A UV absorbance test for measuring humified organic carbon in soil

Paper

Eberhard, F. and Pittaway, P.. 2014. "A UV absorbance test for measuring humified organic carbon in soil ." Bruce, R. C. (ed.) 36th Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2014). Gold Coast, Australia 29 Apr - 01 May 2014 Mackay, Australia.
Paper/Presentation Title

A UV absorbance test for measuring humified organic carbon in soil

Presentation TypePaper
AuthorsEberhard, F. (Author) and Pittaway, P. (Author)
EditorsBruce, R. C.
Journal or Proceedings TitleProceedings of the 36th Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2014)
ERA Conference ID50305
Journal Citation36, pp. 229-235
Number of Pages7
Year2014
Place of PublicationMackay, Australia
ISBN9781634393782
Web Address (URL) of Paperhttp://toc.proceedings.com/23743webtoc.pdf
Conference/Event36th Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2014)
Australian Society of Sugar Cane Technologists Conference
Event Details
36th Annual Conference of the Australian Society of Sugar Cane Technologists (ASSCT 2014)
Event Date
29 Apr 2014 to end of 01 May 2014
Event Location
Gold Coast, Australia
Event Details
Australian Society of Sugar Cane Technologists Conference
ASSCT
Abstract

Standard methods used for measuring soil organic carbon are insensitive to short-term changes associated with soil management practices. The conventional wet oxidation and furnace induction methods (Raymont and Lyons 2011) measure all forms of soil organic carbon to some extent, not differentiating between rapidly recycled plant debris, organic residues, soil biomass or more resilient soil humic substances. The only accepted laboratory method for measuring resilient, sequestered carbon in soil (nuclear magnetic resonance or NMR), requires expensive laboratory equipment. Our new method uses off-the-shelf equipment developed for quantifying aquatic humic substances, measuring Ultraviolet (UV) light absorbance.
UV absorbance at 253.7 nm is strongly correlated with resilient aromatic compounds in aquatic humic substances quantified using NMR analysis. We have adapted water quality protocols for humified Dissolved Organic Carbon (DOC), for measuring humified organic carbon in soil. Under laboratory and field conditions, the UV method is sufficiently sensitive to detect changes in the concentration of humified DOC in soil amended with mulch only, or with mulch and compost. Results for total DOC and Specific UV Absorbance (SUVA; UV absorbance standardised per mg of DOC) for nine sugarcane soils, revealed large differences in total and humified DOC that were related to soil acidity. The soil health properties associated with humic substances include pH buffering, nutrient and water holding capacity, and improved soil structure. Further testing will validate the utility of the UV method for benchmarking and monitoring the impact of land management practices on soil health.

Keywordssoil carbon; soil health; aquatic humic substances; field testing; ultraviolet light
ANZSRC Field of Research 2020410101. Carbon sequestration science
410699. Soil sciences not elsewhere classified
300499. Crop and pasture production not elsewhere classified
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Byline AffiliationsNational Centre for Engineering in Agriculture
Institution of OriginUniversity of Southern Queensland
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