Chemistry
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Item Ground water regime in Tsunami affected Southern coastal area of Sri Lanka(Sabaragamuwa University of Sri Lanka, 2006) Piyadasa, R.A.D.; Weerasinghe, K.D.N.; Liyanage, J.A.Item Physiochemical characteristics of ground water in out-skirt of Tsunami affected area; case study in Denipitiya, Southern Sri Lanka(Sabaragamuwa University of Sri Lanka, 2006) Weerasinghe, K.D.N.; Piyadasa, R.U.K.; Wijayawardhana, L.M.J.R.; Liyanage, J.A.Item Soil and groundwater salinity variation in Matara district coastal belt- Sri Lanka(Sri Lanka Association for the Advancement of Science, 2008) Dharmasena, T.H.Y.; Piyadasa, R.U.K.; Weerasinghe, K.D.N.; Liyanage, J.A.; Weerasinghe, W.A.D.C.S.The present research study identifies changes in salinity of soil and groundwater in tsunami affected and unaffected areas in Matara district. Within study area a total of 21 auger holes were drilled representing both tsunami affected and non-affected areas. The auger holes were distributed within approx 0.5 to 0.7 km distance from the coastline. Auger holes are selected to maintain perpendicular transacts to the coastal line. From each auger point, soil samples were taken from the surface layer and followed by each 50 cm depth until groundwater table is reached. Groundwater samples were also taken from auger holes and from dug wells near to auger holes. Soil physical parameters such as specific gravity, soil moisture, were determined. Soil chemical parameters such as pH, electrical conductivity (EC), total dissolved solids (TDS) and salinity were measured using pH and EC meters. The electrical conductivity (EC) of the soil in the tsunami affected area varied from 100 μS /cm to 422 μS/cm and groundwater salinity changed in between 400 to 2000 μS /cm. A direct relationship between EC and soil depth was detected. The prepared maps confirm that soil salinity, pH and EC variations were directly related with groundwater salinity. Additional salinity levels are related with morphological factors and soil physical parameters.Item Adaptation of hydroponics technology in Matara district –Case study in Beralapanathara(Sri Lanka Association for the Advancement of Science, 2008) Weerasinghe, K.D.N.; Abeysekara, I.K.; Chandima, H.H.; Wickramasinghe, I.; Liyanage, J.A.Department of Agric Engineering, Faculty of Agriculture, University of Ruhuna commenced an industrialization program of the Hydroponics technology developed by the Department for farmer groups in Beralapanathara along with SEEDS (Sarvodaya Economic Enterprise Development Services) and ITDG (Intermediate Technology Development Group of Sri Lanka) in 2001. Initially 10 farmers were grouped in to a company and technology was transformed to the members in the company by employing a Graduate for a period of one year, and providing necessary inputs, technology, and know how by the project. Present study was conducted from April to May in 2008 to assess the success of the program after seven years of its existence. The main objective of the study was to assess the economy of the Bell pepper and hydroponically grown Cucumber in Beralapanathara green houses. Survey results revealed that, at present total number of green houses in Beralapanathara were increased up to 16 by grouping 15 farmers. About 76.92 % of farmers have tunnel floor area over 1000 sq.ft; 23.08 % of farmers have floor area less than 1000 sq.ft. Majority of the green houses are dent shape and used the technology innovations for the construction. Bell pepper and Cucumber are the dominating vegetable crops that grown hydroponically in Beralapanathara green houses. 38.46 % of farmers grow only Bell pepper due to its high demand and high market price. Olympus, King Arther, Adino, Golden Bell and Twingo are the commonly grown Bell pepper varieties. Among them, King Arther is better adapted for the area and gives a higher yield compare to other varieties. Cucumber, variety Efdal and variety Sakura have better adoption to this area. Results revealed that, hydroponically grown Cucumber and Bell pepper in a 1000 sq.ft tunnel provides more profit compare to tea. Limiting factor for further expansion of Cucumber appears to be the transport problem, even though profit gain from Cucumber is twice that of the Bell pepper.Item Usage of groundwater resources in some tsunami affected areas of the Indian Ocean tsunami after 2 years: a case study from Southern Sri Lanka(Sri Lanka Association for the Advancement of Science, 2009) Wijayawardhana, L.M.J.R.; Piyadara, R.U.K.; Weerasinghe, K.D.N.; Liyanage, J.A.Item Identification and mapping the distribution of water quality parameters in Gandara Devinuwara area in Matara district(Sri Lanka Association for the Advancement of Science, 2009) Chandena, C.G.; Piyadara, R.U.K.; Weerasinghe, K.D.N.; Liyanage, J.A.Item Groundwater potential assessment after the tsunami destruction in southern coastal belt of Matara district, Sri Lanka(National Aquatic Resources Research and Development Agency, 2007) Piyadasa, R.U.K.; Weerasinghe, K.D.N.; Liyanage, J.A.; Wijayawardhane, L.M.J.R.; Priyantha, S.M.P.D.; Konara, S.Item Development and characterization of hydroponics solution for bell pepper(Sri Lanka Association for the Advancement of Science, 2005) Ratnaweera, D.R.; Liyanage, J.A.; Weerasinghe, K.D.N.Item Performance assessment of bell pepper (Capsicum annum) in newly formatted hydroponics nutrient solution by two different production systems(Sri Lanka Association for the Advancement of Science, 2005) Abeyrathna, H.M.W.N.; Kariyawasam, I.S.; Jinendra, B.M.S.; Weerasinghe, K.D.N.; Liyanage, J.A.Item Performance of salad cucumber (Cucumis sativus) in a newly formulated hydroponics nutrient solution in two different growing media under protected house conditions(Sri Lanka Association for the Advancement of Science, 2006) Kumari, W.G.S.P.; Weerasinghe, K.D.N.; Liyanage, J.A.; Kariyawasam, I.S.