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Item Effect of recovery tapping on yield potential of rubber (Hevea brasiliensis) trees(Rubber Research Institute:Agalawatta, 2001) Silva, T.U.K.; Nugawela, A.; Rodrigo, V.H.L.; Serasinghe, P.Item Rubber cum sugarcane intercropping. a sustainable cropping system for farmers in the intermediate zone of Sri Lanka(Rubber Research Institute:Agalawatta, 2000) Rodrigo, V.H.L.; Nugawela, A.; Sivanathan, A.; Witharama, W.R.G.; Jayasinghe, W.K.Item Shade effects on photosynthesis of cinnamon (Cinnamomum verum J. Pres)(Rubber Research Institute:Agalawatta, 1998) Pathirana, L.S.S.; Nugawela, A.; Samarasekera, R.K.Item Shade effects on photosynthesis of cinnamon (Cinnamomum verum J. Pres)(Rubber Research Institute:Agalawatta, 1998) Pathirana, L.S.S.; Nugawela, A.; Samarasekera, R.K.Item The effect of tapping on the assimilation rates of Hevea brasiliensis Muell. Arg. leaves(Rubber Research Institute:Agalawatta, 1990) Nugawela, A.; Aluthhewage, R.K.The CO2 assimilation rates at leaf level were compared in tapped and untaped trees of two Hevea brasiliensis genotypes. In both genotypes, the CO2 assimilation rates of the leaves in the upper stratum were lower in tapped trees. Simmilary, in young microtapped plants the CO2 assimilation rates were lower than in the untapped plants. The decrease in CO2 assimilation rates due to tapping cannot be attributed to an increase in either stomatal or mesophyll limitations. Tapping increases the sink demand for photo assimilates, but it also results in the loss of water, inorganic nutrients and proteins from the plant. Loss of water, inorganic nutrients may results in lower CO2 assimilation rates of the tapped trees. In the long-term this could result in lower sucrose content in the latex. This may be a probable cause for the physiological disorder, tapping panel dryness in rubber.Item An economic evaluation of the use of rainguards(Rubber Research Institute:Agalawatta, 1993) Rodrigo, V.H.L.; Herath, P.H.M.U.; Nugawela, A.Use of rainguards can minimize the loss of tappping days and hence the loss in rubber crop. A simple model was developed to study different components determinig the profitability of using rainguard is discussed. Price of rubber, yield potential of a plant and tapping wage rate were identified as most important factors which determine the worthiness of the use of rainguards. Sealent price is also a major factor in deciding profitability. If the price of scalent is less than Rs. 20/= per kg, the profilability from both the apron and the gutter types is sameItem Rubber research in Sri Lanka-the past 100 years and the future(Rubber Research Institue:Agalawatta, 2010) Nugawela, A.Item Increasing productivity. a tool to mitigate adverse impacts of wage hikes on the performance of plantations(Rubber Research Institute:Agalawatta, 2010) Nugawela, A.Item Rubber growers need to be proactive to conquer the adverse effects of volatile trading conditions(Rubber Research Institute:Agalawatta, 2010) Nugawela, A.Item Scientists arm the rubber plant to successfully conquer the 300M elevation barrier(Rubber Research Institute of Sri Lanka:Agalawatta, 2009) Nugawela, A.