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Published online 29 October 2007
Published in Soil Sci Soc Am J 71:1926-1933 (2007)
DOI: 10.2136/sssaj2006.0424
© 2007 Soil Science Society of America
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Mineral and Organic Matter Controls on the Sorption of Macronutrient Anions in Variable-Charge Soils

Brian D. Strahm* and Robert B. Harrison

College of Forest Resources, Univ. of Washington, Seattle, WA 98195


Figure 1
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  		Fig. 1. Net surface charge (dashed line), cation sorption (open circles), and anion sorption (filled triangles) for the <2-mm fraction of each soil. Only WA-Boistfort exhibited a point of zero net charge (pH = 3.8) within the pH range investigated (2 ≤ pH ≤ 9).

 

Figure 2
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  		Fig. 2. Quantity of NO3– sorbed per kilogram of dry soil across a range of equilibrium NO3– solution concentrations at pH = 4.0 ± 0.1 for HI-Wahiawa (filled triangles), ME-Rawsonville (open circles), NC-Cecil (open triangles), PR-Bayamon (open squares), WA-Boistfort (filled circles), and WA-Grove (closed squares) soils. Lines represent Langmuir sorption isotherms.

 

Figure 3
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  		Fig. 3. Quantity of SO42– sorbed per kilogram of dry soil across a range of equilibrium SO42– solution concentrations at pH = 4.0 ± 0.1 for HI-Wahiawa (closed triangles), ME-Rawsonville (open circles), NC-Cecil (open triangles), PR-Bayamon (open squares), WA-Boistfort (filled circles), and WA-Grove (filled squares) soils. Lines represent Langmuir sorption isotherms.

 

Figure 4
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  		Fig. 4. Quantity of H2PO4– sorbed per kilogram of dry soil across a range of equilibrium H2PO4– solution concentrations at pH = 4.0 ± 0.1 for HI-Wahiawa (filled triangles), ME-Rawsonville (open circles), NC-Cecil (open triangles), PR-Bayamon (open squares), WA-Boistfort (filled circles), and WA-Grove (closed squares) soils. Lines represent Langmuir sorption isotherms.

 




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