Prof. S. Rajika Amarasinghe

Professor

Department of Soil Science,
Faculty of Agriculture, University of Ruhuna,
Mapalana, Kamburupitiya,
Sri Lanka 81100

Research Interests

Qualifications

PhD | Saitama University, Japan
MPhil | University of Peradeniya, Sri Lanka
BSc in Agriculture | University of Ruhuna, Sri Lanka

Biography

Prof. S. Rajika Amarasinghe completed her PhD. in Saitama University, Japan in 2011. She joined the Faculty of Agriculture, University of Ruhuna in 2012. Prof. Amarasinghe seeks challenging responsibility for her career advancement while utilizing her knowledge and skills for the betterment of the organization, working with fullest dedication, determination, and resourcefulness. Her key interests are Soil Science, Water quality, Environmental Science, Solid waste management, Composting, Water pollution control & water stewardship, and Modelling of groundwater and Tank cascade systems.

Journal Publications

Total: 38

Amarasinghe, S. R. (2022). Effects of different additives on the quality of composts produced from ordinary garden leaf litter, Journal of Tropical Agricultural Research and Extension. vol. 25 (1):18-28.

Sewwandi, L. A. U., Amarasinghe, S. R., & Samarawickrama, U. I. (2022). Assessment of Chemical Retention of Riparian Area ( Thaulla ) in a Small Tank: A Study in Kankanam Tank, Weeraketiya, Sri Lanka. Proceedings of International Forestry and Environment Symposium, pp 120.

Jayaweera, W. M. C. S., Ranawake, A. L., & Amarasinghe, S. R. (2022). Comparison of paddy straw and paddy husk as mulching materials in Turmeric ( Curcuma longa L.) Proceedings of the International Symposium on Agriculture and Environment. pp 17.

Amarasinghe, S. R., & Madushanka P. L. A (2021). Spatial and Temporal Variation of Irrigation Water Quality of a Small Tank Cascade System in Up-stream of Malala Oya River Basin, Thanamalwila, Sri Lanka, Rajarata University Journal . 6(II), 84-91.

Amarasinghe, S. R. (2021). Use of Invasive Water Hyacinth plants for composting of ordinary leaf litter, Sri Lanka Journal of Agriculture and Environment. 3(1), 5-16.

Pathmasiri, P., Amarasinghe, S. R., & Samarawickrama, U. I. (2021). Spatial Variation of Hydro-chemical parameters in a Tank Cascade System in Hambantota District, International Conference on Environmental Governance (ICEG) pp 8.

Amarasinghe, S. R., Pallewatta, P. G. S., & Samarakoon, S. A. M. E. (2021). Effect of Water Hyacinth ( Eichhornia crassipes ) compost mixtures on growth attributes of Chilli ( Capsicum annuum ) International Symposium on Agriculture and Environment, University of Ruhuna, pp 33.

Amarasinghe, S. R., & Madushanka, P. L. A. (2021). Temporal and Spatial Variation of Irrigation Water Quality in a Tank Cascade System in Thanamalwila, Sri Lanka. 18th Academic session, University of Ruhuna, Sri Lanka. pp 6.

Pushpajith, W. A. K., Amarasinghe, S. R., & Prabhashini, R. H. G. B. (2021). Study on the Suitability of Artificial Floating Wetlands to Purify Eutrophic Water Bodies. 18th Academic session, University of Ruhuna, Sri Lanka, pp 7.

Tharupath, K. M. C., Samaraweera, G. C., & Amarasinghe, S. R. (2021). Young Generation's Awareness and Perception on Solid Waste Management: A Case of School Children in Matara District. 18th Academic session, University of Ruhuna, Sri Lanka, pp 15.

I.S.U. Rupasinghe, A.A.R.W. Abeysinghe, S.R. Amarasinghe, D.A.L. Leelamanie. (2021). Influence of Biochar Addition on pH and EC of Municipal Solid Waste Composts. 18th Academic Sessions 2021University of Ruhuna, Matara, Sri Lanka. pp 9.

Amarasinghe, S. R. (2020). Health Risk Assessment of Heavy Metals in Drinking Water: A case study in Lenabatuwa Division of Southern Sri Lanka, Rajarata University Journal . 5(II), 108-114.

Amarasinghe, S. R., & Gunawardhana, L. A. A. S. M. (2020). Effect of vermicompost with inoculated biochar on Carbon and Nitrogen mineralization in Ultisols and Alfisols 13 th International Research Conference, General Sir John Kotelawala Defense University. pp 40-45.

Amarasinghe, S. R., Pathibha, N, J. K. P., D, R., S, P. U. M. V., C, T. K. M., & M, W. W. A. D. (2019). Assessment of Heavy Metal contamination and drinking water quality of drinking water sources in Kamburupitiya, Sri Lanka; a case study in Lenabatuwa and Iiriyathota GN divisions, 8th International Symposium on Agriculture and Environment, Faculty of Agriculture, University of Ruhuna, pp 129.

Amarasinghe, S. R. (2019). Assessment of Heavy metals in Compost Produced from Invasive Water Hyacinth ( Eichhornia crassipes ) in Moragoda Canal, Galle, Sri Lanka, 16th Academic sessions, University of Ruhuna, Sri Lanka. pp 20.

Amarasinghe, S. R., & Perera, P. C. D. (2018). Iron Toxicity of Lowland Rice Cultivated Soils Immediately after Flash Floods in Mapalana and Nayimbala, Sri Lanka, Wayamba International Conference, WinC 2018, Wayamba University of Sri Lanka, 24-25 August 2018, pp 103.

Jayasekara, L. D. S. I., Renuka, K. A., & Amarasinghe, S. R. (2018). Comparative Evaluation of some Soil Chemical Properties among Orchards and Natural Forest in Fruit Research and Development Institute, Horana 8th International Symposium on Agriculture and Environment. pp 24.

Amarasinghe, S. R., Nisansala, K. A., & Wanniarachchi, S. D. (2018). Nitrogen Mineralization Dynamics in an Ultisol of Sri Lanka with Two Different Organic Amendments and a Microbial Inoculant, 15th Academic sessions, University of Ruhuna, Sri Lanka pp 52.

Amarasinghe, S. R., Wanniarachchi, S. D., Weralugolla, S. S. S., & Peramunagama, S. S. M. (2017). The effect of a microbial inoculant on release of Phosphorous from different organic amendments in an Ultisol, International Symposium on Agriculture, Faculty of Agriculture, Eastern University of Sri Lanka, ISBN 978-955-1443-887:181-185.

Sandarenu, P. C., Peramunagama, S. W., Samaraweera, G. C., & Amarasinghe, S. R. (2017). Evaluation of a Poly-plastic Collection System in Matara District, Sri Lanka: A case Study in Kamburupitiya Pradeshiya Sabha 7 th International Symposium on Agriculture and Environment, pp141-143.

Amarasinghe, S. R., Premanatha, K. P. S. D., & Wanniarachchi, S. D. (2017). Carbon and Nitrogen Mineralization of Different Soil Amendments in Ultisols, 22nd International Forestry and Environment Symposium, Sri Lanka. pp 94.

Amarasinghe, S. R., Premanatha, K. P. S. D., & Wanniarachchi, S. D. (2017). Assessment of Quality in Different Compost Mixtures by End-use Characterization, 22nd International Forestry and Environment Symposium, pp 119.

Nisansala, K. A., Vithanage, M., Weerasundara, W. M. L. S., Jayawardana, Y. B., & Amarasinghe, S. R. (2017). Evaluation of the Influence of Biochar and Compost on the Saline Soil Properties and Quality 7th International Symposium on Agriculture and Environment, Faculty of Agriculture, University of Ruhuna, pp 7.

Sandarenu, P. C., Peramunagama, S. W., Samaraweera, G. C., & Amarasinghe, S. R. (2017). Evaluation of a Poly-plastic Collection System in Matara District, Sri Lanka: A case Study in Kamburupitiya Pradeshiya Sabha 7th International Symposium on Agriculture and Environment, pp141-143.

Marasinghe, M. G. T. T., Amarasinghe, S. R., Wanniarachchi, S. D., & Fernando, K. R. (2017). Assessment of heavy metal contamination of soil and surface water in the vicinity of landfill site at weligama, Matara, 4th Ruhuna International Science and Technology Conference (RISTCON 2017) pp 59.

Amarasinghe, S. R. (2016). Attitudes of Households toward Home-made Compost Application in Kalutara Urban Council Area, 13th Academic sessions, University of Ruhuna, Sri Lanka. pp 79.

Amarasinghe, S. R., Wanniarachchi, S. D., Somasiri, T. T., & Kumara, D. D. N. (2015). Impact of organic amendments and microbial inoculants on carbon mineralization in surface Ultisols, PGIS research congress, Post Graduate Institute of Science, University of Peradeniya, pp 22.

Amarasinghe, S. R., & Fernando H. G (2014). Pro-environmental behavior regarding solid waste management in households of Kalutara urban council area: A case study, Journal of Tropical Forestry & Environment. Vol 4:1 p 80-84.

Amarasinghe, S. R. (2014). Factors influencing willingness to pay for the improved solid waste management, 11th Academic sessions, University of Ruhuna, Sri Lanka. pp 152.

Amarasinghe, S. R., & Fernando, H. G. (2013). Pro-environmental behavior regarding solid waste management in households of Kalutara urban council area: A case study. International Forestry and Environment Symposium, pp 56.

Amarasinghe, S. R., & Watanabe, K. (2012). Application of empirical models using evaporation method to estimate unsaturated hydraulic properties of soft rock International Forestry and Environment Symposium, pp 76.

Amarasinghe, S. R., Watanabe, K., & Ishiyama, K. (2011). Study on the selection of unsaturated flow model for the different types of soil and soft rock, Environmental Earth Science. 64:1795-1805. https://DOI 10.1007/s12665-011-0982-3. https://doi.org/10.1007/s12665-011-0982-3

View DOI

Amarasinghe, S. R., Watanabe, K., & Maung, M. M. (2011). Estimating unsaturated hydraulic properties of soft rock by three different flow models, Journal of Japan Society of Civil Engineers (JSCE), Ser. B1(Hydraulic Engineering), 67(4), 91-96. https://doi.org/10.2208/jscejhe.67.I_91.

View DOI

Amarasinghe, S. R., & Watanabe, K. (2011). Inverse estimation of unsaturated hydraulic properties using evaporation measurement techniques in sandy soil. International Symposium on Agriculture and Environment, Faculty of Agriculture, pp 98.

Amarasinghe, R., Kunio, W., & Gamal, A. (2010). Comparison between Campbell and van Genuchten models by inverse estimation of unsaturated properties, Annual Journal of Hydraulic Engineering, Japan Society of Civil Engineers, vol.54: 31-36.

De Siva, C. S., & Amarasinghe, S. R. (2008). Water Quantity assessment of Agro-wells in Vavuniya District, Water Resources Research in Sri Lanka, Geo Informatics Society of Sri Lanka, University of Peradeniya, ISBN 995-130-811-7: 57-69.

Amarasinghe, S. R., & De Silva, C. S. (2006). Water quality assessment of agro-wells in Vavuniya District for the use of Agricultural and Domestic purposes, Water Resources Research in Sri Lanka, Geo-Informatics Society of Sri Lanka, University of Peradeniya, ISBN 995-130-80-50: 41-54.