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Department of Agronomy

Other Publications

Proceeding papers/Published abstracts/Presentations (Recent)

2017

Alasmary, Z., G.M. Hettiarachchi, K. L. Roozeboom, L.C. Davis,  L.E. Erickson, V. Pidlisnyuk, T. Stefanovska, A. Nurzanova, and J. Trogl. 2017. Field-based investigations on stabilization of a contaminated military site via combined use of soil amendments and biofuel crop growth. ASA/SSSA/CSA Annual Meetings, Oct. 2017, Tampa, FL.

Almutari, M., G.M. Hettiarachchi, S. Hutchinson, E. Schmitz, M. B. Kirkham, L. Erickson. 2017. Soil- and Plant-based Treatment Options for Marginal Waters. ASA/SSSA/CSA Annual Meetings, Oct. 2017, Tampa, FL.

Hettiarachchi, G.M., C.P. Attanayake, P. Defoe, S. Martin, and G.M. Pierzynski. 2017. Food Safety in Pb-Enriched Garden Soils.ASA/SSSA/CSA Annual Meetings, Oct. 2017, Tampa, FL.

Weeks, J.J. and G. M. Hettiarachchi. 2017. Fixing phosphorus: Considering cation complexing co-applicants to maintain phosphorus lability in an acid soil. ASA/SSSA/CSA Annual Meetings, Oct. 2017, Tampa, FL.

Weeks, J.J. and G. M. Hettiarachchi. 2017. In Search of a solution to pollution: Improving phosphorus fertilizer use efficiency through simple formulation alterations. ASA/SSSA/CSA Annual Meetings, Oct. 2017, Tampa, FL.

Galinskaya, K., S. Williams, J. Wang, G.M. Hettiarachchi, P. Kempton, S. Vero, S. Datta. 2017. Geospatial Analysis of Risk Components for Elevated Blood Lead Levels: Geologic and Anthropogenic Factors. Geological Society of America Meeting, Seattle, WA, Oct. 2017.

Hettiarachchi, G.M. Z. Almasary, K. L. Roozeboom, L.C. Davis,  L.E. Erickson, V. Pidlisnyuk, T. Stefanovska, A. Nurzanova, and J. Trogl. 2017. Field-based investigations on phytostabilization of a contaminated military site using biofuel crop growth assisted with soil amendments. International Phytotechnolgy Conference, Sep. 2017, Montreal, Canada.

Pidlisnyuk V., Stefanovska T., Erickson L., Hettiarachichi G., Davis L., Shapoval P., Nurzhanova A. Using Miscantus x giganteus for restoration of former military sites.14th International Phytotehnologies Conference. Phytotechnologies: new sustainable solution for environmental challenges, IPC 2017, September 25-29, 2017, Montreal, Canada.

Pidlisnyuk V. ,Trogl J., Stefanovska T., Shapoval P., Nurzhanova A., Erickson L., Davis L., Hettiarachchi G. Phytotechnology with Miscanthus x giganteus biomass production for sustainable management of military sites. RemTech Europe conference on remediation market and technologies, Ferrara, Italy, September 20-22, 2017

Hettiarachchi, G.M., M.B. Galkaduwa, G. Kluitenberg, and S. Hutchinson. 2017. Poorly crystalline iron oxide minimize arsenic mobility in a water-saturated soil column system designed for FGD wastewater treatment. International Conference on Biogeochemistry of Trace elements. July 2017, Zurich, Switzerland. 

Erickson L., Pidlisnyuk V., Trögl J., Shapoval P., Popelka J., Davis L., Stefanovska T., Hettiarachchi G. Perennial phytotechnology with biomass production for abandoned military site in Sliač, Slovakia. International conference on Chemical technology and engineering, Lviv, Ukraine, June 26-30, 2017.

Davis L. C., Alasmary Z., Erickson L. E., Hettiarachchi G., Nurzanova A., Pidlisnyuk V., Roozeboom K., Stefanovska T., Trogl J. Using a second generation biofuel crop for phytostabilization of contaminated military lands. 17 Annual Meeting of the American Ecological Engineering Society, "Ecological engineering for adaptation in the Anthropocene", May 23-25, 2017, UGA, Athens, Georgia.

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2016

Weeks, J.J. and G. M. Hettiarachchi. 2016. Fixing Phosphorus: Considering Cation Complexing Co-Applicants to Maintain Phosphorus Lability in Calcareous Soils. ASA/SSSA/CSA Annual Meetings, Nov. 2016, Phoenix, AZ.

Hsiao, C-J, G.F. Sassenrath, C. W. Rice, L.H. Zeglin and G. M. Hettiarachchi. 2016. Soil Microbial Communities in Claypan Soils. ASA/SSSA/CSA Annual Meetings, Nov. 2016, Phoenix, AZ.

Alghamdi, A., M.B. Kirkham, D.R. Presley, G.M. Hettiarachchi and B. Paul.2016. Heavy Metal Uptake from Abandoned Mine Waste Materials Amended with Biosolids. ASA/SSSA/CSA Annual Meetings, Nov. 2016, Phoenix, AZ.

Alghamdi, A., M.B. Kirkham, D.R. Presley, G.M. Hettiarachchi, and L. Murray. 2016. Mine Site Rehabilitation with Biosolids for Sustainable Development. ASABE Annual International Meeting. 17-20 July, Orlando, Florida.

Hettiarachchi, G.M. and J. Pierzynski. 2016. Does liquid P fertilizer excel in the U.S. calcareous soils? Great Plains Soil Fertility Conference, March 2016, Denver, CO.

Vega, M., H. Kulkarni, S. Barua. N, Kumar, K. Johannesson, G.M. Hettiarachchi, P. Bhattacharya, P. Kempton, and S. Datta. 2016. Linking geochemistry and dissolved organic matter quality to Mn and As release in groundwater, Murshidabad, West Bengal, India. January 2016, GSA Annual Meeting in Denver, CO.

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2015

Menefee, D., P. Pitumpe Arachchige, G.M. Hettiarachchi, and C.W. Rice. 2015. The effects of temperature, moisture, and management on soil microbial properties in two different soils. ASA/SSSA/CSA Annual Meetings, Nov. 2015, Minneapolis, MN.

Weeks, J. and G.M. Hettiarachchi. 2015. Taking the next step: Exploration of naturally produced, organic compounds to alter the mobility and lability of soil elements. ASA/SSSA/CSA Annual Meetings, Nov. 2015, Minneapolis, MN.

Hsiao, C-J., G.  F. Sassenrath, C. W. Rice, L. H. Zeglin, G. M. Hettiarachchi, D. R. Presley. 2015. Soil microbial activity with depth in claypan soils of Southeast Kansas. ASA/SSSA/CSA Annual Meetings, Nov. 2015, Minneapolis, MN.

Alghamdi, A., D.R. Presley, M. B. Kirkham, G.M. Hettiarachchi, and B. Paul. 2015. Soil physical properties at an abandoned mine in central USA. ASA/SSSA/CSA Annual Meetings, Nov. 2015, Minneapolis, MN.

Hettiarachchi, G.M. P. Pitumpe Arachchige, L. Maurmann, D. Menefee, C. W. Rice, C. Karunakaran, J. Dynes and T. Regier. 2015. Understanding of coupled physicochemical mechanisms controlling soil carbon storage and stabilization. ASA/SSSA/CSA Annual Meetings, Nov. 2015, Minneapolis, MN.

Hettiarachchi, G.M. 2015. Embedding soils in the general education undergraduate curriculum.ASA/SSSA/CSA Annual Meetings, Nov. 2015, Minneapolis, MN.

Hettiarachchi, G.M. and S. Martin. 2015. Growing safely to produce healthy crops- community gardens on previously used sites. American Community Gardening Association, August 15, Denver, CO.

Hettiarachchi, G.M., C. P. Attanayake, P. Defoe, and S. Martin. 2015.  Managing urban garden soils: Minimize potential for soil contaminant transfer. The 100th Annual Meeting of Ecological Society of America, Aug. 2015. Baltimore, MD.

Hettiarachchi, G.M., C. Attanayake, P. Defoe, and S. martin. 2015. Gardening on contaminated urban soils: Mechanisms to reduce risk potential.  The 12th International Phytotechnologies Conference, Sep. 2015, Manhattan, KS.

Pitumpe Arachchige, P., G.M. Hettiarachchi, C. W. Rice, and L. Maurmann. 2015. Effect of long term agricultural management practices on soil carbon sequestration: Bulk-NEXAFS and 13C NMR studies. The 12th International Phytotechnologies Conference, Sep. 2015, Manhattan, KS.

Menefee, D., P. Pitumpe Arachchige, G.M. Hettiarachchi, and C. W. Rice. 2015. The effects of temperature, moisture, and management on soil microbial properties in two different soils. The 12th International Phytotechnologies Conference, Sep. 2015, Manhattan, KS.

Weeks, J., G.M. Hettiarachchi, E. Santos, and J. Tatarko. 2015. An assessment of the trace element exposure risk to urban brownfields gardeners via inhalation. The 12th International Phytotechnologies Conference, Sep. 2015, Manhattan, KS.

Galkaduwa, M. B., G. M. Hettiarachchi, A.T. Marshall, and G. J. Kluitenberg. 2015. Understanding of trace elements retention by sulfate reduction in a pilot-scale constructed wetland treatment system designed for FGD wastewater. The 12th International Phytotechnologies Conference, Sep. 2015, Manhattan, KS.

Mengarelli, J., M. B. Galkaduwa, L. C. Davis, G. Hettiarachchi. 2015. Boron uptake is regulated in sunflowers. The 12th International Phytotechnologies Conference, Sep. 2015, Manhattan, KS.

Chayapan, P., V. Gudichuttu, G.M. Pierzynski, G.M. Hettiarachchi, and L.R. Baker. 2015. Long-term effects of compost additions to chemical and biological properties of metal-contaminated soils.  The 13th International Conference on Biogeochemistry of Trace Elements. July 2015, Fukushima, Japan.

Hettiarachchi, G.M. 2015. Promising opportunities to use biosolids in revitalizing urban brownfields.  International Water Association/Water Environment Federation/ Residuals and Biosolids Conference. June 2015. Washington, DC.

Webinars

Hettiarachchi, G.M. and S. Martin. December 2015. Gardening on Brownfields - Research Results and Best Management Practices. One-hour Webinar organized as a part of EPAs Brownfields National Training Webinar Series.

Hettiarachchi, G.M. April 2015. Urban Vegetable Gardening. One-hour Webinar organized by the Agency for Toxic Substances and Disease Registry (ATSDR), as part of monthly webinar series

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2014

Hettiarachchi, G.M., C. Attanayake, P. Defoe, S. Martin, and G. M. Pierzynski. 2014. Minimizing human exposure to contaminants in urban soils. ASA/SSSA/CSA Annual Meetings, Nov. 2014, Long Beach, CA.

Hettiarachchi, G.M., C. Attanayake, P. Defoe, and S. Martin. 2014. Growing food crops on urban soils. ASA/SSSA/CSA Annual Meetings, Nov. 2014, Long Beach, CA.

Weeks, J., G.M. Hettiarachchi, E. Santos, and J. Tatarko. 2014. Assessment of potential human inhalation exposure to soil trace elements resulting from agricultural activity on urban brownfield sites. ASA/SSSA/CSA Annual Meetings, Nov. 2013, Long Beach, CA.

Galkaduwa, M. B., G.M. Hettiarachchi, G. Kluitenberg, and S. Hutchinson. 2014. Minimizing arsenic mobility using ferrihydrite in a small-scale constructed wetland treatment system designed for removal of selenium in FGD wastewater. ASA/SSSA/CSA Annual Meetings, Nov. 2014, Long Beach, CA.

Pitumpe Arachchige, P., G.M. Hettiarachchi, L. Maurmann, C.W. Rice, J. Dynes and T. Regier. 2014. Characterization of organic carbon in soil aggregates from temperate continuous corn system with contrasting management practices using NEXAFS and 13C-NMR spectroscopy. ASA/SSSA/CSA Annual Meetings, Nov. 2014, Long Beach, CA.

Pierzynski, J., G.M. Hettiarachchi, and J. Blair. 2014. Soil phosphorus cycling in a non-agricultural grassland ecosystem: Influence of fertilization. ASA/SSSA/CSA Annual Meetings, Nov. 2014, Long Beach, CA.

Datta, S., A.W. Krehel, A. Bednar, G. Hettiarachchi, M.M. Rahman, S. Sankar, C. Attanayake, and L. Johannesson, 2014. Sorption mechanisms of arsenic within aquifer sediments, and bioaccumulation of As in rice from West Bengal, India. Goldschmidt Conference. Sacramento, CA.

Krehel, A.W., A. Bednar, M. Vega, K. Pandiya, M.M. Rahman, G. Hettiarachchi., R. Tappero, K. Johannesson, and S. Datta. Sorption of arsenic within aquifer sediment and processes of bioaccumulation and localization of arsenic within rice grown in the sediment from Bangladesh and India. Oct. 2014, GSA Annual Meeting, Vancouver, BC.

Galkaduwa, M.B., J. Peredez, N. Mladenov, G. M. Hettiarachchi., G. Kluitenberg, and S. Hutchinson.  Arsenic mobilization in the treatment of flue gas desulfurization using constructed wetland treatment systems.  Sept. 2014, Electrical Power Affiliate Program Meeting, Manhattan, KS.

Karna, R., G. M. Hettiarachchi. 2014.  Mechanistic understanding of biogeochemical transformations of trace elements in contaminated minewaste materials under reduced conditions. U.S. EPA National Conference on Mining-Influenced Waters. Aug. 2014, Albuquerque, NM.

Weeks, J. and G.M. Hettiarachchi. 2014. Increased urban agriculture in the United States – A breath of fresh air? The Soils in the City Mini-Conference. June 30-July 2, Chicago, IL.

Hettiarachchi, G.M. 2014. Managing urban pollutants to minimize human exposure. The Soils in the City Mini-Conference. June 30-July 2, Chicago, IL.

Datta, S., K. Johannesson, N. Mladenov, M.S. Sankar, S. Ford, M. Vega, A.W. Neal, M.G. Kibria, A. Krehel, G.M. Hettiarachchi. 2014. Groundwater-sediment sorption mechanisms and role of organic matter in controlling arsenic release into aquifer sediments of Murshidabad area (Bengal basin), India: Proceedings of the 5th International Congress on Arsenic in the Environment, May 11-16, 2014, Buenos Aires, Argentina.

Martin, S. and G. M. Hettiarachchi. 2014. Risky Business? Growing crops on brownfields. The Ohio Brownfields Conference, 24 April 2014, Columbus, OH.

Hettiarachchi, G.M., J. Pierzynski, and R. Khatiwada. 2014. Mobility, availability and reaction products of different phosphorus fertilizer sources in high P-fixing soil types.  March 2014, Great Plains Soil Fertility Conference, Denver, CO.

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2013

Martin, S. and G.M. Hettiarachchi. 2013.  Community gardens on brownfields –Should you be scared? Society of Environmental Chemistry and Toxicology North America 34th Annual Meeting.  November 2013, Nashville, TN.

Hettiarachchi, G.M., C. Attanayake, P. Defoe, S. Martin, and G. M. Pierzynski. 2013. Contaminant transfer from urban garden soils to plants-Do we need to worry? ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Galkaduwa, B., G.M. Hettiarachchi, G. Kluitenberg, and S. Hutchinson. 2013. Sequestration of selenium in flue gas desulfurization wastewater using constructed wetlands: A synchrotron based investigation. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Attanayake, C., G.M. Hettiarachchi, D. Van der Merwe, and G.M. Pierzynski. 2013. Transfer of polycyclic aromatic hydrocarbons from urban soils to humans via dermal absorption. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Defoe, P., G. M. Hettiarachchi and C. Benedict.  2013. Reducing Bioaccessibility of Lead and Arsenic in a Contaminated Urban Garden Soil. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Pitumpe Arachchige, P., G.M. Hettiarachchi, L. Maurmann, D. Menefee, C.W. Rice and T. Amado. 2013.  Effects of Agricultural Management Practices on carbon sequestration in soils from two different agroecosystems: Understanding the contribution of soil organic carbon protection mechanisms. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Pitumpe Arachchige, P., G.M. Hettiarachchi, C. Attanayake, and C.W. Rice. 2013.  STXM-NEXAFS Spectromicroscopy Studies of Intact Soil Microaggregates from a Tropical Agroecosystem. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Pierzynski, J., and G.M. Hettiarachchi. 2013. Effects of Phosphorus Source on Fate and Transformation of Phosphorus in High P-Fixing soils. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Weeks, J. and G.M. Hettiarachchi. 2013. Assessing Soil Preparation Techniques to Improve Portable XRF Precision and Recovery Efficiency of Lead in Urban Soils As Compared to the EPA 3051 Total Soil Digestion Method. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Menefee, D., P. Pitumpe Arachchige, G.M. Hettiarachchi, C.W. Rice, and T.J.C. Amado. 2013. Mechanisms of soil carbon protection in a Tropical Agroecosystem under Differing Management Practices. ASA/SSSA/CSA Annual Meetings, Oct. 2013, Tampa, FL.

Enriquez, H.J., N. Mladenov, G. Hettiarachchi., M. Kirk, S. Damaraju, K. Biver, M. Galkaduwa, M. Murray-Hudson, M. Gondwe, and P. Wolski.  Evaporative concentration, dissolved organic matter degradation and sulfate reduction as controls on arsenic mobility in groundwater of a pristine wetland. 2013 GSA Annual Meeting & Exposition, October 27-30, Denver, CO.

Hettiarachchi, G.M., C. Attanayake, P. Defoe, S. Martin, and G. M. Pierzynski. 2013. Potential for transfer of lead, arsenic and polycyclic aromatic hydrocarbons from amended urban soils to vegetables and humans.  American Chemical Society Fall 2013 National Meeting. September 8-12, Indianapolis, IN.

Davis, L., K. Roozeboom, V. Pidlisnyuk, M. Bel, I. Nagyova, Z. Melichova, L. Erikson, and G.M. Hettiarachchi. 2013.  Perennial grass miscanthus for biomass production and phytoremediation of slightly contaminated land. America's Grasslands Conference, Aug 12-14, 2013, Manhattan, KS.

Hettiarachchi G.M. C. Attanayake, P. Defoe, S. Martin, and G. M. Pierzynski. 2013. Field based evaluations of trace element transfer from contaminated urban garden soils to vegetables. Am. Soc. of Horticultural Science Annual Conference, July 22-25, Palm Desert, CA.

Karna, R., G.M. Hettiarachchi. 2013. Understanding Subsurface Transformations and Dynamics of Trace Elements in Natural and Bio Stimulated Multi-Metal Rich Soil/Geo Microcosms.  12th International Conference on Biogeochemistry of Trace Elements. Athens, GA. June 16-20, 2013.

Gudichuttu, V., G.M. Pierzynski, G.M. Hettiarachchi and L.R. Baker. 2013. Long-term Influence of Compost on Soil Chemical Parameters, Function of Microbes and Avoidance Response of Earthworms when Applied to Heavy Metal Contaminated Mine Wastes.  12th International Conference on Biogeochemistry of Trace Elements. Athens, GA. June 16-20, 2013.

Hettiarachchi, G.M. 2013. Growing crops on Brownfields Sites- How safe is it? National Brownfields Conference. May 15-17, Athens, GA.

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2012

Enriquez, H.J., N. Mladenov, P. Wolski, G. Hettiarachchi., D. McKnight, J. Ebert, P. Huntsman-Mapila, M. Murray-Hudson, and M. Wellington.  Influence of Abiotic and Biotic Processes on the Mobilization of Arsenic in Groundwater of the Okavango Delta, Botswana.  2012 GSA Annual Meeting & Exposition, Nov. 2012, Charlotte, NC.

Attanayake, C., G.M. Hettiarachchi, S. Martin, P. Defoe, and G.M. Pierzynski. Potential for Transfer of Lead, Arsenic and Polycyclic Aromatic Hydrocarbons from Compost Added Urban Soils to Vegetables and Humans. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Brown, S. and G.M. Hettiarachchi. Use of Urban Residuals to Reduce Pb and As Bioaccessibility. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Defoe, P. and G. M. Hettiarachchi.  2012. Reducing Bioaccessibility of Lead and Arsenic in a Contaminated Urban Garden Soil. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Galkaduwa, B., G.M. Hettiarachchi, G. Kluitenberg, and S. Hutchinson. Understanding Transport and Transformations of Selenium in Flue-Gas Desulfurization Waste Water Using Continuous Flow Column Systems. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Hettiarachchi, G.M. Contaminants In Urban Gardens- Lessons Learned In the Past. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Karna, R. and G.M. Hettiarachchi.  Understanding Subsurface Transformations and Dynamics of Trace Elements in Multi-Metal Contaminated Mine Waste Materials in Southeast Kansas. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Pierzynski, J., G.M. Hettiarachchi, and R. Khatiwada.  Mobility, Availability and Reaction Products of MAP, DAP and APP Fertilizers. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Pitumpe Arachchige, P., D. Menefee, G.M. Hettiarachchi, L. Maurmann, C.W. Rice, and A. Edgerley. Chemistry and Mineralogy of Soil Aggregates in Soils from Temperate Continuous Corn System- Effects of Different Management Practices. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Price, J. and G.M. Hettiarachchi. Trace Metal Concentration and Partitioning Among Vegetable Varieties. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

Silva, R.C., G.M. Hettiarachchi, T. Muraoka, and S.H. Chien. Diffusion, Fate and Reaction Products of Phosphate Fertilizers with Varying Solubility Applied to a Tropical Soil. ASA/SSSA/CSA Annual Meetings, Oct. 2012, Cincinnati, OH.

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2011

Crawford, M., L. Kelly, S. Ford, G. Hettiarachchi, D. van der Merwe, R. Karna, M. Tuttle, and S. Datta. 2011.  Selenium speciation and mobilization in a controlled wetland system:  Pariette wetlands, UT. American Geophysical Union Meeting, Dec. 2011, San Francisco, CA.

Martin, S. and G.M. Hettiarachchi. 2010.  Community Gardens on Brownfields – Safe or Risky? Society of Environmental Chemistry and Toxicology North America 31st Annual Meeting.  Nov. 2010. Portland, Oregon.

Neal, A., J. Mohajerin, K. Johannesson, G. Hettiarachchi, and S. Datta. 2011. Linking sediment geochemistry to arsenic and manganese mobility in aquifers in Murshidabad, West Bengal, India. Geological Society of America Annual Meeting, Oct. 2011, Minneapolis, MN.

Defoe, P., G. M. Hettiarachchi, C. Benedict, C. Attanayake, and S. Martin.  2011. Gardening on arsenic and lead-contaminated brownfields: Is it safe? ASA/SSSA/CSA Annual Meetings, Oct. 2011, San Antonio, TX.

Harms, A., S. Thien, D. Presley, and G. Hettiarachchi.  2011. Meeting the educational needs of today's agronomy students at Kansas State University. ASA/SSSA/CSA Annual Meetings, Oct. 2011, San Antonio, TX.

Harms, A., D. Presley, G. Hettiarachchi, and S. Thien. 2011.  Needs assessment survey of urban gardeners and farmers on soil contamination. ASA/SSSA/CSA Annual Meetings, Oct. 2011, San Antonio, TX.

Premarathna, H., M. McLaughlin, J. Kirby, G. Hettiarachchi, S. Stacey, and D. Chittleborough. 2011.  Highly effective fertiliser formulations to enhance selenium biofortification in rice grain.  ASA/SSSA/CSA Annual Meetings, Oct. 2011, San Antonio, TX.

Attanayake, C., G. Hettiarachchi, P. Defoe, S. Martin, and G. Pierzynski. 2011. A field evaluation of lead transfer from urban soils to vegetables.  ASA/SSSA/CSA Annual Meetings, Oct. 2011, San Antonio, TX.

Khatiwada, R. and G.M. Hettiarachchi.  2011. Mobility, availability and reaction products of MAP, DAP, and APP fertilizers in acid and calcareous soils.  ASA/SSSA/CSA Annual Meetings, Oct. 2011, San Antonio, TX.

Hettiarachchi, G.M., C. Attanayake, P. Defoe, S. Martin, C. Benedict, and A. Harms. 2011.   Evaluating lead and arsenic transfer from contaminated urban garden soils to vegetable plants.  8th International Conference on Phytotechnologies.  Sep. 2011, Portland, Oregon.

Hettiarachchi, G.M., D. Van der Merwe, S. Datta, L. Erickson, L. Davis, and S. Martin.  2011.   Soil arsenic and potential risk pathways of arsenic in urban garden soils.  .  8th International Conference on Phytotechnologies.  Sep. 2011, Portland, Oregon.

Hettiarachchi, G.M., C. Attanayake, P. Defoe, S. Martin, A. Harms, D. Presley, and G. M. Pierzysnki. 2011.   Field based evaluations of trace element transfer from contaminated urban garden soils to plants.  Proceedings of the 11th Intern. Conf. on the Biogeochemistry of Trace Elements, 3-7 July. Florence, Italy.

Pierzynski, G.M., W. Friesl, W. Hartley, G.M. Hettiarachchi, J. Kumpiene, P. Madejon, and M. Mench. 2011. In situ stabilization/phytostabilization and site revegetation.  Proceedings of the 11th Intern. Conf. on the Biogeochemistry of Trace Elements, 3-7 July. Florence, Italy.

Hettiarachchi, G.M., R. Khatiwada, and D. Mengel. 2011. Speciation and potential availability of phosphorus in reduced tillage system: Placement and source effect.  Proceedings of 2011 Fluid Forum, 16-17 February 2011, Scottsdale AZ, USA.

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2010

Khatiwada, R., G.M. Hettiarachchi, and D. Mengel.  2010.  XANES Speciation of Phosphorus in Reduced-till System: Placement and Source Effect.  ASA/SSSA/CSA Annual Meetings, Nov. 2010, Long Beach, CA.

Gudichuttu, V., G.M. Hettiarachchi, and G.M. Pierzynski.  2010. Long Term Monitoring of Vegetative Response and Microbial Activity Upon the Addition of Amendments to a Metal Contaminated Mine Waste.  ASA/SSSA/CSA Annual Meetings, Nov. 2010, Long Beach, CA.

Nelson, N.O., G.M. Hettiarachchi, S. Agudelo-Arbelae, J. Henso, J. Lemunyon, P. Kulako, and S. Andrews   Phytoremediation Database Project. ASA/SSSA/CSA Annual Meetings, Nov. 2010, Long Beach, CA.

Tran A., G.M. Hettiarachchi, M. Ransom, D. Mengel, and J. Matz.  2010. Extractable K in Kansas Soils: Effects of Soil Moisture and Drying Conditions. .  ASA/SSSA/CSA Annual Meetings, Nov. 2010, Long Beach, CA.

Hettiarachchi, G.M., S. Martin, C. Attanayake, P. Defoe, B. Leven, L. Erickson, and G. Pierzynski.  2010.  Gardening on Brownfields Sites: Evaluating Trace Element Transfer from Soil to Plants. 7th International Conference on Phytotech.  Sep. 2010, Parma, Italy. 

Hettiarachchi, G.M., S. Martin, A. Raes, P. Defoe, D. Presley, and G.M. Pierzynski.  2010.  Gardening on Brownfields Sites: Evaluating Trace Element Transfer from Soil to Plants and Their Transformations in Soils.  19th World Congress of Soil Science.  Aug. 2010. Brisbane, Australia.

Pierzynski, G.M., L. Baker, G.M. Hettiarachchi, K.G. Scheckel, V. Gudichuttu, and R. Pannu.  2010.  The Tri-State Mining Region USA:  Twenty years of trace element research.  19th World Congress of Soil Science.  Aug. 2010. Brisbane, Australia.

Premarathna, L., S. P. Indraratne, and G.M. Hettiarachchi.  2010.  Heavy Metal Concentration in Crops and Soils Collected from Intensively Cultivated Areas of Sri Lanka.  19th World Congress of Soil Science.  Aug. 2010. Brisbane, Australia.

Milani, N., M.J. McLaughlin, G.M. Hettiarachchi, D.G. Beak, J.K. Kirby, and S. Stacey. Fate of nanoparticulate zinc oxide fertilisers in soil: Solubility, diffusion and solid phase speciation.  19th World Congress of Soil Science.  Aug. 2010. Brisbane, Australia.

Premarathna, L. M.J. McLaughlin, J.K. Kirby, G.M. Hettiarachchi, S.P. Stacey, and D. Chittleborough. 2010. Availability of Fertiliser Selenium in Soils during Flooding and Subsequent Aeration.  19th World Congress of Soil Science.  Aug. 2010. Brisbane, Australia.

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2009

Hettiarachchi, G.M., S. Martin, and B. Leven. 2009.  Brownfields to community gardens - Can it be done? 6th International Conference on Phytotechnologies.  Dec. 2009. St. Louis, MO.

Martin, S., and G.M. Hettiarachchi.  2009. Healthy Foods from Brownfields? Brownfields Conference. Nov. 2009. New Orleans, LA.

Hettiarachchi, G.M., R. Pannu, G.M. Pierzynski, K. Scheckel, and C.W. Rice.  2009.  Understanding biogeochemical transformations of trace elements in multi metal-rich geomaterials under stimulated redox conditions. ASA/SSSA/CSA Annual Meetings, Nov. 2009, Pittsburgh, PA.

Premarathna, L. M.J. McLaughlin, J.K. Kirby, G.M. Hettiarachchi, S.P. Stacey, and D. Chittleborough. 2009. Potential availability of fertilized selenium in field capacity and submerged soils as measured by isotopic dilution technique. ASA/SSSA/CSA Annual Meetings, Nov. 2009, Pittsburgh, PA.

Pierzynski, G.M., B. Leven, G. Hettiarachchi, and s. Martin.  2009.  Brownfield sites assessment and remediation in the United States: Successes and Challenges.  Cleanup 09 Conference, Adelaide, Australia.

Pierzynski, G.M., L. Baker, and G.M. Hettiarachchi.  2009.  The use of soil amendments for the remediation of heavy metal contaminated sites.  Cleanup 09 Conference, Adelaide, Australia.

Milani, N., M.J. McLaughlin, J.K. Kirby, G.M. Hettiarachchi, D. Beak, and S.P. Stacey 2009.  Zinc diffusion and speciation in an alkaline calcareous soil treated with fertilizers coated with bulk and nanoparticulate zinc.  13th Australasian Society for Ecotoxicology Conference, Sep. 20-23, Adelaide, Australia.

De Livera, J., D. Beak, M. McLaughlin, J. Kirby, and G. Hettiarachchi. 2009.  Cadmium solubility in paddy soils: Effects of variable redox conditions and competitive ions. 13th Australasian Society for Ecotoxicology Conference, Sep. 20-23, Adelaide, Australia.

Martin, S. and G. Hettiarachchi.  2009. Healthy foods from brownfields? American Society for horticultural Science.  ASHS Annual Conference25-28 July, 2009. St. Louis, MO.

Hettiarachchi, G.M., R. Pannu, G.M. Pierzynski, K.G. Scheckel, C.W. Rice, M. Paloma, and M. Newville. 2009.  Subsurface transformations of trace elements in reduced multi metal-rich geo-materials using noninvasive x-ray spectroscopy techniques.  Proceedings of the 10th Intern. Conf. on the Biogeochemistry of Trace Elements, 13-16 July. Chihuahua, Mexico.

De Livera, J., M. McLaughlin, J. Kirby, and G. Hettiarachchi. 2009.  Cadmium solubility in paddy soils: effects of variable redox conditions and competitive ions. Proceedings of the 10th Intern. Conf. on the Biogeochemistry of Trace Elements, 13-16 July. Chihuahua, Mexico.

Beak, D., J. Kirby, G. Hettiarachchi, and M. McLaughlin. 2009.  Cobalt distribution and speciation in soils exposed to altered redox conditions through submergence. Proceedings of the 10th Intern. Conf. on the Biogeochemistry of Trace Elements, 13-16 July. Chihuahua, Mexico.

Baker, L., G.M. Pierzysnki, G. Hettiarachchi, and K. Scheckel.  2009.  Influence of P on the speciation of Pb and Zn in a Pb/Zn smeltercontaminated soil. Proceedings of the 10th Intern. Conf. on the Biogeochemistry of Trace Elements, 13-16 July. Chihuahua, Mexico.

Hettiarachchi, G., McLaughlin, M., Scheckel, K., Chittleborough, D., and Newville, M. 2009. Reactions of fluid and granular copper and molybdenum-enriched compound fertilisers in acidic and alkaline soils. Proceedings of 2009 Fluid Forum, 16-17 February 2009, Scottsdale AZ, USA.

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2008

McLaughlin, M.J., G. M. Hettiarachchi, S. Stacey, T. McBeath, R. Holloway, and J. Kirby.  2008.  Improving phosphorus and trace element fertilizer efficiency in Australia: Achievements and prospects. International Fertilizer Industry Associations Crossroads Asia-Pacific 2008 Conference. Dec. 16-18.  Melbourne, Australia.

Pierzynski, G.M., L. Baker, G.M. Hettiarachchi, and K.G. Scheckel. The Use of Soil Amendments for the Remediation of Heavy Metal-Contaminated Sites. 14th International Conference on Heavy metals in the Environment. Taipei, Taiwan. Nov. 16-23, 2008.

Hettiarachchi, G.M., McLaughlin, M.J., Scheckel, K.G., Chittleborough, D., and Newville, M. 2008. Speciation of Fluid- and Granular-fertilizer Derived Cu and Mo in a Calcareous and an Acid Soil using Micro- X-ray -Fluorescence, and –Absorption. ASA/SSSA/CSA Annual Meetings, Oct. 2008, Houston, TX.

Baker, L., G.M. Pierzynski, G.M. Hettiarachchi, K.G. Scheckel, and M. Newville. Speciation of Pb and Zn after the Addition of Different P Amendments to a Smelter-Contaminated Soil. ASA/SSSA/CSA Annual Meetings, Oct. 2008, Houston, TX.

Nicoloso, R., C. Costa, C.W. Rice, T. Amado, G. Hettiarachchi., M. Arango. Carbon Stabilization in Oxisol and Mollisol under Long-Term No-Till. ASA/SSSA/CSA Annual Meetings, Oct. 2008, Houston, TX.

De Livera, J., M. McLaughlin, J. Kirby, and G. Hettiarachchi. 2008. Limiting Cd accumulation in paddy rice grain: Roles of soil redox and competitive ions. Proceedings of 5th Society of Environmental Toxicology and Chemistry (SETAC) World Congress, 3 - 7 August 2008. Sydney, Australia.

Wen, J., M.J. McLaughlin, S.P. Stacey, G.M. Hettiarachchi, and J. Kirby. Improving cadmium phytoextraction using rhamnolipid. Proceedings of 5th Society of Environmental Toxicology and Chemistry (SETAC) World Congress, 3 - 7 August 2008. Sydney, Australia.

Premaratna, L., M.J. McLaughlin, G.M. Hettiarachchi, J.K. Kirby, S.P. Stacey, and D. Chittleborough. Effect of moisture, time and form of Selenium on its partitioning in Paddy Soils. Proceedings of 5th Society of Environmental Toxicology and Chemistry (SETAC) World Congress, 3 - 7 August 2008. Sydney, Australia.

Biasoli, M., Kirby, J., Hettiarachchi, G., Ajmone-Marsan, F., and McLaughlin, M. 2008. Copper and Zn labile pools changes in intermittently flooded soils using isotope dilution techniques. Proceedings of the Eurosoil Conferences, August 2008, Vienna.

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Previous Proceeding papers/Published abstracts/Presentations 

Hettiarachchi, G.M., McLaughlin, M.J., Scheckel, K.G., Chittleborough, D.J., Newville, M., and Lombi, E. 2007. Spectroscopic Investigations of Mobility and Speciation of Fertilizer-derived Copper, Manganese, and Zinc in Calcareous Soils.  Proceedings of the 9th Intern. Conf. on the Biogeochemistry of Trace Elements, 15-19 July. Beijing, China.

Lombi, E., G.M. Hettiarachchi, K.G. Scheckel, and R.E. Hamon.  2007.  Natural attenuation of copper toxicity in soils and soil constituents: a synchrotron and isotopic investigation.  Proceedings of the 9th Intern. Conf. on the Biogeochemistry of Trace Elements, 15-19 July. Beijing, China.

Wendling, L. A., G.M. Hettiarachchi, J. K. Kirby, and M. J.McLaughlin. 2007.  X-ray absoption spectroscopic investigations on cobalt speciation and ageing in soils.  Proceedings of the 9th Intern. Conf. on the Biogeochemistry of Trace Elements, 15-19 July. Beijing, China. 

Hettiarachchi, G., McLaughlin, M., Scheckel, K., Chittleborough, D., and Newville, M. 2007. Why we think fluid trace elements are more effective than granular trace elements. GRDC Eyre Peninsula Farming Systems 2006 Summary.

Hettiarachchi, G.M., McLaughlin, M.J., Scheckel, K.G., Chittleborough, D.J., Newville, M., and Lombi, E. 2007. Microscopic and spectroscopic investigations to understand reaction products of fluid and granular micronutrient fertilizers in calcareous soils. Proceedings of 2007 Fluid Forum, Scottsdale AZ, USA, 18-20 February 2007.

Hettiarachchi, G. M., E. Lombi, M. J. McLaughlin, and D. Chittleborough.  2006.  Spectroscopic investigations towards understanding fluid and granular fertilizer-derived micronutrients in soils.  Australian Soil Science Society meeting, December 4-8, Adelaide. Australia.

Jassogne, L., G. M. Hettiarachchi, M. Newville, D. Chittleborough, and H. Lambers.  2006.  Understanding distribution and speciation of Mn, Fe, Cu, and Zn surrounding old root channels in a duplex soil.  Australian Soil Science Society meeting, December 4-8, Adelaide. Australia.

Hettiarachchi, G. M., E. Lombi, M. J. McLaughlin, and D. Chittleborough.  2006.  Isotopic and spectroscopic investigations toward understanding differential behaviour of fluid and granular micronutrient fertilizers in soils.  18th World Congress of Soil Science, July 9-15, Philadelphia, U.S.A.

Holloway, B., Brace, D., Richter, I., McLaughlin, M., Hettiarachchi, G., Armstrong, R. 2006. Improving micronutrient availability with fluids.  Proceedings of 2006 Fluid Forum “Fluids: Balancing Fertility and Economics”, Scottsdale AZ, USA, 12-14 February 2006.

Holloway, B., Brace, D., Richter, I., Hettiarachchi, G., McLaughlin, M. 2006. Improving micronutrient efficiency and availability with fluid fertilizers.  GRDC Grains Research Update, Adelaide, February 2006.

Hettiarachchi, G., McBeath, T., Lombi, E., McLaughlin, M., Chittleborough, D. 2006. P, Zn and Mn fluid and granular fertilizers: movement and availability. GRDC Eyre Peninsula Farming Systems 2005 Summary.

Hettiarachchi, G. M., E. Lombi, M. J. McLaughlin, and D. Chittleborough.  2005.  Lability and mobility of zinc and manganese fertilizers in soil. ASA/SSSA/CSA Annual Meetings, Nov. 2005, Salt Lake City, UT.

Hettiarachchi, G.M., K. Scheckel, J. Ryan.  2005.  Micro scale investigations to understand binding mechanisms in bioslids using synchrotron based X-ray fluorescence and X-ray absorption. ASA/SSSA/CSA Annual Meetings, Nov. 2005, Salt Lake City, UT.

Premarathna, H.M.P.L., G. M. Hettiarachchi, and S.P. Indraratna.  2005.  Accumulation of cadmium in vegetables growing in Upcountry soils.  Annual Congress of Postgraduate Institute of Agriculture. Tropical Agricultural Research, Vol. 17.

Hettiarachchi, G. M., K. G. Scheckel, and J. A. Ryan.  2005. X-ray microprobe and spectroscopic approaches to understand mechanisms of metal binding in biosolids.  In Proceedings of the 8th Intern. Conf. on the Biogeochemistry of Trace Elements, p. 130. April 3-7. Adelaide, Australia.

Scheckel, K.G., G.M. Hettiarachchi, and J.A. Ryan. 2004.  Spectroscopic Approaches to Defining the Inorganic and Organic Constituents of Biosolids. Sustainable Land Application Conference. Lake Buena Vista, FL.

Ryan, J.A., G.M. Hettiarachchi, K.G. Scheckel, and R.L. Chaney. 2004.  Effect of biosolids application on soil metal chemistry and phytoavailability. Sustainable Land Application Conference. Lake Buena Vista, FL.

Ryan, J.A., and G.M. Hettiarachchi.  2003.  Effects of biosolids on sorption and desorption behavior of cadmium in biosolids-amended soils. ASA/SSSA/CSA Annual Meetings, Nov. 2003, Boulder, CO.

Hettiarachchi, G. M. and J. A. Ryan. 2002.  X-ray microscopy and spectroscopy studies on metal binding in biosolids.  ASA/SSSA/CSA Annual Meetings, Nov. 2002, Indianapolis, IN.

La-Fluer, C.M., G.M. Hettiarachchi, and J.A. Ryan. 2002.  Sorption of Cadmium onto Different Fractions of Biosolids and Cadmium Salt-Amended Soils.  ASA/SSSA/CSA Annual Meetings, Nov. 2002, Indianapolis, IN.

Impellitteri, C.A., K.G. Scheckel, G.M. Hettiarachchi, J.A. Ryan, and P.M. Randall. Sorption of arsenate and arsenite on a ruthenium compound: A macroscopic and microscopic study.  ASA/SSSA/CSSA Annual Meetings, Nov. 2002.  Indianapolis, IN.

Ryan, J.A., G.M. Hettiarachchi, and K.G. Scheckel.  2002.  Alterations of soil metal chemistry and phytoavailability associated with biosolids application.  Annual Meetings of the Society of Environmental Toxicology and Chemistry, Nov. 2002.  Salt Lake City, UT.

Xia, K. and G.M. Hettiarachchi.  2002.  Bioaccessibility Evaluation of 2, 4-D in Soils Using a Gastro-Intestinal Digestive Tract Model.  Annual Meetings of the Society of Environmental Toxicology and Chemistry, Nov. 2002.  Salt Lake City, UT.

Impellitteri, C.A., K.G. Scheckel, G.M. Hettiarachchi, J.A. Ryan, and P.M. Randall. Sorption of arsenate and arsenite on a ruthenium compound: A macroscopic and microscopic study.  Annual meetings of the American Institute of Chemical Engineers, Nov. 2002. Indianapolis, IN.

Hettiarachchi, G. M., J. A. Ryan, and K. G. Scheckel.  2002. Applications of Synchrotron Radiation to Environmental Studies: Role of iron and manganese oxides in biosolids and biosolids-amended soils on metal binding.  223rd ACS National Meeting. April 2002, Orlando, Fl.

Hettiarachchi, G. M. and J. A. Ryan. 2001. Adsorption of cadmium onto different fractions of biosolid-amended soils.  In Agron. Abstracts, Am. Soc. of Agronomy, Madison, WI.

Pierzynski, G.M., G.M. Hettiarachchi, F. Oehme, and O. Sonmez. 2001.  In-situ stabilization of soil lead using phosphorus and other soil amendments. 222nd ACS National Meeting, August 26-30, Chicago, IL. 

Hettiarachchi, G. M., J. A. Ryan, and Z. Li.  2001. Adsorption of cadmium onto organic, total inorganic, and metal oxide fractions in biosolids and biosolid-amended soils.  In Proceedings of the 6th Intern. Conf. on the Biogeochemistry of Trace Elements, p. 165. July 29-August 2. Guelph, Canada.

Hettiarachchi, G. M., G. M. Pierzynski, F. W. Oehme, and O. Sonmez.  2001. Absorption of lead from a contaminated soil treated with phosphorus and manganese oxides by Sprague-Dawley rats. In Proc. of the 6th Intern. Conf. on the Biogeochemistry of Trace Elements, p.479. July 29-August 2. Guelph, Canada.

Hettiarachchi, G. M. and G. M. Pierzynski. 2000.  A novel method for in situ stabilization of soil lead.  In Agron. Abstracts, p. 401, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G.M., and G.M. Pierzynski.  2000.  In-situ stabilization of soil lead using phosphorus and other soil amendments.  P. 301-304. In Y.M. Luo et al. (eds), Proceedings of SOILREM 2000, Hangzhou, China

Hettiarachchi, G. M. and G. M. Pierzynski. 2000.  The use of phosphorus and other soil amendments for in situ stabilization of soil lead.  In Proc. of the 2000 Conference on Hazardous Waste Research, p. 125-133.

Pierzynski, G. M. and G. M. Hettiarachchi. 1999.  In situ stabilization of soil lead: Effects on plant metal uptake. In Agron. Abstracts, p. 338, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M. and G. M. Pierzynski. 1999.  Use of phosphorus and other soil amendments on in situ stabilization of soil lead. In Agron. Abstracts, p. 338, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M. and G. M. Pierzynski. 1999. Effects of phosphorus and other soil amendments on lead, cadmium and zinc bioavailability.  In W. W. Wenzel, D. C. Adriano, B. Alloway, H. E. Doner, C. Keller, M. Mench, R. Naidu and G. M. Pierzynski (Eds.)  Proc. 5th  Intern. Conf. on the Biogeochemistry of Trace Elements, p. 514-515, July 11-15, Vienna.

Lambert, M., Pierzynski, G., Hettiarachchi, G., Erickson, L., and Sweeney, D., Revegetation of Heavy Metal - Contaminated    Mine Tailings (Chat), In Proc. of the 1999 Conference on Hazardous Waste Research, p. 114-120.

Lambert, M. W., Hettiarachchi, G. M. and G. M. Pierzynski. 1998.  Chemistry and mineralogy of heavy metals in a smelter slag. In Agron. Abstracts, p. 333, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M. and G. M. Pierzynski. 1998.  Effects of phosphorus and other soil amendments on lead bioavailability.  In Agron. Abstracts, p. 333, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M. and G. M. Pierzynski. 1997.  Soil amendments effects on heavy-metal bioavailability. In Agron. Abstracts. p. 330, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M., G. M. Pierzynski, J. Zwonitzer, and M. Lambert. 1997.  Phosphorus source and rate effects on cadmium, lead and zinc bioavailabilities in a metal-contaminated soil.  In I. K. Iskandar, S. E. Hardy, A. C. Chang, and G. M. Pierzynski (Eds)  Proc. of the 4th International conference on the Biogeochemistry of Trace Elements. p. 463-464.  June 23-26.  Clark Kerr Campus. Berkeley, CA.

Lambert, M. W., G. M. Pierzynski, and G. M. Hettiarachchi. 1997.  Phosphorus remediation of a Lead-zinc smelter slag. In I. K. Iskandar, S. E. Hardy, A. C. Chang, and G. M. Pierzynski (Eds) Proc. of the 4th International conference on the Biogeochemistry of Trace Elements. p. 465-466.  June 23-26. Clark Kerr Campus. Berkeley, CA.

Lambert, M. W., G. M. Pierzynski, and G. M. Hettiarachchi. 1997. The use of phosphorus in sequestration of lead and cadmium in a smelter slag.  In Proc. of the 12th annual conference on Hazardous Waste Research.

Lambert, M. W.,G. M. Pierzynski, and G. M. Hettiarachchi. 1996.The influence of phosphorus on chemical and mineralogical properties of zinc/lead smelter slag. HSRC WERC 1st Joint Conference on the Environment Abs., p. 107.

Hettiarachchi, G. M. and G. M. Pierzynski. 1996.  The influence of phosphorus source and rate on soil solution cadmium, lead and zinc activities. In Agron. Abs., p. 333, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M., G. M. Pierzynski, and J. L. Havlin. 1995.  The effect of time on phosphorus supply characteristics of two Kansas soils. In Agron. Abs., p.275, Am. Soc. of Agronomy, Madison, WI.

Hettiarachchi, G. M. and M. W. Thenabadu. 1992. Phosphorus release efficiency of two indigenous sources of fertilizer materials. In Proc. of 48th Annual session, Sri Lanka Assoc. Adv. Sci. Dec. 11, Colombo, Sri Lanka.

Hettiarachchi, G. M. and M. W. Thenabadu. 1992. Response of rice (variety BG 34-8) to four phosphate fertilizer materials. In Proc. of 48th Annual session, Sri Lanka Assoc. Adv. Sci. Dec. 11, Colombo, Sri Lanka.

Hettiarachchi, G. M. and M. W. Thenabadu. 1992. Release of phosphorus from Eppawala rock phosphate in an acid sulfate soil from Matara.  In Proc. of 48th Annual session, Sri Lanka Assoc. Adv. Sci. Dec. 11, Colombo, Sri Lanka.