Journal of the Rubber Research Institute of Sri Lanka
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Item Acclimatization of micropropagated plants of Hevea(Rubber Research Institute. Agalawatta, 1993) Seneviratne, P.; Wijesekera, G.A.S.; De Soysa, G.M.In vitro produced Hevea shoots were successfully acclimatized to outdoor conditions by controlling the ambient conditions, mainly the humidity. Shooots, longer than 5 cm and with some leaves attached performed better. Shoots without roots produced shoots soon after their transfer to soil and the root development and the acclimation succes was better than in the rooted shoots. Use of a concentrated auxin solution, to soak the bases of the shoots or to incoroperate into soil improved root induction. The growth of the aerial part and the root system of the micropropagated plants were comparable to those of embryo cultured plants, up to one year of growth, but the field performance is yet to be monitored.Item Accumulation of free proline in bark and latex of Hevea brasiliensis affected by brown bast(Rubber Research Institute. Agalawatta, 1986) Wickramasinghe, S.I.; Yapa, P.A.J.; De Soysa, T.V.W.Free proline accumulation in clone RRIC 101 of Hevea brasiliensis was investigated. The bark and the latex samples collected from both healthy and brown bast effected trees were analysed for free prline content. The average bark proline concentration/unit present in the brown bast trees was found to be considerable higher (P = 0.10) than that of healthy trees. The accumulation of free proline in latex was found to be significant in brown bast trees.Item Adaptability of recently recommended rubber clones for agro-climatic variability of Sri Lanka(Rubber Research Institute . Agalawatta, 2005) Withanage, S.P.; Attanayake, D.P.S.T.G.; Karunasekera, K.B.A.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 Agronomic and economic benefits of high density banana intercropping during the immature period of rubber with particular emphasis on smallholders(Rubber Research Institute. Agalawatta, 2000) Rodrigo, V.H.L.; Stirling, C.M.; Samarasekera, R.K.; Kariyawasam, L.S.; Pathirana, P.D.Item Agronomic and economic viability of rubber (Hevea brasiliensis Muell. Arg.) cinnamon (cinnamonum verum J Pres.) intercropping systems involving wider inter -row spacing in rubber plantations(Rubber Research Institute. Agalawatta, 2003) Pathiratna, L.S.S.; Edirisinghe, J.C.Item An analysis of growth patterns of Hevea clones(Rubber Research Institute. Agalawatta, 1988) Margret, H.A.W.; Abeyasekera, S.; Jayasekera, N.E.M.Four girth measurements collected over four years, before tapping from ten Hevea clones grown in two sites have been analysed to study the growth pattern. Year to year variation in both sites was mainly due t linear component of growth. Growth of individual clones too was mainly due to linear effect. But some clones in one site showed significant quadratic and or cubic component. This was due to non linear growth of plants in some plots. Ten clones have been groued (a) according to the when averaged over four years so that clones within a group have the same average girth and (b) on the gradient of the regression fitted to the girth measurement increasing over the four years. RRIC 52 had the fastest growth in both sites. RRIC 103 had the same growth rates in both sites suggesting that it has a greater stability to local environmental changes.Item Analysis of ranking exercises in participatory rural appraisal (PRA). a case study from the smallholder rubber sector(Rubber Research Institute. Agalawatta, 2005) Wijesuriya, W.; Thattil, R.O.Item Antimucin - a new water miscible fungicide for the control of black stripe(Rubber Research Institute. Agalawatta, 1959) Riggenbach, A.Item The biotic effect of the surface microflora on phytophthora meadii infection of rubber petioles(Rubber Research Institute . Agalawatta, 2002) Jayasinghe, K.E.; Wijesundera, R.L.C.; Thennakoon, B.I.; Silva, N.Item Breaking dormancy in seeds of cover legumes(Rubber Research Institute of Sri Lanka. Agalawaththa, 1976) Waidyanatha, U.P. de S.; Ariyaratne, W.A.Item Can tapping panel dryness of rubber (Hevea brasiliensis) be minimised at field level with better management?(Rubber Research Institute . Agalawatta, 2007) Senevirathna, A.M.W.K.; Wilbert, S.; Perera, S.A.P.S.; Wijesinghe, A.K.H.S.Item Cell wall degrading enzyme secretion by Cylindrocladium quinqueseptatum(Rubber Research Institute. Agalawatta, 1999) Jayasinghe, C.K.; Wijesundera, R.L.C.Cylindrocladium quinqueseptatum causes leaf fall of clove in Sri Lanka and is responsible for the leaf spots of rubber in Malaysia.only one isolate (KP)from four pathogenic isolates examined secreted polygalacturanase(PG) when grown in liquid media.None ofthe isolates secreted pectin lyase(PL).The extracts of clove and rubber leaf tissues,inoculated with the KP isolate did not show any PG and PL activity .The leaf tissue did not have the ability to ingibit c.quinqueseptatum PG produced in culture.All isolates of C.quinquesepltatum secreted cellulases viz.cellobiase and b-glucosidase in culture.cellobiase was detected in the inoculated rubber leaves,The levels of B-glucosidase,an ingerent enzyme of Hevea leaves,also increased rapidly following infection.The results indicate that pectic enxymes play a minimal or no role in disease developmet of C.quinqueseptatum infecton in cloves and Hevea.Thus cellulolyic enzyme probably play a nutritive role.Item Cinnamon (Cinnamomum verum J. Pres) intercropped under different inter row spacings of rubber (Hevea brasiliensis Muell. Arg.). performance after rubber reached maturity(Rubber Research Institute . Agalawatta, 2007) Pathiratna, L.S.S.; Perera, M.K.P.; Balasooriya, C.K.Item Clonal differences in growth parameters of young Hevea buddings and their relation to field performance(Rubber Research Institute. Agalawatta, 1986) Nugawela, A.; Aluthhewage, R.K.Hevea trees when tapped exhibited a depression of girth increment and canopy growth. Hence a high growth rate is required to maintain the growth whilst giving a high yield. Growth parameters of 5 Hevea clonal buddings were determined after different growth intervals viz., 3, 6 , 9, and 12 months to study the correlation they show with the field performance of the same clones. Clonal differences were significant, but did not necessarily correlate with the field performance. Growth rates gradually increased with age during the peeriod of investigatiion. Thepossibility of using growth parameters together with gas exchange capacities determinedin earlier studies in predicting later field performance are discussed.Item Clonal differences in rock phosphate utilization by Hevea(Rubber Research Institute. Agalawatta, 1991) Dissanayake, D.M.A.P.; Dissanayake, T.; Gunasekera, R.; Jayasekera, S.Genotypic variability in utilization of rock phosphates including the local source Eppawale was evaluated using Hevea clones during the early immature phase. All the clones responded to P fertilization, and the responces were related to the source of fertilizers and other soil characteristics. Plants of clone RR1C 121 utilized Eppawala rock phosphate efficiently, both in Matale and Boralu soil. But, plants of clone RR1C 110 were able to use both rock phosphate sources only in Matale soils. However, responce to rock phosphate from plants of 100 was comparatively low in relation to P uptake and dry matter production. The necessity of testing these clones for the locally available phosphate source in the field scale is also discussedItem A comparative study of Colletotrichum species causing anthracnose in Hevea(Rubber Research Institute. Agalawatta, 2009) Jayasinghe, C.K.; Fernando, T.H.P.S.; Jayawardana, N.Item Comparison of the effectiveness of liquid and granule fertilizer mixtures on rubber plants raised by young budding technique(Rubber Research Institute. Agalawatta, 1997) Dharmakeerthi, R.S.; Yogaratnam, N.Y.; Samarappuli, L.; Silva, S.N.; Yakandawala, A.Effectiveness of granule fertilizer mixtures was compared with currently used liquid formulations on plants raised by young budding technique.Granule formulations are agronomicaly effective provided that they are applied in small quantities.Urea based mixtures was found to be comparatively mire detrimental than sulfate of ammonia based mixtures when used at concentrations higher than the recomended levels.Currently recommended fertilizer schedule with liquid formulations was the most effective programme for young budding among the treatments tested.Reduced frequency of application increased the deiback percentage significantly.However,it could be applied at two-week intervals instead of weekly intervals equally effectively,thereby reducing the application cost almost by half.Item Comparison of yields between budgrafts and mother trees in Hevea brasiliensis Muell. Arg.(Rubber Research Institute . Agalawatta, 2007) Pathiratna, L.S.S.; Wijesuriya, W.; Seneviratne, P.Item Contour and East -West row planting systems of rubber (Hevea) for intercropping . part ii distrubution of fine roots in the inter row space(Rubber Research Institute. Agalawatta, 2003) Pathiratna, L.S.S.; Perera, M.K.P.