Faculty Directory

Andrew N. Sharpley

Andrew N. Sharpley

Distinguished Professor of Soils and Water Quality

(DREX)-Director Experiment Station

(CSES)-Crop, Soil and Environmental Sciences

Phone: 479-575-2354

Fax: (479) 575-7465

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Dr. Sharpley is an international authority on assessing, managing, and remediating the impacts of agricultural management on soil and water resources.  His research investigates the cycling of phosphorus in soil-plant-water systems in relation to soil productivity and water quality and includes the management of animal manures, fertilizers, and crop residues.  He also evaluates the role of stream and river sediments in modifying phosphorus transport and response of receiving lakes and reservoirs.

Dr. Sharpley was the 2017 President of the Soil Science Society of America and the 2018 Chair of Alliance of Crop, Soil, and Environmental Science Societies.

Dr. Sharpley has authored or coauthored over 630 publications with the impact of this published research is evidenced by his refereed journal papers being cited 43,554 times since 1995 and 15,887 times since 2012, according to an ISI Web of Knowledge science citation index search.  He has an h index of 104 (a scholar with an index of h has published h papers each of which has been cited in other papers at least h times).  He was an Associate Editor for the Journal of Environmental Quality from 1984 to 1990 and 1992 to 2000; Technical Editor from 2003 to 2009; and Environmental Perspectives and Issues Editor from 2009 to 2012.  He was Editor-in-Chief of the Soil Science Society of America from 2012 to 2016.

Dr. Sharpley investigates real-world conservation issues and strategically applies his findings to increase national and international awareness of the effects of agriculture on water quality and to develop cost-efficient remedial measures that protect water quality.  He is continually sought by action agencies, producers, advisory groups, and other scientists and experts to provide up-to-date assessment of environmental issues and practical solutions.  He provides technical advice to members of the U.S. Senate and Congress, Farm Bureau, Chesapeake Bay Program, European Union, and United Nations.  Dr. Sharpley serves on National Academy of Science and EPA Scientific Advisory Boards and organizes regional, national, and international conferences, and been Keynote speaker at numerous national and international conferences.

Dr. Sharpley formulated equations that predict the transport of phosphorus (P) and nitrogen in runoff, which are used in current major water quality models.  His documentation and quantification of the relationship between runoff and soil P was the technical foundation of environmental management strategies, which were adopted by NRCS and EPA as part of major policy changes regarding land-application of manures. 

At the request of agencies charged with nutrient management standards and water quality policy, Dr. Sharpley led a multidisciplinary team development and refinement of P Indices to identify agricultural fields at greatest risk for nutrient loss.  The success of the P Index is demonstrated by the fact that in 47 states, NRCS have adopted it as the basis for their Comprehensive Nutrient Management Planning strategy to target conservation.  Such targeted strategies cost the livestock industry $355 million rather than $980 million per year, according to EPA and led to a reduction of 28,000 tons of P released from livestock operations to the environment in the U.S. alone. 



  • 1973, University of North Wales, Wales, Soil Science and Biochemistry, B.Sc.
  • 1977, Massey University, Palmerston North, New Zealand, Soil Science, Ph.D.

Sharpley, A.N., J.K. Syers, and P.W. O'Connor.  1976. Phosphorus inputs into a stream draining an agricultural watershed.  I.  Sampling.  Water, Air, and Soil Pollution, 6:39-52. 

Sharpley, A.N., and S.J.  Smith. 1983. Distribution of phosphorus forms in virgin and cultivated soils and potential erosion losses.  Soil Sci. Soc. Am. J. 47:581-586. 

Sharpley, A.N., C. Gray, C.A. Jones, and C.V. Cole.  1984. A simplified soil and plant phosphorus model.  II.  Prediction of labile, organic and sorbed P.  Soil Sci. Soc. Am. J. 48:805-809. 

Sharpley, A.N.  1985. The cycling of phosphorus in unfertilized and fertilized agricultural soils.  Soil Sci. Soc. Am. J. 49:905-911. 

Sharpley, A.N.  1985. Depth of surface soil-runoff interaction as affected by rainfall, soil slope, and management.  Soil Sci. Soc. Am. J. 49:1010-1015. 

Sharpley, A.N.  1985. The selective erosion of plant nutrients in runoff.  Soil Sci. Soc. Am. J. 49:1527-1534. 

Sharpley, A.N., S.J. Smith, and R.G. Menzel.  1986. Phosphorus criteria and water quality management for agricultural watersheds.  Lake and Reserv. Managt. 2:177-182. 

Sharpley, A.N.  1993. Assessing phosphorus bioavailability in agricultural soils and runoff.  Fertilizer Research 36:259-272. 

Sharpley, A.N., S.J. Smith, and R. Bain.  1993.  Effect of poultry litter application on the nitrogen and phosphorus content of Oklahoma soils.  Soil Sci. Soc. Am. J. 57:1131-1137.

Sharpley, A.N., and S.J. Smith.  1994. Wheat tillage and water quality in the Southern Plains.  Soil and Tillage Research.  30:33-48.

Sharpley, A.N., S.C. Chapra, R. Wedepohl, J.T. Sims, T.C Daniel, and K.R. Ready. 1994. Managing agricultural phosphorus for protection of surface waters: Issues and options.  J. Environ. Qual. 23:437-451.

Sharpley, A.N.  1995. Identifying sites vulnerable to phosphorus loss in agricultural runoff.  J. Environ. Qual. 24:947-951. 

Sharpley, A.N.  1995. Dependence of runoff phosphorus on soil phosphorus.  J. Environ. Qual. 24:920-926. 

Sharpley, A.N., and S.J. Smith.  1995. Nitrogen and phosphorus forms in soils receiving manure.  Soil Sci. 159:253-258. 

Sharpley, A.N. 1996. Availability of residual phosphorus in manured soils.  Soil Sci. Soc. Am. J. 60:1459-1466. 

Sharpley, A.N., T.C. Daniel, J.T. Sims, and D.H. Pote.  1996. Determining environmentally sound soil phosphorus levels.  J. Soil Water Conserv. 51:160-166.

Gburek, W.J. and A.N. Sharpley. 1998. Hydrologic controls on phosphorus loss from upland agricultural watersheds.  J. Environ. Qual. 27:267-277. 

Sharpley, A.N.  1999. Agricultural phosphorus, water quality and poultry production: Are they compatible?  Poultry Science 78:660-673. 

Sharpley, A.N., T.C. Daniel, J.T. Sims, J. Lemunyon, R.A. Steven, and R. Parry. 1999. Agricultural phosphorus and eutrophication.  USDA-ARS Report 149, U.S. Govt. Printing Office, Washington, D.C.  37pp.

Sharpley, A.N., and B. Moyer.  2000. Forms of phosphorus in manures and composts and their dissolution during rainfall.  J. Environ Qual. 29:1462-1469.

Sharpley, A.N., and H. Tunney.  2000. Phosphorus research strategies to meet agricultural and environmental challenges of the 21st century.  J. Environ. Qual. 29:176-181. 

Gburek, W.J., A.N. Sharpley, A.L. Heathwaite, and G.J. Folmar. 2000. Phosphorus management at the watershed scale.  J. Environ. Qual. 29:130-144. 

Haygarth, P.M., and A.N. Sharpley. 2000. Terminology for phosphorus transfer.  J. Environ. Qual. 29:10-15. 

Heathwaite, A.L., A.N. Sharpley, and W.J. Gburek. 2000. Integrating phosphorus and nitrogen management at catchment scales.  J. Environ. Qual.  29:158-166. 

Sharpley, A. N., McDowell, R. W., and Kleinman, P. J. A.  2001.  Phosphorus loss from land and water: Integrating agricultural and environmental management.  Plant and Soil.  237:287-307. 

Sharpley, A. N., Kleinman, P. J. A., McDowell, R.W., and Weld, J. L. 2001. Assessing site vulnerability to phosphorus loss in an agricultural watershed. J. Environ. Qual. 30:2026-2036. 

McDowell, R.W., and A.N. Sharpley. 2001. Approximating phosphorus release from soil to surface and subsurface drainage.  J. Environ. Qual. 30:508-520. 

Sharpley, A.N., P.J.A. Kleinman, R.W. McDowell, M. Gitau, and R.B. Bryant.  2002.  Modeling phosphorus transport in agricultural watersheds: Processes and possibilities.  J. Soil Water Conserv.  57(6):425-439. 

Sharpley, A.N.  2003. Soil mixing to reduce surface stratification of phosphorus in manured soils.  J. Environ. Qual.  32:1375-1384. 

Sharpley, A.N., and P.J.A.  Kleinman. 2003. Effect of rainfall simulator and plot scale on overland flow and phosphorus transport.  J. Environ. Qual. 32:2172-2179. 

Sharpley, A.N., T.C. Daniel, G. Gibson, L. Bundy, M. Cabrera, J.T. Sims, R. Stevens, J. Lemunyon, P.J.A. Kleinman, and R. Parry.  2006. Best management practices to minimize agricultural phosphorus impacts on water quality.  USDA-ARS Publication 163. 

Sharpley, A.N., S. Herron, and T.C. Daniel.  2007. Overcoming the challenges of phosphorus-based nutrient management in poultry farming.  J. Soil Water Conserv. 62(6):375-389.

Sharpley, A.N., S Herron, and T.C. Daniel.  2007. Phosphorus-based management challenges and strategies for poultry farming.  J. Soil Water Conserv. 62(6):152-153. 

Sharpley, A.N., P.J.A. Kleinman, A.L. Heathwaite, W.L. Gburek, G.L. Folmar, and J.P. Schmidt.  2008. Phosphorus loss from an agricultural watershed as a function of storm size.  J. Environ. Qual. 37:362-368. 

Sharpley, A.N., P.J.A. Kleinman, A.L. Heathwaite, W.L. Gburek, J.L. Weld, and G.L. Folmar. 2008. Integrating contributing areas and indexing phosphorus loss from agricultural watersheds.  J. Environ. Qual. 37:1488-1496. 

Simpson, T.W., A.N. Sharpley, R.W. Howarth, H.W. Paerl, and K.R. Mankin. 2008. The new gold rush:  Fueling ethanol production while protecting water quality.  J. Environ. Qual. 37:318-324. 

Sharpley, A.N., P.J.A. Kleinman, P. Jordan, L. Bergström, and A.L. Allen.  2009. Evaluating the success of phosphorus management from field to watershed.  J. Environ Qual.  38:1981-1988. 

Sharpley, A.N., P.J.A. Kleinman, D.N. Flaten, and A.R. Buda. 2011. Critical source area management of agricultural phosphorus: experiences, challenges and opportunities.  Water Sci. Technol.  64(4):945-952.

Sharpley, A.N., P. Richards, S. Herron, and D. Baker.  2012.  Comparison between litigated and voluntary nutrient management strategies.  J. Soil Water Conserv.  (67)5:442-450. 

Sharpley, A.N., C. Beegle, C. Bolster, L.W. Good, B. Joern, Q. Ketterings, J. Lory, R. Mikkelsen, D. Osmond, and P.A. Vadas. 2012. Phosphorus indices: Why we need to take stock of how we are doing. J. Environ. Qual. 41:1711-1718. 

Osmond, D.L., A.N. Sharpley, C. Bolster, M. Cabrera, S. Feagley, B. Lee, C. Mitchell, R. Mylavarapu, L. Oldham, F. Walker, and H. Zhang.  2012. Comparing phosphorus indices from twelve southern USA states against monitored phosphorus loads from six prior southern studies.  J. Environ. Qual. 41:1741-1750.

Sharpley, A.N., H.P. Jarvie, A. Buda, L. May, B. Spears, and P. Kleinman. 2013. Phosphorus legacy: Overcoming the effects of past management practices to mitigate future water quality impairment.  J. Environ. Qual.  42:1308-1326.

Jarvie, H.P., A.N. Sharpley, T. Scott, B. Haggard, M. Bowes, and L. Massey. 2013. Within-River phosphorus retention: Accounting for a missing piece in the watershed phosphorus puzzle.  Environ. Sci. Technol. 46 (24):13284–13292.

Jarvie, H.P., A.N. Sharpley, P. Withers, J. Scott, B. Haggard, and C. Neal.  2013.  Phosphorus mitigation to control river eutrophication: Murky waters, inconvenient truths and ‘post-normal’ science.  J. Environ. Qual.  42:295–304. 

Sharpley, A.N., and X. Wang.  2014.  Managing agricultural phosphorus for water quality: lessons from the USA and China.  J. Environ. Sci. 26(9):1770-1782.

Jarvie, H.P., A.N. Sharpley, J.V. Brahana, T. Simmons, A. Price, C. Neal, A. Lawlor, D. Sleep, S. Thacker, and B. Haggard.  2014.  Phosphorus retention and remobilization along hydrological pathways in karst terrain.  Environ. Sci. Technol. 48:4860−4868.

Dodd, R.J., and A.N. Sharpley.  2015.  Recognizing the role of soil organic phosphorus in soil fertility and water quality.  Resour. Conserv. Recycl. 105:282-293.

Sharpley, A.N., L. Bergström, H. Aronsson, M. Bechmann, C. Bolster, K. Börling, F. Djodjic, H. Jarvie, O. Schoumans, C. Stamm, K. Tonderski, B. Ulen, R. Uusitalo, and P. Withers.  2015.  Future agriculture with minimized phosphorus losses to waters: research needs and direction.  AMBIO 44(suppl 2):S163-S179. 

Kleinman P.J.A., A.N. Sharpley, P.J.A. Withers, L. Bergstrom, L.T. Johnson, and D.G. Doody.  2015.  Implementing agricultural phosphorus science and management to combat eutrophication.  AMBIO 44(Suppl. 2):S297-S310.

Jarvie, H.P., A.N. Sharpley, D. Flaten, P.J.A. Kleinman, A. Jenkins, and T. Simmons.  2015. The pivotal role of phosphorus in a resilient water-energy-food security nexus.  J Environ. Qual.  44(5):1308-1326.

Sharpley, A.N., P.J.A. Kleinman, H.P. Jarvie, and D. Flaten.  2016.  Distant views and local realities: The Limits of global assessments to restore the fragmented phosphorus cycle.  Agric. Environ. Lett. 1:160024.

Dodd, R.J., and A.N. Sharpley.  2016.  Conservation practice effectiveness and adoption: Unintended consequences and implications for sustainable phosphorus management.  Nut. Cycling Agroecosys. 104:373–392.

Sharpley, A.N., P.J.A. Kleinman, C. Baffaut, D. Beegle, C. Bolster, A. Collick, Z. Easton, J. Lory, N. Nelson, D. Osmond, D. Radcliffe, T. Veith, and J. Weld.  2017.  Evaluation of phosphorus site assessment tools: Lessons from the U.S.A. J. Environ. Qual. 46:1250-1256.

Sharpley, A.N., B.E. Haggard, L. Berry, K. Brye, J. Burke, M.B. Daniels, E. Gbur, T. Glover, P. Hays, T. Kresse, and K.W. VanDevender.  2017.  Nutrient concentrations in Big Creek correlate to regional watershed land use.  Agricultural & Environmental Letters 2017 2:170027. 

Jarvie, H.P., L.T. Johnson, A.N. Sharpley, D.R. Smith, D.B. Baker, T. Bruulsema, and R. Confesor.  2017. Increased soluble phosphorus loads to Lake Erie: Unintended consequences of conservation practices? J. Environ. Qual. 46(1):123-132.

Kleinman, P.J.A., A.N Sharpley, A. Buda, Z. Easton, J. Lory, D. Osmond, D. Radcliffe, N. Nelson, T. Veith, and D. Doody.  2017.  The promise, practice, and state of planning tools to assess site vulnerability to runoff phosphorus loss.  J. Environ. Qual. 46:1243-1240. 

Professional Background

2012 to present: Distinguished Professor, Department of Crop, Soil and Environmental Sciences, Division of Agriculture University of Arkansas, Fayetteville, Arkansas.

2006 – 2012, Professor, Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR

1995 – 2006, Soil Scientist, USDA-ARS, University Park, PA, and Adj. Prof., Penn State Univ.

1985 – 1995, Soil Scientist, USDA-ARS, Durant, OK

Professional Involvement/Memberships:

Soil Science Society of America

American Society of Agronomy

International Soil Science Society

Soil Water Conservation Society


Gamma Sigma Delta

Fellow, American Society of Agronomy, 1990 and Soil Science Society of America, 1991.

Environmental Quality Research Award, American Society of Agronomy, 1994.

USDA-ARS, Northeast Atlantic Area Research Scientist of the Year Award, 1998.

Soil Science Applied Research Award, Soil Science Society of America, 1998.

Northeastern Branch of American Society of America’s Research Award, 2001.

USDA Secretary’s Honor Award, 2001.

USDA Secretary’s Plow Honor Award for Group Achievements in “Maintaining and Enhancing the Nation’s Natural Resources and Environment,” 2003.

Soil Science Research Award, Soil Science Society of America, 2003.

USDA-ARS Technology Transfer Award, 2004.

USDA-ARS “Hall of Fame” inductee, 2008.

International Plant Nutrition Institute Science Award, 2010

Hugh Hammond Bennett Award, Soil and Water Conservation Society, 2011.

Honorary Doctorate from the Swedish Univ. Agricultural Sciences, Uppsala, Sweden.  2011.

John W. White Outstanding Team Award, Division of Agriculture, Univ. Arkansas, 2012.

Distinguished Agriscience Scientist Award, Christopher Columbus Fellowship Foundation, 2012.

Fellow, Soil and Water Conservation Society, 2015.

John W. White Outstanding Team Award, Division of Agriculture, Univ. Arkansas, 2018.