PHOSPHORUS IN FLORIDA WATERSHEDS: SCIENCE AND APPLICATIONS
Module 3: Use of Conventional Techniques for Evaluating Phosphorus in Soils
Module 3: Use of Conventional Techniques for Evaluating Phosphorus in Soils
Lecture 1: Isotherm determination
Describes how isotherms are determined, explains some isotherm models, and gives details on sorption isotherm experiments to evaluate phosphorus sorption properties of soils and sediments. Provides additional details on equations for the Langmuir isotherm, the single point isotherm and the Freundlich isotherm.
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References
- Bache, B.W., and E.G. Williams. 1971. A phosphate sorption index for soils. J. Soil Sci. 22:289-301.
- Graetz, D.A., and V.D. Nair. 2000. Phosphorus sorption isotherm determination. In: Pierzynski, G.M, editor, Methods of Phosphorus Analyses for Soils, Sediments, Residuals, and Waters. Southern Cooperative Series Bulletin No.396. SERA-IEG 17 Regional Publication. http://www.sera17.ext.vt.edu/Documents/Methods_of_P_Analysis_2000.pdf
- Harris, W.G., R.D. Rhue, G. Kidder, R.B. Brown, and R. Littell. 1996. Soil Sci. Soc. Am. J. 60:1513-1521.
- Reddy, K.R., G.A. O’Connor, and P.M. Gale. 1998. Phosphorus sorption capacities of wetland soils and stream sediments impacted by dairy effluent. J. Environ. Qual. 27:438-447
- Nair, V.D., and K.R. Reddy. 2013. Phosphorus sorption and desorption in wetland soils. In: DeLaune, R., Reddy, K.R., Richardson, C.J., and Megonigal, P. (ed). Methods on biogeochemistry of wetlands. Soil Science Society of America Publication. (in press).
- Reddy, K.R., M.R. Overcash, R. Khaleel, and P.W. Westerman. 1980. Phosphorus adsorption-desorption characteristics of two soils utilized for disposal of animal wastes. J. Environ. Qual. 9:86-92.Rhue, R.D., Harris, R.G., 1999. Phosphorus sorption/desorption reactions in soils and sediments. In: Reddy, K.R., O’Connor, G.A., Schleske, C.L. (Eds.), Phosphorus biogeochemistry in subtropical ecosystems. Lewis Publishers, Boca Raton, pp. 187–206.
Additional References
- Dari, B., V.D. Nair, and W.G. Harris. 2017. Approaches for evaluating subsurface phosphorus loss potential from soil profiles. Agric. Ecosyst. Environ. 245: 92-99.
- Dari, B., V.D. Nair, and W.G. Harris. 2017. Parameters for Site-Specific Soil Phosphorus Loss Modeling from Soil Test Data. SL442. http://edis.ifas.ufl.edu/pdffiles/SS/SS65600.pdf
- Dari, B., V.D. Nair, J. Colee, W.G. Harris, and R. Mylavarapu. 2015. Estimation of phosphorus isotherm parameters: a simple and cost-effective procedure. Front. Environ. Sci. 3:70. doi: 10.3389/fenvs.2015.00070.