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The Center for Agroforestry

Meet the UMCA Faculty and Staff

Ranjith Udawatta

Ranjith Udawatta, Ph.D.


Full Research Professor
Department of Soil, Environmental and Atmospheric Sciences

203 ABNR, SEAS
Columbia, MO 65211
(573) 882-4347
udawattar@missouri.edu

The primary objective of my research is to quantify environmental benefits of agroforestry. Currently, I am conducting research on influences of agroforestry and grass buffer on water and soil quality. In addressing this issue I am examining how trees and grass buffers change surface and subsurface water quality by reducing runoff, nutrients and sediment when intercropped in rowcrop agriculture. Changes in soil physical properties, soil water dynamics, competition for resources, root length density, nutrient accumulation, and microclimate are being evaluated in an agroforestry alley cropping practice. Soil carbon sequestration, cattle grazing impact on water quality, and prairie restoration are some of the areas in which I have conducted research. Recently, I used X-ray computed tomography to quantify soil porosity, distribution of pores, pore connectivity, and tortuosity as influenced by agroforestry and grass buffers.

Publications

  • Udawatta, R.P. and Jose, S. 2011. Carbon sequestration potential of North American agroforestry practices. In Kumar B., and Nair P.K.R. (eds.). Carbon Sequestration Potential of Agroforestry Systems: Opportunities and Challenges. Springer Science, The Netherlands.
  • Paudel, B.R., R.P. Udawatta, and S.H. Anderson. 2011. Agroforestry and grass buffer effects on soil quality parameters for grazed pasture and row-crop systems. Appl. Soil Ecol. 48: 125-132.
  • Wiley-Blackwell.Chu, B., K.W. Goyne, S.H. Anderson, C.H. Lin, and R.P. Udawatta. 2010. Veterinary antibiotic sorption to agroforestry buffer, grass buffer, and crop-land soils. Agroforestry Systems 79:67-80.
  • Kumar, S., R.P. Udawatta, and S.H. Anderson. 2010. Root length density and carbon content of agroforestry and grass buffers under grazed pasture systems in a Hapludalf. Agroforestry Systems 80:85-96.
  • Kumar, S., S.H. Anderson, R.P. Udawatta, and C.J. Gantzer. 2010. CT-measured macropores as affected by agroforestry and grass buffers for grazed pasture systems. Agroforesty Systems 79:59-65.
  • Liu, X., S.H. Anderson, and R.P. Udawatta. 2010. Measurement of solute transport properties using X-ray computed tomography. 20:405-412.
  • Liu, X., S.H. Anderson, and R.P. Udawatta. 2010. Macropore spatial variability of CT-measured solute transport parameters. 20:413-420.
  • Liu, X., S.H. Anderson, and R.P. Udawatta. 2010. Fractal dimension and lacunarity of CT-measured solute pore-water velocity and dispersivity. 20:421-428.
  • Udawatta, R.P., and L.D. Godsey. 2010. Agroforestry comes of age: Putting science into practice. Agroforesty Systems 79:1-4.
  • Udawatta, R.P., H.E. Garrett, and R.L. Kallenbach. 2010. Agroforestry and grass buffer effects on water quality in grazed pastures. Agroforestry Systems 79:81-87.
  • Kumar, S., S.H. Anderson, and R.P. Udawatta. 2010. Agro¬forestry and Grass Buffer Influences on Macropores Measured by Computed Tomography under Grazed Pasture Systems. Soil Science Society of America Journal 74:203-212.
  • Chu, B., K.W. Goyne, S.H. Anderson, C.H. Lin, and R.P. Udawatta. 2010. Veterinary antibiotic sorption to agroforestry buffer, grass buffer, and cropland soils. Agroforestry Systems 79:67-80.
  • Anderson, S.H., R.P. Udawatta, T. Seobi, and H.E. Garrett. 2009. Soil water content and infiltration in agroforestry buffer strips. Agrofor. Syst. 75:5-16.
  • Bailey, N.J., P.P. Motavalli, R.P. Udawatta, and K.O. Nelson. 2009. Soil CO2 emissions in agricultural watershed with agroforestry and grass contour buffer strips. Agrof. Syst. 77: 143-158.
  • Chu, B., K. Goyne, S.H. Anderson, R.P. Udawatta, and C.H. Lin. "Veterinary antibiotic sorption to agroforestry buffer, grass buffer and cropland soils." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 31-40.
  • Kumar, S., S.H. Anderson, R.P. Udawatta, and R.L. Kallenbach. "Agroforestry and grass buffer influences on water infiltration for a grazed pasture system." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 191-200.
  • Kumar, S., S.H. Anderson, and R.P. Udawatta. "CT-measured macropores as affected by agroforestry and grass buffers for grazed pasture systems." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 163-172.
  • Schultz, R.C., R.P. Udawatta, T.M. Isenhart, J.P. Colletti, and W.W. Simpkins. "Riparian and upland buffer practices." In Garrett, H.E. (ed.). 2009. North American Agroforestry: An Integrated Science and Practice. 2nd Edition. Agronomy Society of America, Madison, Wis. Chapter 8.
  • Udawatta, R.P., R.J. Kremer, H.E. Garrett, and S.H. Anderson. 2009. Soil enzyme activities and physical properties in a watershed managed under agroforestry and row-crop system. Agric. Ecosyst. Environ. 131:98-104.
  • Udawatta, R.P., H.E. Garrett, and R.L. Kallenbach. "Agroforestry and grass buffer effects on water quality on grazed pasture watersheds." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 173-182.
  • Udawatta, R.P., S.H. Anderson, P.P. Motavalli, and H.E. Garrett. "Agroforestry interactions and soil water use by corn-soybean watersheds." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 203-211.
  • Veum, K.S., K.W. Goyne, P.P. Motavalli, and R.P. Udawatta. 2009. Runoff and dissolved organic carbon loss from a paired-watershed study of three adjacent agricultural watersheds. Agr. Ecosyst. Environ. 130:115-122.
  • Yakimenko, E., S.H. Anderson, and R.P. Udawatta. 2009. Assessment of CT-measured porosity in Russian soils using fractal dimension and lacunarity. In C.H. Dagli, et al. (eds.) Proceedings of the Artificial Neural Networks in Engineering Conference. St. Louis, Mo. ASME Press, New York. 147-155.
  • Zeng, Y., C.J. Gantzer, S.H. Anderson, and R.P. Udawatta. 2009. Fractal analysis of CT-measured porosity for claypan soils. In C.H. Dagli, et al. (eds.) Proceedings of the Artificial Neural Networks in Engineering Conference. St. Louis, Mo. ASME Press, New York. 115-122.
  • Anderson, S.H., Z. Cheng, and R.P. Udawatta. 2008. Application of adaptive grayscale morphological operators for image analysis. Fractal analysis of CT-measured solute transport parameters. In C.H. Dagli et al. (eds.) Proceedings of the Artificial Neural Networks in Engineering Conference. St. Louis, MO. ASME Press, N.Y. 187-193.
  • Kumar, S., S.H. Anderson, L.G. Bricknell, and R.P. Udawatta. 2008. Soil hydraulic properties influenced by agroforestry and grass buffers for grazed pasture systems. J. Soil and water Conserv. 63: 224-232.
  • Motavalli, P.P., K.W. Goyne, and R.P. Udawatta. 2008. The environmental impacts of enhanced efficiency nitrogen fertilizers. Crop Management. DOI: 10:1094/CM-2008-0730-02-RV.
  • Myers, D.B., N.R. Kitchen, K.A. Sudduth, S. Grunwald, R.J. Miles, E.J. saddler, and R.P. Udawatta. 2008. Combining proximal and penetrating conductivity sensors for high resolution soil mapping. In: Proceedings of the first global workshop on high resolution digital soil sensing and mapping. Sydney, Australia. Feb. 2-4, 2008.
  • Udawatta, R.P., C.J. Gantzer, S.H. Anderson, and H.E. Garrett. 2008. Agroforestry and grass buffer effects on high resolution X-ray CT-measured pore characteristics. Soil Sci. Soc. Am. J. 72: 295-304.
  • Udawatta, R.P., and S.H. Anderson. 2008. CT-measured pore characteristics of surface and subsurface soils as influenced by agroforestry and grass buffers. Geoderma 145: 381-389.
  • Udawatta, R.P., R.J. Kremer, B.W. Adamson, and S.H. Anderson. 2008. Variations in soil aggregate stability and enzyme activities in a temperate agroforestry practice. Applied Soil Ecology 39: 153-160.
  • Udawatta, R.P., S.H. Anderson, C.J. Gantzer, and H.E. Garrett. 2008. Influence of prairie restoration on CT-measured soil pore characteristics. J. Environ. Qual. 37: 219-228.
  • Xiaobo L., S.H. Anderson, and R.P. Udawatta. 2008. X-ray computed tomography for measurement of fluid transport properties. In C.H. Dagli et al. (eds.) Proceedings of the Artificial Neural Networks in Engineering Conference. St. Louis, MO. ASME Press, N.Y. 139-146.
  • Xiaobo L., S.H. Anderson, and R.P. Udawatta. 2008. Spatial analysis of CT-measured solute pore water velocity and dispersivity. In C.H. Dagli et al. (eds.) Proceedings of the Artificial Neural Networks in Engineering Conference. St. Louis, MO. ASME Press, N.Y. 147-154.
  • Xiaobo L., S.H. Anderson, and R.P. Udawatta. 2008. Fractal analysis of CT-measured solute transport parameters. In C.H. Dagli et al. (eds.) Proceedings of the Artificial Neural Networks in Engineering Conference. St. Louis, MO. ASME Press, N.Y. 171-178.
  • Udawatta, R.P., N.I. Fox, P.P. Motavalli, and K.A. Nelson. 2007. Microclimate differences in agroforestry and grass buffers. pp 65-73. In A. Olivier and S. Campeau (ed.) Economic Opportunities and Environmental Benefits of Agroforestry. When Trees and Crops Get Together. The 10th North American Agroforestry Conference Proceedings, June 10-13, 2007, University Laval, Quebec City, Canada.
  • Udawatta, R.P., R.J. Kremer, H.E. Garrett, and S.H. Anderson. 2007. Soil aggregate stability and enzyme activity in agroforestry and row-cropping systems. pp 165-175. In A. Olivier and S. Campeau (ed.) Economic Opportunities and Environmental Benefits of Agroforestry When Trees and Crops Get Together. The 10th North American Agroforestry Conference Proceedings, June 10-13, 2007, University Laval, Quebec City, Canada.
  • Motavalli, P.P., R.P. Udawatta, K.W. Goyne, and K.A. Nelson. 2006. Environmental issues related to nitrogen management practices in the United States. pp. 59-84. In C.H. Kim (ed.) Proceedings of the International Symposium on Nitrogen Behavior and Effective Management in Agro-Ecosystem, Sept. 21, 2006. Official Record Number 11-1390093-000137-01. National Institute of Agricultural Science and Technology, Rural Development Administration, Republic of Korea.
  • Udawatta, R.P., S.H. Anderson, C.J. Gantzer, and H.E. Garrett. 2006. Agroforestry and grass buffer influence on macropore characteristics: a computed tomography analysis. Soil Sci. Soc. Am. J. 70: 1763-1773.
  • Udawatta, R.P., G.S. Henderson, J.R. Jones, and R.D. Hammer. 2006. Runoff and sediment from row-crop, row-crop with grass strips, pasture, and forested watersheds. J. Water Sciences 19: 137-149.
  • Udawatta, R.P., P.P. Motavalli, H.E. Garrett, and J.J. Krstansky. 2006. Nitrogen and nitrate losses in runoff from three adjacent corn-soybean watersheds. Agriculture, Ecosystems & Environment 117: 39-48.
  • Anderson, S.H., R.P. Udawatta, T. Seobi, and H.E. Garrett. 2005. Soil water content and infiltration in agroforestry buffer strips. pp. 1-17. In K.N. Brooks and P.F. Ffolliott (ed.) Moving agroforestry into the mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, Minnesota. Dept. of Forest Resources, University of Minnesota, St. Paul, MN. [non-paginated CD-ROM]
  • Bailey, N., P.P. Motavalli, R.P. Udawatta, and K. Nelson. 2005. Effects of landscape position and temperate alley cropping practices on soil carbon dioxide and nitrous oxide flux in an agricultural watershed. pp. 1-14. In K.N. Brooks and P.F. Ffolliott (ed.) Moving agroforestry into the mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, Minnesota. Dept. of Forest Resources, University of Minnesota, St. Paul, MN. [non-paginated CD-ROM]
  • Lin, C.H., R.N. Lerch, R.J. Kremer, H.E. Garrett, R.P. Udawatta, and M.F. George. 2005. Soil microbiological activities in vegetative buffer strips and their association with herbicide degradation. pp. 1-10. In K.N. Brooks and P.F. Ffolliott (ed.) Moving agroforestry into the mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, Minnesota. Dept. of Forest Resources, University of Minnesota, St. Paul, MN. [non-paginated CD-ROM]
  • Seobi, T., S.H. Anderson, R.P. Udawatta, and C.J. Gantzer. 2005. Influences of grass and agroforestry buffer strips on soil hydraulic properties. Soil Sci. Soc. Am. J. 69: 893-901.
  • Udawatta, R.P., P.O. Nygren, and H.E. Garrett. 2005. Growth of three oak species during establishment in an agroforestry practice for watershed protection. Can. J. For. Res. 35: 602-609.
  • Udawatta, R.P., S.H. Anderson, and H.E. Garrett. 2005. Tree, grass, and crop root length densities and soil water content within an agroforestry buffer system. pp. 1-16. In K.N. Brooks and P.F. Ffolliott (ed.) Moving agroforestry into the mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, Minnesota. Dept. of Forest Resources, University of Minnesota, St. Paul, MN. [non-paginated CD-ROM]
  • Udawatta, R.P., P.P. Motavalli, and H.E. Garrett. 2004. Phosphorus loss and runoff characteristics in three adjacent agricultural watersheds with claypan soils. J. Environ. Qual. 33: 1709-1719.
  • Udawatta, R.P. and G.S. Henderson. 2003. Root distribution relationships to soil properties in Missouri Oak Stands: A productivity index approach. Soil Sci. Soc. Am. J. 67: 1869-1878.
  • Udawatta, R.P., J.J. Krstansky, G.S. Henderson, and H.E. Garrett. 2002. Agroforestry practices, runoff, and nutrient loss: A paired watershed comparison. J. Environ. Qual. 31: 1214-1225.
  • Hammer, R.D, G.S. Henderson, R.P. Udawatta, and D. Brandt. 1995. Soil organic carbon in Missouri Forest-prairie ecotone In: J. M. Kelly and W.W. McFee, Ed. Carbon Forms and Functions in Forest Soils. Proceedings of 8th North American Forest Soils Conference, May 9-13, 1993, Gainesville, Florida. Soil Science Society of America, Inc., Madison, Wisconsin, USA. 201-231.

Abstracts

  • Udawatta, R.P., H.E. Garrett, and B. Adamson. 2008. Variations in dissolved soil nutrients in a temperate agroforestry watershed. Agronomy Abstracts 2008. Annual Meetings. Houston, Texas, Oct. 5-9, 2008. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., R.J. Kremer, P.P. Motavalli, S.H. Anderson, and H.E. Garrett. 2008. Variation in soil enzyme activities in a temperate agroforestry watershed. Agronomy Abstracts 2008. Annual Meetings. Houston, Texas, Oct. 5-9, 2008. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Kumar, S., S.H. Anderson, and R.P. Udawatta. 2008. Agroforestry and Grass Buffer Influences on CT-Measured Macropores under Grazed Pasture Systems. Agronomy Abstracts 2008. Annual Meetings. Houston, Texas, Oct. 5-9, 2008. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Veum, K., K.W. Goyne, P.P. Motavalli, R.P. Udawatta, and H.E. Garrett. 2008. Buffer effects on runoff and dissolved organic carbon loss in a corn-soybean rotation using a paired watershed approach. Agronomy Abstracts 2008. Annual Meetings. Houston, Texas, Oct. 5-9, 2008. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Chu, B., K.W. Goyne, S.H. Anderson, R.P. Udawatta, and C.H. Lin. 2008. Veterinary antibiotic sorption to agroforestry buffers, grass buffer, and cropland soils. Agronomy Abstracts 2008. Annual Meetings. Houston, Texas, Oct. 5-9, 2008. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Kumar, S., S.H. Anderson, and Udawatta. 2008. Influence of Agroforestry and Grass Buffers on Infiltration for a Grazed Pasture System. Agronomy Abstracts 2008. Annual Meetings. Houston, Texas, Oct. 5-9, 2008. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., C.J. Gantzer, S.H. Anderson, and S. Assouline. 2008. Synchrotron X-ray computed microtomography of soil pore characteristics affected by compaction. European Geoscience Union General Assembly 2008. Austria Center Vienna, Vienna. April 13-18, 2008. Vienna, Austria.
  • Anderson, S.H., R.P. Udawatta, and C.J. Gantzer. 2008. Pore characteristics measured by high resolution X-ray computed tomography for agroforestry and grass buffers. European Geoscience Union General Assembly 2008. Austria Center Vienna, Vienna. April 13-18, 2008. Vienna, Austria.
  • Udawatta, R.P., R.J. Kremer, S.H. Anderson, and H.E. Garrett. 2007. Soil aggregate stability and enzyme activity in agroforestry and row-cropping systems. Economic Opportunities and Environmental Benefits of Agroforestry. The 10th North American Agroforestry Conference, June 10-13, 2007, Université Laval, Québec City, Canada.
  • Udawatta, R.P., N.I. Fox, P.P. Motavalli, and K.A. Nelson. 2007. Microclimate differences in agroforestry and grass buffers. Economic Opportunities and Environmental Benefits of Agroforestry. The 10th North American Agroforestry Conference, June 10-13, 2007, Université Laval, Québec City, Canada.
  • Kumar, S., S.H. Anderson, L. Bricknell, and R.P. Udawatta. 2007. Animal traffic effects on soil hydraulic properties relative to agroforestry and grass buffers. Agronomy Abstracts 2007. Annual Meetings. New Orleans, Louisiana, Nov. 4-8, 2007. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., S.H. Anderson, P.P. Motavalli, and H.E. Garrett. 2007. Soil water dynamics under agroforestry and grass buffers. Agronomy Abstracts 2007. Annual Meetings. New Orleans, Louisiana, Nov. 4-8, 2007. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., N.I. Fox, P.P. Motavalli, and K. Nelson. 2007. Agroforestry and grass buffer effects on microclimate of a corn-soybean rotation. Agronomy Abstracts 2007. Annual Meetings. New Orleans, Louisiana, Nov. 4-8, 2007. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Bei, C., K.W. Goyne, S.H. Anderson, R.P. Udawatta, and L. Chung-Ho. 2007. Veterinary antibiotic sorption to agroforestry buffer, grass buffer and cropland soils. Agronomy Abstracts 2007. Annual Meetings. New Orleans, Louisiana, Nov. 4-8, 2007. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Gantzer, C.J., S.H. Anderson, R.P. Udawatta, and A.R.O. Shmuel. 2007. Discriminating power of 3-Dimensional micrometer-scale pore parameters to assess compaction of a Hamra soil. X-ray Computed Tomography of Soil. Aug. 19-22, 2007, University of Guelph, Guelph, Canada.
  • Bricknell, L., S.H. Anderson, S. Kumar, and R.P. Udawatta. 2007. Animal traffic effects on soil hydraulic properties relative to agroforestry and grass buffers. Missouri Natural Resources Conference. Jan. 31- Feb. 2, 2007, Tan-Tar-A Resort, Osage Beach, Missouri.
  • Udawatta, R.P., S.H. Anderson, C. J. Gantzer, and H.E. Garrett. 2006. Computed tomographic characterization of soil pores as influenced by restoration of prairie ecosystems. Agronomy Abstracts 2006. Annual Meetings. Indianapolis, Indiana, Nov. 12-16, 2006. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., C.J. Gantzer, and S.H. Anderson. 2006. High resolution scanning for evaluation of agroforestry and grass buffer effects on pore characteristics. Agronomy Abstracts 2006. Annual Meetings. Indianapolis, Indiana, Nov. 12-16, 2006. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., C.J. Gantzer, and S.H. Anderson. 2006. Agroforestry and grass buffer effects on computed tomography-evaluated pore characteristics. Agronomy Abstracts 2006. Annual Meetings. Indianapolis, Indiana, Nov. 12-16, 2006. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., S.H. Anderson, and C.J. Gantzer. 2006. Agroforestry and grass buffer influences on CT-measured pore characteristics. 18th World Congress of Soil Science, Philadelphia, PA. July 9-15, 2006. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 363.
  • Motavalli, P.P., N.J. Bailey, R.P. Udawatta, and K. Nelson. 2006. Soil carbon dioxide and nitrous oxide efflux in agricultural watersheds with agroforestry and grass contour buffer strips. 18th World Congress of Soil Science, Philadelphia, PA. July 9-15, 2006. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Anderson, S.H., A. Rachman, C.J. Gantzer, and R.P. Udawatta. 2006. Computed-tomography for measurement of soil macroporosity as affected by stiff-stemmed grass hedges. 18th World Congress of Soil Science, Philadelphia, PA. July 9-15, 2006. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 361.
  • Birk, K.J., R.P. Udawatta, A.R. Lupo, J.A. Lory, and P.P. Motavalli. 2006. The impact of climate and interannual variability on surface runoff and agricultural decision making. Agronomy Abstracts 2006. Annual Meetings. Indianapolis, Indiana, Nov. 12-16, 2006. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., S.H. Anderson, P.P. Motavalli, and H.E. Garrett, 2005. Calibration of reflectrometer sensors for claypan soils. Agronomy Abstracts 2005. Annual Meetings. Salt Lake City, Utah, Nov. 6-10, 2005. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., H.E. Garrett, and S.H. Anderson. 2005. Agroforestry practices improve water quality: a paired watershed comparison. Agronomy Abstracts 2005. Annual Meetings. Salt Lake City, Utah, Nov. 6-10, 2005. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Lin, C.H., R.N. Lerch, R.J. Kremer, H.E. Garrett, R.P. Udawatta, and M.F. George. 2005. Soil microbiological activities in vegetative buffer strips and their association with herbicide degradation. Agronomy Abstracts 2005. Annual Meetings. Salt Lake City, Utah, Nov. 6-10, 2005. American Society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., S.H. Anderson, C.J. Gantzer, and T. Seobi. 2004. Agroforestry and grass buffer effects on CT-measured macropore characteristics. Agronomy Abstracts 2004. Annual Meetings. Seattle, Washington, Oct. 31-Nov. 4, 2004. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., P.P. Motavalli, and H.E. Garrett. 2004. Total nitrogen and nitrate loss in runoff from three adjacent row-cropped watersheds. Agronomy Abstracts 2004. Annual Meetings. Seattle, Washington, Oct. 31-Nov. 4, 2004. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Bailey, N.J., P.P. Motavalli, R.P. Udawatta, and K.A. Nelson. 2004. Soil C and N distribution and gaseous flux due to landscape position and temperate alley cropping practices in an agricultural watershed. Agronomy Abstracts 2004. Annual Meetings. Seattle, Washington, Oct. 31-Nov. 4, 2004. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., P. Nygren, and H.E. Garrett. 2004. Interfacial root densities and soil moisture in a soybean alley cropping practice. First World Congress of Agroforestry. Orlando, Florida, June 27 to July 02, 2004. University of Florida, Gainesvilles, FL 32611.
  • Udawatta, R.P., P.P. Motavalli, and H.E. Garrett. 2003. Phosphorus loss and runoff characteristics: paired agricultural watersheds in a claypan soil. Agronomy Abstracts 2003. Annual Meetings. Denver Colorado, Nov. 2-6, 2003. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Seobi, T., S.H. Anderson, R.P. Udawatta, and C.J. Gantzer. 2003. Influences of agroforestry buffer strips on soil hydraulic properties and infiltration. Agronomy Abstracts 2003. Annual Meetings. Denver Colorado, Nov. 2-6, 2003. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., R.D. Hammer, and H.E. Garrett. 2002. Soil carbon sequestration in an agroforestry alley cropping practice. Agronomy Abstracts 2002. Annual Meetings. Indianapolis, Indiana, Nov. 10-14, 2002. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Farrand, D.T., R.P. Udawatta, and H.E. Garrett. 2002. Predicting environmental benefits of agroforestry practices in northern Missouri using APEX. Agronomy Abstracts 2002. Annual Meetings. Indianapolis, Indiana, Nov. 10-14, 2002. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711.
  • Udawatta, R.P., P.O. Nygren, and H.E. Garrett. 2002. Growth of three oak species during establishment in an agroforestry practice for watershed protection. In Sharrow, S. H. (ed.) Agroforestry and Riparian buffers for Land Productivity and Environmental Stability. The 8th North American Agroforestry Conference Proceedings, June 23-25, 2003, Dept. Rangeland Resources, Oregon State University, Corvallis, OR, USA.
  • Udawatta, R.P., J.J. Krstansky, G.S. Henderson, and H.E. Garrett. 2001. Agroforestry effects on NPS pollution control. Agronomy Abstracts 2001, Annual Meetings. Charlotte, NC. Oct. 21 - 26, 2001. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 345.
  • Udawatta, R.P., G.S. Henderson, R.D. Hammer, and J.R. Jones.1999. Riparian forested buffers and grass filter strips effectively reduce sediment, nutrient loss, and runoff from non point source agricultural watersheds. Agronomy Abstracts 1997, Annual Meetings. Salt Lake City, Utah. Oct. 31 - Nov. 4, 1999. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 335.
  • Udawatta, R.P., R.D. Hammer, G.S. Henderson, J.R. Jones. 1997. Variable source area management to improve water quality. Agronomy Abstracts 1997, Annual Meetings. Anaheim, California, Oct. 26-31,1997. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 313.
  • Udawatta, R.P., R.D. Hammer, G.S. Henderson, J.J. Krstansky, and R. Jenson. 1996. Spatial and temporal variation of oak foliage nutrients in southeast Missouri. Agronomy Abstracts 1996, Annual Meetings. Indianapolis, Indiana, Nov. 3-8, 1996. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 298.
  • Hammer, R.D., R.P. Udawatta, and D. Meinert. 1996. The soil resource: its relevance to the long term objectives of the Missouri Ozark Forest Ecosystem Project. Missouri Forest, Fish, and Wildlife Conference, Jan. 31 - Feb. 2, 1996.
  • Udawatta, R.P., and R.D. Hammer. 1995. Variation in soil organic carbon due to surface shape and topography in forested watersheds. Agronomy Abstracts 1995, Annual Meetings. St. Louis, Missouri, Oct. 29 - Nov. 3, 1995. American society of Agronomy, 677, South Segoe Road, Madison, Wisconsin 53711. pp 307.

Extension Outreach Publications and Presentations:

  • Ranjith Udawatta and Harold Garrett. 2008. Subsurface nutrient loss from a corn-soybean watershed with agroforestry and grass buffers. In 2008 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Michael Gold and Ranjith Udawatta. 2007. Conservation buffers and pollution reduction. Water Quality Short Course. Boone County Extension Office, Columbia, MO. April 10-12, 2007.
  • Ranjith P. Udawatta, Neil I. Fox, Peter P. Motavalli, and Kelly A. Nelson. 2007. Agroforestry and grass buffer influences on microclimate. In 2007 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Ranjith P. Udawatta, Robert J. Kremer, Harold E. Garrett, and Stephen H. Anderson. 2007. Soil aggregate stability and enzyme activity in agroforestry and row-cropping system. In 2007 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri
  • Ranjith Udawatta, Stephen Anderson, Clark Gantzer, and Allen Thompson. 2006. Streambank stabilization. MALMRI Directors Meeting August 4, 2006, MDNR Building, Jefferson City.
  • Ranjith P. Udawatta, Stephen H. Anderson, and Harold E. Garrett. 2006. Soil pore characteristics, hydraulic conductivity and soil bulk density as influenced by agroforestry and grass buffer conservation practices. In 2006 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Ranjith P. Udawatta. 2006. Agroforestry and grass buffer influences on water quality and soil water. Soil, Environmental and Atmospheric Sciences Departmental Seminar, Winter Semester 2006.
  • Ranjith P. Udawatta, Stephen H. Anderson, and Harold E. Garrett. 2005. Influence of agroforestry buffers on root length density and soil water content. In 2005 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Ranjith P. Udawatta, Harold E. Garrett, and Pekka O. Nygren. 2004. Root distribution in an agroforestry alley cropping practice. In 2004 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Ranjith P. Udawatta, Stephen H. Anderson, Tshepiso Seobi, and Harold E. Garrett. 2004. Influence of agroforestry buffer strips on soil water. In 2004 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Garrett, "Gene" and Ranjith Udawatta. 2003. Agroforestry benefits environment and land owners. In 2003 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Garrett, "Gene" and Ranjith Udawatta. 2002. Agroforestry practices reduce runoff and nutrient loss: A paired watershed comparison. In 2002 Novelty Field Day Report. Outreach and Extension, Univ. of Missouri-Columbia, Missouri and Lincoln University, Jefferson City, Missouri.
  • Henderson, G.S., J.R. Jones, R.D. Hammer, R.P. Udawatta, and S.J. Schmitt. 2001. Improving water quality through application of high resolution remote sensing, GPS and modeling in the design of best management plans. School of Natural Resources, University of Missouri, Columbia, MO65211.
  • Ranjith Udawatta, Gray Henderson, David Hammer, Jack Jones. 1998. Riparian corridor condition and hydrologically sensitive area management to improve water quality. In Riparian Review. Missouri Department of Conservation, Fish and Wildlife Research Center, 1110 S. College Avenue, Columbia, MO 65201.
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