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Colloidal and Dissolved Phosphorus in Sandy Soils as Affected by Phosphorus Saturation

Department of Soil Science, Institute of Ecology, Berlin University of Technology, Salzufer 11-12, D-10587 Berlin, Germany

View larger version (21K): [in a new window]   Fig. 1. Concentrations of dissolved P as a function of the degree of P saturation. *Significant at the 0.05 probability level. The split line was calculated for samples from the 30- to 60-cm depth of the Dülmen site. Do, Dülmen (old); Dn, Dülmen (new); H, Hamburg; N, Nienburg.

View larger version (22K): [in a new window]   Fig. 2. Colloidal P concentrations related to the degree of P saturation. *Significant at the 0.05 probability level. Do, Dülmen (old); Dn, Dülmen (new); H, Hamburg; N, Nienburg.

View larger version (25K): [in a new window]   Fig. 3. Effect of the degree of P saturation on concentrations of dissolved P, colloidal P, Fe + Al, P saturation of colloids, and optical density in KCl extracts. *Significant at the 0.05 probability level.