Prof. G.Y. Jayasinghe
+94 71 548 4578
+94 41 229 2384

Prof. G.Y. Jayasinghe

Senior Professor
Department of Agricultural Engineering & Environmental Technology,
Faculty of Agriculture, University of Ruhuna,
Mapalana, Kamburupitiya,
Sri Lanka 81100
Profile QR Code
Research Interests
Environmental engineering Hydrology Disaster management Green infrastructure Water resource management Waste reuse and synthetic soil aggregates
Qualifications
Positions
  • Dean | Faculty of Agriculture

Biography

Prof. G.Y. Jayasinghe is a Senior Professor in the Department of Agricultural Engineering and Environmental Technology, Faculty of Agriculture, University of Ruhuna. Research interests include Environmental engineering and Hydrology.

Research Engagements

Total: 7
  • 01
    1997–1998: Research on the influence of straw and biogas by-products as fertilizer materials on rice growth.
  • 02
    Jan 1998–Nov 2002: Studies to assess biogas liberation from different raw materials and methods to increase batch digester efficiency.
  • 03
    2002–2004: Assessment of biogas liberation efficiency from market garbage as alternative energy and biofertilizer (Environment Ministry funded).
  • 04
    2003–2004: Principal investigator on projects funded by the Environmental Ministry (climate change and related topics).
  • 05
    2004–2010: Research on waste management, land reclamation and environmental science at the University of the Ryukyus, Japan.
  • 06
    Project with the Council for Agricultural Research and Policy (CARP) on development and evaluation of a two-phase straw biogas digester.
  • 07
    Ongoing applied work in waste reuse, soil amelioration and container media development for sustainable agriculture.

Journal Publications

Total: 49
01
G.Y. Jayasinghe, Y. Tokashiki & I.D. Liyana Arachchi (2011). Development of sewage sludge based synthetic aggregates for containerized ornamentals. Environmental Technology (in press).
02
Jayasinghe, G. Y., & Tokashiki, Y. (2011). Influence of coal fly ash pellet aggregates on the growth and nutrient composition of Brassica campestris and physicochemical properties of grey soils in Okinawa, Japan. Plant Nutrition (in press).
03
Jayasinghe, G. Y. (2011). Synthetic soil aggregates as a potting media for ornamental plant production. Plant Nutrition (in press).
04
Utilization of agricultural waste compost as an alternative potting media component with coir dust for leafy vegetable Ipomoea aquatica. 8th Academic Sessions, University of Ruhuna, 22 Feb 2011. (W.K.R. Thushara & G.Y. Jayasinghe)
05
G.Y. Jayasinghe, Y. Tokashiki & M. Kitou (2010). Use of synthetic soil aggregates as a containerized growth medium component to substitute peat in ornamental plant production. Archives of Agronomy and Soil Science, 56(2), 183–199.
06
G.Y. Jayasinghe, Y. Tokashiki, M. Kitou & K. Kinjo (2010). Effect of synthetic soil aggregates as a soil amendment to enhance properties of problematic grey (Jahgaru) soils in Okinawa, Japan. Communications in Soil Science and Plant Analysis, 41, 649–664.
07
Jayasinghe, G. Y., & Tokashiki, Y. (2010). Evaluation of the use of synthetic red soil aggregates (SRA) and zeolite as substrate for ornamental plant production. Plant Nutrition, 33(14), 2120–2134.
08
G.Y. Jayasinghe, Y. Tokashiki, I.D. Liyana Arachchi & M. Arakaki (2010). Sewage sludge and sugarcane trash based compost and synthetic aggregates as peat substitutes in containerized media for crop production. Journal of Hazardous Materials, 174, 700–706.
09
G.Y. Jayasinghe, Y. Tokashiki & I.D. Liyana Arachchi (2010). Evaluation of containerized media developed by cattle manure compost and synthetic aggregates for ornamental plant production as a peat alternative. Resource Recycling and Conservation, 54(12), 1412–1418.
10
Anugroho, F., Kitou, M., Nagumo, F., Kinjo, K., & Jayasinghe, G. Y. (2010). Potential growth of hairy vetch as a winter legume cover crop in subtropical soil conditions. Soil Science and Plant Nutrition, 56(2), 245–262.
11
Synthetic aggregates as a potting media for ornamental plant production. 66th Annual Session of SLAAS, Dec 2010. (G.Y. Jayasinghe)
12
Potential utilization of composted sewage sludge in growth media for lettuce cultivation. International Symposium, Faculty of Agriculture, University of Ruhuna, 16 Nov 2010. (G.Y. Jayasinghe & Y. Tokashiki)
13
G.Y. Jayasinghe, Y. Tokashiki, M. Kitou & K. Kinjo (2009). Coal fly ash based synthetic aggregates as potential alternative container substrates for ornamentals. Plant Nutrition and Soil Science, 172(5), 720–728.
14
G.Y. Jayasinghe, Y. Tokashiki & M. Kitou (2009). Evaluation of coal fly ash based synthetic aggregates as a soil amendment for low productive acidic red soil. Water, Air, & Soil Pollution, 204, 29–41.
15
G.Y. Jayasinghe, Y. Tokashiki & K. Kinjo (2009). Recycling of coal fly ash and paper waste to improve the low productive red soil in Okinawa, Japan. Clean – Soil, Air, Water, 37(9), 687–695.
16
Kinjo, K., Komiya, Y., Tokashiki, Y., Kitou, M., Jayasinghe, G. Y., & Anugroho, F. (2009). White crystal material developed from the Shimajiri mudstone in Okinawa islands, Japan. Journal of Clay Science, 48(3), 131–136.
17
Influence of coal fly ash-based pellet aggregates addition on physicochemical properties of acidic soils in subtropical Okinawa, Japan,, their effect on the growth, nutrient content of Brassica campestris. Japanese Society of Soil Science and Plant Nutrition, 15–18 Sep 2009, Kyoto, Japan. (G.Y. Jayasinghe, Y. Tokashiki & M. Kitou)
18
Synthetic coal fly ash–paper waste aggregates as an option for waste management, a soil amendment to improve low productive soils. International Conference, Asian Institute of Technology, 5–7 Jan 2009, Bangkok, Thailand. (G.Y. Jayasinghe & Y. Tokashiki)
19
Utilization of bagasse sewage sludge based compost as a peat substitution for lettuce cultivation. Soil Science Society of America (SSSA), 1–5 Nov 2009, Pennsylvania, USA. (G.Y. Jayasinghe & Y. Tokashiki)
20
Substitution of peat with synthetic aggregates, bagasse sewage sludge based compost as a containerized media for crop production. R'09 Twin World Congress, 14–16 Sep 2009, Nagoya, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
21
Appropriate biogas generators for resource poor farmers in Sri Lanka to meet home energy, organic fertilizer needs. International Scientific Conference on Biogas Science, 2–4 Dec 2009, Erding, Germany. (K.D.N. Weerasinghe, S. Wijetunge & G.Y. Jayasinghe)
22
G.Y. Jayasinghe, Y. Tokashiki & M. Kitou (2008). Characteristics of synthetic soil aggregates produced by mixing acidic Kunigami Mahji soil with coal fly ash and their utilization as a medium for crop growth. Journal of Soil Science and Plant Nutrition, 54, 264–276.
23
G.Y. Jayasinghe, Y. Tokashiki, M. Kitou & K. Kinjo (2008). Oil palm waste and synthetic zeolite: an alternative soil-less growth substrate for lettuce production as a waste management practice. Waste Management & Research, 26, 559–565.
24
Kinjo, K., Tokashiki, Y., Kitou, M., Sato, K., Jayasinghe, G. Y., & Anugroho, F. (2008). Organic and inorganic composition of floating materials on surface water of river in mangrove forest. Journal of Clay Science, 47(3), 114–120.
25
Exploitation of coal fly ash based synthetic aggregates as a granular fertilizer medium, a soil amendment to improve crop production in low productive red soil in Okinawa, Japan. SSSA International Conference, 5–9 Oct 2008, Houston, Texas, USA. (G.Y. Jayasinghe & Y. Tokashiki)
26
Synthetic red soil paper waste aggregates as a potential soil amendment to enhance properties of problematic Jahgaru soils in Okinawa, Japan. Japanese Society of Soil Science and Plant Nutrition, 8–12 Sep 2008, Nagoya, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
27
Assessment, utilization of synthetic soil aggregates developed using coal fly ash, paper waste. American Society of Soil Science, 4–8 Dec 2007, New Orleans, USA. (G.Y. Jayasinghe & Y. Tokashiki)
28
Evaluation of the use of artificial zeolite, oil palm wastes as a substrate for crop production. Japanese Society of Soil Science and Plant Nutrition, 20–24 Aug 2007, Tokyo, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
29
Sustainable waste utilization to develop synthetic aggregates, their potential as a constituent of potting media. International Pacific Congress, 12–18 Jun 2007, Okinawa, Japan. (G.Y. Jayasinghe, Y. Tokashiki & M. Kitou)
30
Design of a two-phase digester system to optimize biogasification of rice straw. 4th Academic Sessions, University of Ruhuna, 29 Jan 2007. (S. Wijetunge, N.E. Punchihewa, K.D.N. Weerasinghe & G.Y. Jayasinghe)
31
Jayasinghe, G. Y., & Tokashiki, Y. (2006). Utilization of coal fly ash for the production of artificial aggregates as a crop growth medium with acidic Kunigami Mahji soils in Okinawa, Japan. Journal of Solid Waste Technology and Management, 32(1), 1–9.
32
Evaluation, utilization of synthetic soil aggregates developed using different waste materials. JSSPN, 5–8 Sep 2006, Akita, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
33
Agricultural, horticultural utilization of fly ash aggregates. 3rd Clean Coal Seminar, 5–7 Jul 2006, Okinawa, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
34
Poster, stall in annual industrial exhibition, Naha, Okinawa, 3–10 Oct 2006. (G.Y. Jayasinghe & Y. Tokashiki)
35
G.Y. Jayasinghe, Y. Tokashiki & M. Kitou (2005). Development of synthetic light weight soil aggregates utilizing coal fly ash and mine clay as waste materials. Journal of Tropical Agricultural Research and Extension (TARE), 8, 1–12.
36
Production, performance, micro-morphology of synthetic light weight soil aggregates developed using coal fly ash treated with starch as an organic binder. International Conference on Coal Science and Technology, 9–14 Oct 2005, Okinawa, Japan. (G.Y. Jayasinghe, Y. Tokashiki & L. Vidhana Arachchi)
37
Studies on improvement of rice straw biomethanation. International Conference on Recovery, Recycling and Re-integration, 25–29 Sep 2005, Beijing, China. (G.Y. Jayasinghe & L. Abegunawardana)
38
Influence of mixing synthetic lightweight aggregates developed using coal fly ash, used paper to amend Kunigami Mahji soils. Japanese Society of Soil Science and Plant Nutrition, 6–9 Sep 2005, Shimane, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
39
Development, exploitation of synthetic light weight soil aggregates produced by Kunigami Mahji soils with coal fly ash, used paper (in Japanese). JSSPN, 6–9 Sep 2005, Shimane, Japan. (Y. Tokashiki & G.Y. Jayasinghe)
40
Anaerobic digestion of market garbage, paddy straw to produce biogas, fertilizer as an environmentally friendly technique to manage solid waste. 9th Annual Forestry Congress, Jan 2004, Hikkaduwa. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
41
Manipulation of methane, biogas production of rice straw biomethanation. 59th Annual Session of SLAAS, Dec 2003. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
42
Consequences of C:N, C:P adjustments of rice straw on biomethanation in an anaerobic digester. 1st Academic Sessions, University of Ruhuna, Jul 2003. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
43
Influence of C:N, C:P ratios on rice straw biomethanation. 58th Annual Session of SLAAS, Dec 2002. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
44
Assessment of composition, volume of biogas liberation from agricultural wastes. 8th Annual Forestry Congress, Dec 2002, Hikkaduwa, Sri Lanka. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
45
Anaerobic digestion of rice straw in batch-type biogas generators as an option to compensate rural energy, fertilizer needs while mitigating methane emissions. 9th World Congress, Sep 2001, Antwerp, Belgium. (K.D.N. Weerasinghe, G.Y. Jayasinghe, L.A.Y. Dharshanie & W. Attanayaka)
46
Fertility enhancement of rice fields through application of anaerobically digested straw while mitigating methane emission. International Conference on Paddy Soil Fertility, Apr 2000, Philippines. (K.D.N. Weerasinghe, G.Y. Jayasinghe & L.A.Y. Dharshanie)
47
Biogas technology adoption to meet rural energy dem, , organic fertilizer needs. International Workshop, May 1999, Sri Lanka. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
48
Thesis: Influence of straw, by-products of biogas generators as fertilizer materials on growth, development of rice plant (B.Sc. Agriculture). Jan 1999. (G.Y. Jayasinghe)
49
Environmental Impact Assessment (EIA) report for Kakiri-Obada reservoir (flora, fauna impacts), Walasmulla. (G.Y. Jayasinghe & K.D.N. Weerasinghe)

Books / Book Chapters

Total: 2
01
Jayasinghe, G. Y., & Tokashiki, Y. (2010). Synthetic aggregates produced by different wastes as a soil ameliorant, a potting media component and a waste management option. In: Waste Management (INTECH Publishers, Vienna, Austria).
02
Jayasinghe, G. Y. (2011). Utilization of municipal solid waste compost in agriculture. In: Waste Management (INTECH Publishers).

Conference Publications

Total: 31
01
Influence of coal fly ash-based pellet aggregates addition on physicochemical properties of acidic soils in subtropical Okinawa, Japan,, their effect on the growth, nutrient content of Brassica campestris. Japanese Society of Soil Science and Plant Nutrition, 15–18 Sep 2009, Kyoto, Japan. (G.Y. Jayasinghe, Y. Tokashiki & M. Kitou)
02
Synthetic coal fly ash–paper waste aggregates as an option for waste management, a soil amendment to improve low productive soils. International Conference, Asian Institute of Technology, 5–7 Jan 2009, Bangkok, Thailand. (G.Y. Jayasinghe & Y. Tokashiki)
03
Utilization of bagasse sewage sludge based compost as a peat substitution for lettuce cultivation. Soil Science Society of America (SSSA), 1–5 Nov 2009, Pennsylvania, USA. (G.Y. Jayasinghe & Y. Tokashiki)
04
Substitution of peat with synthetic aggregates, bagasse sewage sludge based compost as a containerized media for crop production. R'09 Twin World Congress, 14–16 Sep 2009, Nagoya, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
05
Exploitation of coal fly ash based synthetic aggregates as a granular fertilizer medium, a soil amendment to improve crop production in low productive red soil in Okinawa, Japan. SSSA International Conference, 5–9 Oct 2008, Houston, Texas, USA. (G.Y. Jayasinghe & Y. Tokashiki)
06
Synthetic red soil paper waste aggregates as a potential soil amendment to enhance properties of problematic Jahgaru soils in Okinawa, Japan. Japanese Society of Soil Science and Plant Nutrition, 8–12 Sep 2008, Nagoya, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
07
Assessment, utilization of synthetic soil aggregates developed using coal fly ash, paper waste. American Society of Soil Science, 4–8 Dec 2007, New Orleans, USA. (G.Y. Jayasinghe & Y. Tokashiki)
08
Evaluation of the use of artificial zeolite, oil palm wastes as a substrate for crop production. Japanese Society of Soil Science and Plant Nutrition, 20–24 Aug 2007, Tokyo, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
09
Sustainable waste utilization to develop synthetic aggregates, their potential as a constituent of potting media. International Pacific Congress, 12–18 Jun 2007, Okinawa, Japan. (G.Y. Jayasinghe, Y. Tokashiki & M. Kitou)
10
Production, performance, micro-morphology of synthetic light weight soil aggregates developed using coal fly ash treated with starch as an organic binder. International Conference on Coal Science and Technology, 9–14 Oct 2005, Okinawa, Japan. (G.Y. Jayasinghe, Y. Tokashiki & L. Vidhana Arachchi)
11
Studies on improvement of rice straw biomethanation. International Conference on Recovery, Recycling and Re-integration, 25–29 Sep 2005, Beijing, China. (G.Y. Jayasinghe & L. Abegunawardana)
12
Influence of mixing synthetic lightweight aggregates developed using coal fly ash, used paper to amend Kunigami Mahji soils. Japanese Society of Soil Science and Plant Nutrition, 6–9 Sep 2005, Shimane, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
13
Development, exploitation of synthetic light weight soil aggregates produced by Kunigami Mahji soils with coal fly ash, used paper (in Japanese). JSSPN, 6–9 Sep 2005, Shimane, Japan. (Y. Tokashiki & G.Y. Jayasinghe)
14
Evaluation, utilization of synthetic soil aggregates developed using different waste materials. JSSPN, 5–8 Sep 2006, Akita, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
15
Agricultural, horticultural utilization of fly ash aggregates. 3rd Clean Coal Seminar, 5–7 Jul 2006, Okinawa, Japan. (G.Y. Jayasinghe & Y. Tokashiki)
16
Poster, stall in annual industrial exhibition, Naha, Okinawa, 3–10 Oct 2006. (G.Y. Jayasinghe & Y. Tokashiki)
17
Anaerobic digestion of rice straw in batch-type biogas generators as an option to compensate rural energy, fertilizer needs while mitigating methane emissions. 9th World Congress, Sep 2001, Antwerp, Belgium. (K.D.N. Weerasinghe, G.Y. Jayasinghe, L.A.Y. Dharshanie & W. Attanayaka)
18
Fertility enhancement of rice fields through application of anaerobically digested straw while mitigating methane emission. International Conference on Paddy Soil Fertility, Apr 2000, Philippines. (K.D.N. Weerasinghe, G.Y. Jayasinghe & L.A.Y. Dharshanie)
19
Biogas technology adoption to meet rural energy dem, , organic fertilizer needs. International Workshop, May 1999, Sri Lanka. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
20
Appropriate biogas generators for resource poor farmers in Sri Lanka to meet home energy, organic fertilizer needs. International Scientific Conference on Biogas Science, 2–4 Dec 2009, Erding, Germany. (K.D.N. Weerasinghe, S. Wijetunge & G.Y. Jayasinghe)
21
Thesis: Influence of straw, by-products of biogas generators as fertilizer materials on growth, development of rice plant (B.Sc. Agriculture). Jan 1999. (G.Y. Jayasinghe)
22
Influence of C:N, C:P ratios on rice straw biomethanation. 58th Annual Session of SLAAS, Dec 2002. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
23
Assessment of composition, volume of biogas liberation from agricultural wastes. 8th Annual Forestry Congress, Dec 2002, Hikkaduwa, Sri Lanka. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
24
Manipulation of methane, biogas production of rice straw biomethanation. 59th Annual Session of SLAAS, Dec 2003. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
25
Anaerobic digestion of market garbage, paddy straw to produce biogas, fertilizer as an environmentally friendly technique to manage solid waste. 9th Annual Forestry Congress, Jan 2004, Hikkaduwa. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
26
Consequences of C:N, C:P adjustments of rice straw on biomethanation in an anaerobic digester. 1st Academic Sessions, University of Ruhuna, Jul 2003. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
27
Environmental Impact Assessment (EIA) report for Kakiri-Obada reservoir (flora, fauna impacts), Walasmulla. (G.Y. Jayasinghe & K.D.N. Weerasinghe)
28
Design of a two-phase digester system to optimize biogasification of rice straw. 4th Academic Sessions, University of Ruhuna, 29 Jan 2007. (S. Wijetunge, N.E. Punchihewa, K.D.N. Weerasinghe & G.Y. Jayasinghe)
29
Utilization of agricultural waste compost as an alternative potting media component with coir dust for leafy vegetable Ipomoea aquatica. 8th Academic Sessions, University of Ruhuna, 22 Feb 2011. (W.K.R. Thushara & G.Y. Jayasinghe)
30
Synthetic aggregates as a potting media for ornamental plant production. 66th Annual Session of SLAAS, Dec 2010. (G.Y. Jayasinghe)
31
Potential utilization of composted sewage sludge in growth media for lettuce cultivation. International Symposium, Faculty of Agriculture, University of Ruhuna, 16 Nov 2010. (G.Y. Jayasinghe & Y. Tokashiki)