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Article: The long-term effects of lime (CaC[O.sub.3]), gypsum (CaS[O.sub.4].2[H.sub.2]O), and tillage on the physical and chemical properties of a sodic red-brown earth.(Statistical Data Included)
- Article from:
- Australian Journal of Soil Research
- Article date:
- November 1, 2001
- Author:
CopyrightCOPYRIGHT 2001 CSIRO Publishing. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Introduction
Sodic soils contain disproportionately high levels of sodium ([Na.sup.+]) ions relative to calcium ([Ca.sup.2+]) and magnesium ([Mg.sup.2+]) ions in the soil exchange sites and in the soil solution. These soils have poor physical and chemical fertility which impedes water infiltration, water availability, and ultimately plant growth (Johnston 1975; Charman and Murphy 1991; Fitzpatrick et al. 1995; Jayawardane and Chan 1995; Valzano 1996; Sumner and Naidu 1998). Sodic soils are largely defined from the exchangeable sodium percentage (ESP) of the soil (USSL Staff 1954; Northcote and Skene 1972; McIntyre 1979; Sposito 1989; Isbell 1996). In Australia, ...