Journal of the Rubber Research Institute of Sri Lanka

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    Export performance of rubber products manufacturing sector in Sri Lanka
    (Rubber Research Institute:Agalawatta, 2013) Sankalpa, J.K.S.; Wijesuriya, W.; Jeewanthi, P.W.
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    Evaluation of d/3 tapping with stimulation to alleviate problems related to d/2 tapping of Hevea
    (Rubber Research Institute. Agalawatta, 2000) Nugewela, A.; Peries, M.R.C.; Wijesekera, S.; Samarasekera, R.K.
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    The economics of rubber replanting cycles. an interpretive essay
    (Rubber Research Institute. Agalawatta, 1977) Etherington, D.M.; Jayasuriya, S.K.W.
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    Some biases in the generators of technologies by Rubber Research Institute
    (Rubber Research Institute. Agalawatta, 1977) Barlow, C.; Peries, O.S.
    This paper considers the distortion in economic use of resources flowing from the generation of partly inappropriate techniques and technologies. This distortion comes to the situation of smallholdings. As an introduction to the paper some pertinent economics concepts are discussed. A review is made of past research in the major rubber producting countries, and highlights the almost exclusive concentration until recently on techniques and technologies suitable for estate conditions. Some specific examples of bias are reviewed in detail and desirable economic adjustment, in application to the circumstance of smallholdings, are suggested. The examples of major concern involve research on tapping systems, and on planting methods including the specific aspects of tree planting densities, intercropping and wedding. There is also the overall problem that the basic levels of input use on rubber research stations are usually inappropriate to realistic experimentation on the problems of smallholders. It is believed that a better adaptation of available techniques and technologies to the situation of rubber smallholdings can produce substantial economic benefits.
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    The specification and estimation of a production function for smallholding rubber in Sri Lanka
    (Rubber Research Institute. Agalawatta, 1977) Chandrasiri, G.R.; Carrad, B.; Teo, C.K.; Weerasinghe, S.
    An attempt is made to analyse the main input/output relationship in a cross-section of smallholdings growing high yielding rubber in the Matugama and Agalawatte areas of Sri Lanka. It follows from the rsults reported by Barlow et al. (1975) of the 1971 survey of these holdings. The factors found to have most impact on output were tree age, planting density, area of mature rubber and tapping frequency. Specification problems associated with these variables and with rubber, as a perennial crop, are discussed. Two main types of clones Tjir 1 and PB 86 were grown on these holdings and a comparison of their performance wasmade. Similarly, the sample has been divided by the number and type (family or hired) of labour employed in evaluating the performance of the various hldings in the sample. Throughout this paper the Cobb-Douglas production function approach was followed.
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    Management of covers under Hevea in Sri Lanka
    (Rubber Research Institute. Agalawatta, 1977) Yogaratnam, N.; Sulaiman, H.; Karunaratne, A.D.M.; Peiris, K.S.A.C.
    Results of two experiments, comparing the effects of leguminous creepers and naturals as ground covers on growth of immature rubber, are discussed. In one experiment the growthof rubber in plots under pure legume covers was better than that under naturals. Applications of extra nitrogen to trees in plots with natural covers improved their growth but the latter was not comparable to that in legume plots. In the pther experiments the increase in growth of rubber with higher levels of fertiliser nitrogen was observed irrespective of the type of cover. Application of phosphate to covers led to better tree girths than where the phosphate was applied on the trees, irrespective of the type of cover grown. These results are discussed in relation to the nitrogen content of rubber eaves, green matter, litter and C/N ratio of the litter of cover.