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Title: Overcoming the Confounding Effects of Salinity on Sodic Soil Research
Contributor(s): Dodd, Kylie (author); Guppy, Christopher  (author)orcid ; Lockwood, Peter  (author)
Publication Date: 2010
DOI: 10.1080/00103624.2010.504801
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Abstract: The adverse effects of sodicity on plant growth are difficult to quantify using naturally occurring soils because of the confounding variation in other soil properties, particularly salinity, pH, organic matter, soil nutrients, mineralogy, and texture. We applied a method involving the equilibration of large soil volumes with solutions varying in sodium adsorption ratio (SAR), followed by excess salt removal with solutions of similar SAR but lower ionic strength. Application of this method to a calcareous nonsodic, nonsaline Vertosol from Narrabri, New South Wales, resulted in soils with exchangeable sodium percentage (ESP) values between 2% and 25% but with similar magnesium and potassium concentrations and constant electrical conductivity (∼2.7 dS/m). Soil pH and solution phosphorus concentrations automatically increased as the ESP of the soil rose, which is important to consider when addressing plant growth results. This method can successfully minimize the confounding of sodicity with other soil properties that so often plagues sodic soil research.
Publication Type: Journal Article
Source of Publication: Communications in Soil Science and Plant Analysis, 41(18), p. 2211-2219
Publisher: Taylor & Francis
Place of Publication: London, United Kingdom
ISSN: 0010-3624
Field of Research (FOR): 050304 Soil Chemistry (excl Carbon Sequestration Science)
Socio-Economic Outcome Codes: 820301 Cotton
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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