The University of Southampton
University of Southampton Institutional Repository

Gypsum applications to aggregated saline sodic clay topsoils

Record type: Article

Gypsum application was highly efficient as a treatment for reducing amounts of exchangeable sodium and inhibiting clay dispersion in highly structured saline-sodic clay topsoils.

Phosphogypsum, applied to the surfaces of aggregates in soil columns treated with simulated rainfall, was dissolved efficiently by frequent intermittent 'rainfall'. The calcium released by dissolution displaced sodium on the exchange complex within soil aggregates ranging from 7.5 mm to 45 mm in diameter. Of the applied calcium, 64–74% was transferred to ion exchange sites; however, almost one-third of this adsorbed calcium displaced exchangeable magnesium.

Comparison of three gypsum treatments, phosphogypsum, rock gypsum, and a saturated gypsum solution (representing a top dressing of highly soluble gypsum), showed that the effectiveness of calcium uptake on the exchange complex followed the order: rock gypsum < saturated solution < phosphogypsum, but differences were small.

Application of phosphogypsum caused a 90% reduction in the total amount of dispersed clay released in column leachates, and decreased the maximum clay concentration in the effluents by at least 80%, when compared to soils leached without gypsum treatment.

Full text not available from this repository.

Citation

Armstrong, A.S.B. and Tanton, T.W. (1992) Gypsum applications to aggregated saline sodic clay topsoils European Journal of Soil Science, 43, (2), pp. 249-260. (doi:10.1111/j.1365-2389.1992.tb00133.x).

More information

Published date: 1992

Identifiers

Local EPrints ID: 75600
URI: http://eprints.soton.ac.uk/id/eprint/75600
ISSN: 1351-0754
PURE UUID: 6ecbbdaf-7d28-42d2-90d3-6d69684c0f10

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:42

Export record

Altmetrics


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×