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Sulfur cycling in Swedish arable soils

a chemical perspective

Boye, Kristin (2011). Sulfur cycling in Swedish arable soils. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2011:74
ISBN 978-91-576-7618-4
[Doctoral thesis]

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Sulfur (S) is an essential plant nutrient. Decreased S deposition in combination with a switch to high-analysis N/P-fertilizers has increased the need for S fertilization. Thus, soil research directed at understanding soil sulfur properties and processes has intensified. However, the methodology at hand has been insufficient for determining relationships between soil properties, S cycling and S availability to crops.

In this thesis, recently developed methods were used to study the effect on soil S by two management systems, livestock production and arable crop production, at five different locations within a Swedish long-term fertility field experimental series. In an open incubation study, and a pot trial, where isotopic labeling (35S) was used to trace S transformations, S cycling rates were higher in the livestock system, especially in one soil (Orup). The S delivering capacity of all soils was too low to avoid S deficiency in ryegrass without mineral S application. Observed differences in S cycling patterns could not be satisfactorily explained by soil properties; however, multivariate analyses indicated net S mineralization was negatively related to C/N-ratios and SO42- content. The extent of organic S stabilization through organomineral association and physical protection within microaggregates was investigated by an extraction/dispersion method. The relative distribution between the pools varied between soils, with the residual (non-extractable) pool always being largest; however, only the physically protected fraction was negatively related to plant S uptake. All soil organic S pools were involved in S transformations, although the residual pool was less active than the other pools. Chemical speciation of S in soils and soil fractions was determined by S K-edge X-Ray Absorption Near-Edge Structure (XANES) spectroscopy. A new method for fitting spectra provided reliable quantification of S species by using internally calibrated spectra of dilute (30mM) model compounds. The response of S speciation to management system differed between soils, but highly oxidized S dominated in the organomineral fractions, and intermediate forms of oxidized S in the residual fraction.

In conclusion, soil organic S speciation can be accurately quantified by S K-edge XANES spectroscopy. The speciation differs between organomineral associated S and residual S. Treatment effects are dependent on soil type, but S cycling is stimulated by long-term farmyard manure application, as seen in the livestock system.

Authors/Creators:Boye, Kristin
Title:Sulfur cycling in Swedish arable soils
Subtitle:a chemical perspective
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :30 September 2011
Number of Pages:62
I.Boye, K., Nilsson, S.I., Eriksen, J. (2009). Net sulfur mineralization potential in Swedish arable soils in relation to long-term treatment history and soil properties. Biology and Fertility of Soils 45 (7), 743-751.
II.Boye, K., Eriksen, J., Nilsson, S.I., Mattson, L. (2010). Sulfur flow in a soil-plant system – effects of long-term treatment history and soil properties. Plant and Soil 334 (1-2), 323-334.
III.Almkvist, G., Boye, K., Persson, I. (2010). K-edge XANES analysis of sulfur compounds: an investigation of the relative intensities using internal calibration. Journal of Synchrotron Radiation 17, 683-688.
IV.Boye, K., Almkvist, G., Nilsson, S.I., Eriksen, J., Persson, I. (2011). Quantification of chemical S species in bulk soil and organic S fractions by S K-edge XANES spectroscopy. European Journal of Soil Science, accepted for publication. DOI: 10.1111/j.1365-2389.2011.01391.x.
Place of Publication:Uppsala
Publisher:Dept. of Soil and Environment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7618-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F04 Fertilizing
F Plant production > F08 Cropping patterns and systems
P Natural resources > P35 Soil fertility
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Agrovoc terms:sulphur, soil fertility, plant soil relations, nutrient availability, sulphur fertilizers, farmyard manure, organic matter, x ray spectroscopy, alternative agriculture, conventional farming, field experimentation, sweden
Keywords:soil sulfur, quantitative sulfur speciation, S K-edge XANES, organomineral stabilization, organic matter, farmyard manure, long-term effect, plant availability
Permanent URL:
ID Code:8340
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
External funders:FORMAS
Deposited By: Kristin Boye
Deposited On:30 Sep 2011 11:39
Metadata Last Modified:02 Dec 2014 10:47

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