILITY,SPECTROSCOPY,CULTIVATION,Chemical fractionation,nitrogen mineralization prediction,physical fractionation,silty arable loess soil,soil organic matter,TURNOVER,MANAGEMENT,SIZE,DYNAMICS,LIGHT-FRACTION},
  language     = {eng},
  number       = {4},
  pages        = {494--507},
  title        = {Soil organic matter fractionation as a tool for predicting nitrogen mineralization in silty arable soils},
  url          = {http://dx.doi.org/10.1111/j.1475-2743.2010.00303.x},
  volume       = {26},
  year         = {2010},
}

Chicago
Kader, MD Abdul, Steven Sleutel, Shamim Ara Begum, Karoline D’Haene, Kanagaratnam Jegajeevagan, and Stefaan De Neve. 2010. “Soil Organic Matter Fractionation as a Tool for Predicting Nitrogen Mineralization in Silty Arable Soils.” Soil Use and Management 26 (4): 494–507.
APA
Kader, M. A., Sleutel, S., Begum, S. A., D’Haene, K., Jegajeevagan, K., & De Neve, S. (2010). Soil organic matter fractionation as a tool for predicting nitrogen mineralization in silty arable soils. SOIL USE AND MANAGEMENT, 26(4), 494–507.
Vancouver
1.
Kader MA, Sleutel S, Begum SA, D’Haene K, Jegajeevagan K, De Neve S. Soil organic matter fractionation as a tool for predicting nitrogen mineralization in silty arable soils. SOIL USE AND MANAGEMENT. 2010;26(4):494–507.
MLA
Kader, MD Abdul, Steven Sleutel, Shamim Ara Begum, et al. “Soil Organic Matter Fractionation as a Tool for Predicting Nitrogen Mineralization in Silty Arable Soils.” SOIL USE AND MANAGEMENT 26.4 (2010): 494–507. Print.