Responsibilities and Interests:

Conceive, develop, and implement N management research to sustain agricultural ecosystems and protect water quality. Couple N management to hydrology and P management, focusing on defining critical source areas and flow pathways at the landscape and watershed scales. Advisor to students, state and federal government agencies, and other organizations on N management and related water quality issues.

Education:

• 1994 Ph.D. North Carolina State University, Soil Science, Statistics minor
• 1991 M.S. North Carolina State University, Soil Science, Statistics minor
• 1985 B.S. University of Illinois, Soil Science

Professional Background:

• 2004–present Soil Scientist, USDA-ARS-PSWMRU, University Park, Pennsylvania
• 2004–present Adjunct Associate Professor, Department of Crop and Soil Sciences, The Pennsylvania State University, University Park, Pennsylvania
• 2003–2004 Associate Professor, Department of Agronomy, Kansas State University
• 1997–2003 Assistant Professor, Department of Agronomy, Kansas State University
• 1996–1997 Post Doctoral Research Associate, Department of Soil, Water, and Climate, University of Minnesota
• 1994–1996 Post Doctoral Research Fellow, Oak Ridge Institute for Science and Education, US EPA Laboratory - Corvallis, Oregon
• 1986–1988 U.S. Peace Corps Volunteer, The University of South Pacific - Alafua, Western Samoa

Selected Publications:

1. Castellano, M.J., J.P. Schmidt, J.P. Kaye, C. Walker, C. Graham, H. Lin, and C. Dell. In review 2009. Hydrological and biogeochemical controls on nitrous oxide flux across an agricultural landscape. Global Change Biology __:__-__.
2. Sanderson, M.A., C. Feldman, J. Schmidt, A. Herrman, and F. Taube. In review 2009. Spatial distribution of livestock concentration areas and soil nutrients in pastures. J. Soil Water Conserv. __:__-__.
3. Zhu, Q., J.P. Schmidt, H.S. Lin, and R.P. Sripada. In review 2009. Hydropedological processes and their implications for nitrogen availability to corn. Geoderma __:__-__.
4. Rotz, C.A., K.J. Soder, R.H. Skinner, C.J. Dell, P.J. Kleinman, J.P. Schmidt, and R.B. Bryant. Accepted 2009. Grazing can reduce the environmental impact of dairy production systems. Forage and Grazinglands. __:__-__.
5. Shigaki, F., J.P. Schmidt, P.J. Kleinman, A.N. Sharpley, and A.L. Allen. Accepted 2009. Nitrogen fate in drainage ditches of the Coastal Plain after dredging. J. Environ. Qual. __:__-__.
6. Schmidt, J.P., A.E. Dellinger, and D.B. Beegle. 2009. Nitrogen recommendations for corn: An on-the-go sensor compared to current recommendation methods. Agron. J. 101:916–924.
7. Dellinger, A.E., J.P. Schmidt, and D.B. Beegle. 2008. Developing nitrogen fertilizer recommendations for corn using an active sensor. Agron. J. 100:1546–1552.
8. Sripada, R.P., J.P. Schmidt, A.E. Dellinger, and D.B. Beegle. 2008. Evaluating multiple indices from a canopy reflectance sensor to estimate corn N requirements. Agron. J. 100:1553–1561.
9. Shigaki, F., P.J. Kleinman, J.P. Schmidt, A.N. Sharpley, and A.L. Allen. 2008. Impact of dredging on phosphorus transport in agricultural drainage ditches of the Atlantic Coastal Plain. J. Am. Water Res. Assoc. 44:1500–1511.
10. Sharpley, A.N., P.J.A. Kleinman, A.L. Heathwaite, W.J. Gburek, G.J. Folmar, and J.P. Schmidt. 2008. Phosphorus loss from an agricultural watershed as a function of storm size. J. Environ. Qual. 37:362–368.
11. Schmidt, J.P., and H. Lin. 2008. Water and Bromide recovery in wick and pan lysimeters under conventional and zero tillage. Comm. Soil Sci. Plant Anal. 39:108–123.
12. Strock, J.S., C.J. Dell, and J.P. Schmidt. 2007. Managing natural processes in drainage ditches for non-point nitrogen control. J. Soil Water Conserv. 62:188–196.
13. Vadas, P.A., M.S. Srinivasan, P.J.A. Kleinman, J.P. Schmidt, and A.L. Allen. 2007. Hydrology and groundwater nutrient concentration in a ditch-drained agro-ecosystem. J. Soil Water Conserv. 62:178–188.
14. Schmidt, J.P., C.J. Dell, P.A. Vadas, and A.L. Allen. 2007. Nitrogen export from Coastal Plain field ditches. J. Soil Water Conserv. 62:235–243.
15. Schmidt, J.P., N. Hong, A. Dellinger, D.B. Beegle, and H. Lin. 2007. Hillslope variability in corn response to nitrogen linked to in-season soil moisture redistribution. Agron. J. 99:229–237.
16. Schlossberg, M.J., and J.P. Schmidt. 2007. Nitrogen and trinexapac-ethyl treatment of putting greens cohabitated by ‘Penn A4’ Creeping Bentgrass and Annual Bluegrass. Agron. J. 99:99–106.
17. Loughin, T.M., M.P. Roediger, G.A. Milliken, and J.P. Schmidt. 2007. On the analysis of long-term experiments. J. R. Statist. Soc. A. 170:29–42.
18. Kleinman, P.J.A., M.S. Srinivasan, C.J. Dell, J.P. Schmidt, A.N. Sharpley, and R.B. Bryant. 2006. Role of rainfall, seasonal hydrology and landscape factors on phosphorus and nitrogen in surface runoff. J. Environ. Qual. 35:1248–1259.
19. Gehl, R.J., J.P. Schmidt, C.B. Godsey, L.D. Maddux, and W.B. Gordon. 2006. Post-harvest soil nitrate in irrigated corn: Variability among eight field sites and multiple N rates. Soil Sci. Soc. Am. J. 70:1922–1931.
20. Gehl, R.J., J.P. Schmidt, L.R. Stone, A.J. Schlegel, G.A. Clark. 2005. In Situ Measurements of Nitrate Leaching Implicate Poor Nitrogen and Irrigation Management on Sandy Soils. J. Environ. Qual. 34:2243–2254.
21. Gehl, R.J., J.P. Schmidt, L.D. Maddux, and W.B. Gordon. 2005. Corn yield response to nitrogen rate and timing in sandy irrigated Soils. Agron. J. 97:1230–1238.