Journal of the Rubber Research Institute of Sri Lanka
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Item Field performance of young coffee seedlings and cuttings intercropped with rubber(Rubber Research Institute. Agalawatta, 1988) Rodrigo, V.H.L.; Nugawela, A.; Kariyawasam, L.S.; Aluthhewage, R.K.Coffee may be planted either using seedlings or cuttings. Anyhow, a comparative study of their field establishment and performance has not been made. Iin this study seedlings and cuttings of Coffea canephora intercropped with rubber were compared for their field stablishment and growth. It is evident that there is no difference in the success of their field establishment. The dry matter yield determinants of plants, i. e. light intercept ion, conversion efficiency and rate of loss of dry matter, estimated by total leaf area, CO2 assimilation rate and dark respiratory rate respectively, are also similar in both seedlings and cuttings. This is confirmed by the similar mean total dry weight of a seedlings and a cuttings. The partitioning of assimilates is more towards root development in the cuttings and is evident by the significantly high root dry weight and the root/shoot ratio. The percentage of assimilates partitioning towards the growth of aerial parts is less in the cuttings, i. e. 52 and 67perc. for cuttings and seedlings respectively. Despite of similar light levels, the CO2 assimilation rates are lower in the afternoon in both seedlings and cuttings. The perc. deeline is 23.5 and 18.6perc. for seedlings and cuttings respectively.Item Feasibility of rubber (Hevea brasiliensis Muell.Arg.) cultivation in Eastern province of Sri Lanka with the peasant community(Rubber Research Institute. Agalawatta, 2010) Iqbal, S.M.M.; Rodrigo, V.H.L.; Karunathilake, P.K.W.Item High density banana/rubber intercrops have no negative effects component crops under the smallholder conditions(Rubber Research Institute. Agalawatta, 2010) Senevirathna, A.M.W.K.; Striling, C.M.; Rodrigo, V.H.L.; Pathirana, P.D.; Karunathilake, P.K.W.Item Local knowledge in rubber (Hevea brasiliensis) farming systems in Sri Lanka. applications and constraints(Rubber Research Institute. Agalawatta, 2010) Senevirathna, A.M.W.K.; Pathirana, P.D.; Rodrigo, V.H.L.; Sinclair, F.L.Item Effect of different light regimes on above and below ground development of Hevea brasiliensis during early stage of growth(Rubber Research Institute. Agalawatta, 2009) Senevirathna, A.M.W.K.; Karunatillake, P.K.W.; Pathirana, P.D.; Rodrigo, V.H.L.Item Rural livelihood and rubber cultivation in eastern province of Sri Lanka(Rubber Research Institute of Sri Lanka. Agalawatte, 2009) Rodrigo, V.H.L.; Iqbal, S.M.M.; Munasinghe, E.G.Item Effect of planting density on growth, yield related factors and profitability of rubber (Hevea brasiliensis Muell.Arg.)(Rubber Research Institute of Sri Lanka. Agalawatte, 1995) Rodrigo, V.H.L.;Data available on an experiment on planting density of rubber in Kalutara region of Sri Lanka were analyzed in view of investigating how planting density affects yield, yield related factors and financial return. Experimenet comprised six planting densities from 400 to 920 trees per hectare and three clones PB 86, RRIC 101 and RRIC 103. Planting density has affected plant girth of all clones from fourth year onwards. Density effect on girth of RRIC 101 was higher than that of other clones. With increasing planting density bark thickness and number of latex vessel rings declined in all clones and relatively more marked in clone RRIC 101. Similarly, yield per tree per tapping decreased, but yield per hectare per tapping and net present value increased with the increase in density. Nevertheless, with only two years of yield data and also without knowing number of tapping days for each density tested, it is not possible to arrive at definite conclusions. Less variation in girth increment among different densities towards later stage of plant growth indicates that apparent effect of density in this stage could be a cumulative effect over the period but not the effect of this stage. No density effect on canopy light interception was evident. Available data justifies further investigations and it is suggested that more adoptability trials located in different agro-climatic regions are to be conducted using new clones before arriving at definite conclusions. In these srudies due consideration should be given to tappable stand, incidence of tapping panel dryness and tapping days.Item Adoption of different tapping systems in the rubber industry of Sri Lanka with special reference to low frequency tapping(Rubber Research Institute . Agalawatta, 2007) Rodrigo, V.H.L.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 Rubber/timer intercropping systems and their impact on the performance of rubber(Rubber Research Institute. Agalawatta, 2002) Rodrigo, V.H.L.; Silva, T.U.K.; Kariyawasam, L.S.; Munasinghe, E.S.