Prof. R.S. Dharmakeerthi

Prof. R.S. Dharmakeerthi

(Head of the Department)
  • Faculty of Agriculture, University of Peradeniya, Sri Lanka.
  • 0812395255
  • Ph.D. (University of Guelph, Canada) 2002
    M.Sc. (Agric.) (University of Peradeniya, Sri Lanka) 1994
    B.Sc. (Agric.) (University of Peradeniya, Sri Lanka) 1990
  • Soil Science Society of Sri Lanka (Life Member)
    Sri Lanka Association for the Advancement of Science (Life Member)
    Geo-Infomatics Society of Sri Lanka (Life Member)
    Soil Science Society of America (Member)
    International Biochar Initiative (Member)
  • Development of eco-friendly farming technologies to minimize inorganic fertilizer usage while maintaining adequate productivity and improving soil fertility.  (Read more)
  • Long term effect of single application of Rice Husk and Corn Cob Biochar on physical, hydrothermal properties and carbon dynamics in maize cultivated Reddish Brown Earth soil.  (Read more)
  • A Scalable Bio-based Solution to Eliminate Cyanotoxins in Drinking Water (Read more)


  • Liyanage, L. R. M. C., Sulaiman, M. F., Ismail, R., Gunaratne, G. P., Dharmakeerthi, R. S., Rupasinghe, M. G. N., Mayakaduwa, A.P.  & Hanafi, M. M. (2021). Carbon Mineralization Dynamics of Organic Materials and Their Usage in the Restoration of Degraded Tropical Tea-Growing Soil. Agronomy, 11(6), 1191.
  • Nawarathna, K. K., Dandeniya, W. S., Dharmakeerthi, R. S., & Weerasinghe, P. (2021). Evaluating the nitrification inhibition potential of selected botanicals and their non-target effects. Canadian Journal of Soil Science, (ja).
  • Concepcion, A., Kumaragamage, D., Akinremi, W., Dharmakeerthi, S., Goltz, D., & Indraratne, S. (2021). Phosphorus release from intact soil monoliths of manure amended fields under simulated snowmelt flooding. Journal of Environmental Quality. 50(1): 252-263.
  • Jayarathna, M.K.N.W. Dharmakeerthi R.S. and Rathnayaka W.M.U.K., 2021. Biochar Based Slow Release Urea Fertilizer: Production and Assessing the Effects on Growth of Rice and Nitrogen Dynamics in a Rice growing Alfisol. Tropical Agriculture Research. 32(2): 168-179.
  • Indraratne, S. P., Kumaragamage, D., Goltz, D., Dharmakeerthi, R. S., & Zvomuya, F. (2020). A laboratory assay of in situ stabilization of toxic metals in contaminated boreal forest soil using organic and inorganic amendments. Canadian Journal of Soil Science, 100(2), 109-119.
  • Kulasinghe, H.P.G.T.N., U.W.A. Vitharana, R.S. Dharmakeerthi, D.N. Sirisena, and W.M.U.K. Rathnayaka, 2020. Exploring yield response of paddy (Oryza sativa L.) under varying levels of soil nitrogen, phosphorus and potassium. Tropical Agriculture Research. 31(4):1-12.
  • Dharmakeerthi R.S., Kumaragamage, D., Indraratne, S.P., and Goltz, D. (2019b). Phosphorus release from unamended, gypsum amended and biochar amended soils under simulated spring snowmelt and summer flooding conditions, Journal of Environmental Quality. 48:822-830
  • Dharmakeerthi R.S., Kumaragamage, D., Indraratne, S.P., and Goltz, D. (2019a). Gypsum amendment reduces redox-induced phosphorous release from freshly manured, flooded soils to floodwater, Journal of Environmental Quality. 48:127-135
  • Duminda V.G., Mapa, R., Dharmakeerthi R., Biswas, A. (2016) Effect of rice husk biochar on selected soil properties in tropical Alfisols. Soil Research 54: 302-310
  • Dissanayake, D.K.R.P.L., Dharmakeerthi, R.S., Karunarathna, A.K. and Dandeniya, W.S., 2018. Changes in structural and chemical properties of rice husk biochar co-pyrolysed with Eppawala rock phosphate under different temperatures. Tropical Agricultural Research, 30(1), pp.19–31. DOI:
  • Upekshani, H.A.N., Dharmakeerthi, R.S., Weerasinghe, P. and Dandeniya, W.S., 2018. Fertilizer usage and land productivity in intensively cultivated vegetable farming systems in Sri Lanka: an analysis based on a questionnaire survey.Tropical Agricultural Research, 30(1), pp.44–55. DOI:
  • Dharmakeerthi, R. S., Hanley, K., Whitman, T., Woolf, D., & Lehmann, J. (2015). Organic carbon dynamics in soils with pyrogenic organic matter that received plant residue additions over seven years. Soil Biology and Biochemistry, 88: 268-274.


  • Dandeniya W.S., Dharmakeerthi R.S. (2020) Integrated Plant Nutrient Management in Major Agricultural Soils of Sri Lanka: A Review of the Current Status and the Way Forward. In: De Silva R.P., Pushpakumara G., Prasada P., Weerahewa J. (eds) Agricultural Research for Sustainable Food Systems in Sri Lanka. Springer, Singapore.
  • R S Dharmakeerthi, S P Indraratna and D Kumaragamage. 2007. Manual on Soil Sampling and Analysis. Soil Science Society of Sri Lanka, Peradeniya, Sri Lanka.