41 results
Search Results
Now showing 1 - 10 of 41
Item Seed production of clones PB 86, RRIC 100 and RRIC 121 in three rubber growing areas of Sri Lanka(Rubber Research Institute. Agalawatta, 1997) Seneviratne, P.; Nugawela, A.; Amaratunge, K.A.G.B.; Karunasena, R.P.; Wilbert, S.The rubber seed production in wet rubber growing areas in Sri Lanka has gone to very low levels in the recent past affecting the culling process that should be adopted in establishing rootstock nurseries.From the three rubber growing areas studied satisfacton seed production irrespective of the clone was observed only in Kegalle region.Regional differences may be due to direct or influences of the climate and weather during flowering and pod set. Clonal differences seems to be existing in regions where climate or the weather is favourable for spread of diseases.Further RRIC 100 being a resistant clone for oidum and phytopthora.produced a higher percemage of good quality seeds compared with the other two clones.PB 86 and RRIC 121 which have below average tolerance to these two diseases.However currently country as a whole produces enough seeds to fulfill country's annual seed requirement for the production of rootstocks provided the seeds are collected and transported without delayItem Factors affecting the budgrafting success and the scion growth of young budding of Hevea(Rubber Research Institute. Agalawatta, 1994) Seneviratne, P.; Nugawela, A.; Samarakoon, S.M.A.The size of the bag in which the stock plant is grown seems to have an effect on the growth of the seedling; from the three bag sizes tested, ie 15 x33 cm, 18 x 38 cm, 23 x 45 cm, it was found that the diameter the number of leaf whorls of the seedling increased with the increase of the bag size.Though the differences are not statistically significant, the budding success too increased in the same pattern. There was no effect of the bag size on the growth of the scion. The two types of buds, axillary scale, showed no difference either on bud grafting success or on the growth of the scion. The growth stage of the top most leaf whorl of the stock plant, either mature or immature, had no effect on the peeling qualities budgrafting success though a little higher budgrafting success was seen when the top flush was immature. There was an effect of the snag, on the scion growth; when the snag was shorter the sprouting took place earlier but, the scion growth was slightly poor as was evident by the diameter the length of the scion. Long snags delayed the sprouting , but the scion growth was better. The best growth of the scion was obtained when the snag was long with a few leaves attached to it.Item Improvements in total production and productivity in the rubber plantations(Rubber Research Institute of Sri Lanka. Agalawatta, 2000) Nugawela, A.Item The importance of selecting planting materials at nursery stage(Rubber Research Institute of Sri Lanka. Agalawatta, 1996) Seneviratne, P.; Nugawela, A.; Ramawickrama, D.Item How and why the intake of a tapper should be increased(Rubber Research Institute of Sri Lanka. Agalawatta, 1998) Nugawela, A.Item Possible trends in the plantation sector of Sri Lanka(Rubber Research Institute of Sri Lanka. Agalawatta, 2002) Nugawela, A.Item Exploitation systems for some hevea brasiliensis muell arg clones for improved economic performance(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2002) Gunasekera, H.K.L.K.; Nugawela, A.; de Costa, W.A.J.M.; Attanayake, D.P.S.T.G.Item The crop loss due to wet weather and methods to overcome it(Rubber Research Institute. Agalawatta, 1999) Nugawela, A.Item Stimulation of rubber trees for enhancing performance - the past, current practices and future trends(Rubber Research Institute of Sri Lanka. Agalawatta, 2006) Nugawela, A.Item Rubber prices and their impact on the industry(Rubber Research Institute of Sri Lanka. Agalawatta, 2002) Nugawela, A.