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DIVISION S-2-SOIL CHEMISTRY

Phosphorus Sorption, Desorption, and Buffering Capacity in a Biosolids-Amended Mollisol

^a Agronomy Dep., Iowa State Univ., Ames, IA 50011-1010 USA

mlthomps{at}iastate.edu

To investigate the impact of biosolids amendments to soil on the sorption, desorption, and buffering capacity of P, laboratory experiments were conducted on soil samples collected from a field study on a Mollisol amended with three levels of biosolids. The potential for sorption of additional P and the binding intensity of P were evaluated by applying the two-surface Langmuir model to sorption isotherms. Over the range of equilibrium P concentrations in this study, the ability of the soil to sorb added P decreased due to biosolids amendment. Addition of biosolids to the soil also decreased indices of the P-binding intensity at both the high- and low-affinity sites. The P equilibrium buffering capacity (PEBC) significantly decreased and the equilibrium P concentration (EPC) significantly increased after biosolids amendment. P desorption from soil samples with and without biosolids amendment was investigated for different equilibration periods and at various liquid/solid ratios. The amount of P that could be desorbed from the soil significantly increased after biosolids amendment. The effects of biosolids amendments on indices of soil P sorption–desorption phenomena (binding energy, PEBC, and EPC) imply a large increase in the P concentration of the soil solution. The increase of soluble forms of P in soil solution of this soil, which was heavily amended with biosolids, could enhance the loss of P in runoff and P movement below the root zone.

Abbreviations: EPC, equilibrium P concentration • PAN, potentially available N • PEBC, P equilibrium buffering capacity • Q/I, quantity/intensity • SOC, soluble organic C

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