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Published online 20 September 2006
Published in Soil Sci Soc Am J 70:1825-1833 (2006)
DOI: 10.2136/sssaj2005.0285
© 2006 Soil Science Society of America
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Influence of Sodicity, Clay Mineralogy, Prewetting Rate, and Their Interaction on Aggregate Stability

Victor M. Ruiz-Veraa and Laosheng Wub,*

a Colegio de Postgraduados, Campus San Luis Potosí, Iturbide 73, Salinas, S.L.P. 78600, Mexico
b Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521, USA


Figure 1
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  		Fig. 1. Brief description of the process (flow chart) used to increase the sodium adsorption ratio (SAR) of the test soils.

 

Figure 2
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  		Fig. 2. Effect of sodium adsorption ratio (SAR) and prewetting rate (PWR) on aggregate-size distribution of three soils ((a) Malibu, (b) Millox, and (c) Mokelumne) with different clay mineralogy. The figure shows the proportion of aggregates that remained on the group of size 1 to 2 mm after prewetting at 2 or 30 mm h–1 and sieved according to the aggregate stability procedure (the error bar indicates the standard error of the mean).

 

Figure 3
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  		Fig. 3. Effect of sodium adsorption ratio (SAR) and prewetting rate (PWR) on aggregate-size distribution of three soils ((a) Malibu, (b) Millox, and (c) Mokelumne) with different clay mineralogy. The figure shows the proportion of aggregates of size 1 to 0.25 mm after prewetting at 2 or 30 mm h–1 with solutions of SAR 0, 20, and 50 and total chloride concentration of 6 mmolc L–1, and sieved according to the aggregate stability procedure (the error bar indicate the standard error of the mean).

 

Figure 4
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  		Fig. 4. Effect of SAR and PWR on aggregate-size distribution of three soils ((a) Malibu, (b) Millox, and (c) Mokelumne) with different clay mineralogy. The figure shows the proportion of aggregates of size <0.25 mm after prewetting at 2 or 30 mm h–1 with solutions of SAR 0, 20, and 50 and total chloride concentration of 6 mmolc L–1, and sieved according to the aggregate stability procedure (the error bar indicate the standard error of the mean).

 

Figure 5
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  		Fig. 5. Effect of SAR and PWR on surface soil dispersion (determined as transmittance [%] of suspensions obtained from dispersed surface soil) of the (a) Malibu (b) Millox, and (c) Mokelumne soils (bars indicate the standard error of the mean).

 




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