Bulletin of the Rubber Research Institute of Sri Lanka
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Item Cultivation of banana as an intercrop of rubber plantation(Rubber Research Institute of Sri Lanka. Agalawatte, 1989) Rodrigo, L.Item Use of organic materials as fertilizers(Rubber Research Institute of Sri Lanka. Agalawatte, 1987) Yogaratnam, N.Item Eppawela rock phosphate as a source of phosphorus for rubber(Rubber Research Institute of Sri Lanka. Agalawatte, 1987) Yogaratnam, N.; De Mel, GItem Plastochron indexes in Hevea brasiliensis growth under two water regimes(Rubber Research Institute of Sri Lanka. Agalawatte, 1987) Samarappuli, L.Rubber (Hevea brasiliensis) plants were grown in two water regimes, so that one treatment (wet plants) received water every other day and other treatment (dry plants) received water every seventh day, during the experimental period. In wet plants, plastochron indexes (PI) advanced more rapidly with time and final leaf size was greater (9.6 cm average). Diminished water supply appears to affect the rate of development and the sequence of developmental events, as observed when plastochron index was plotted against time and when leaf length was plotted against plastochron index of wet and dry treatments. It appears that the plastochron index could be used as a scale for studies connected with the effects of water availability on the development of Hevea brasiliensis.Item Leaf water potential and stomatal conductance of rubber (Hevea brasiliensis) as influenced by soil moisture and leaf age(Rubber Research Institute of Sri Lanka. Agalawatte, 1987) Samarappuli, L.Stomatal conductance and transpiration and leaf water potential of rubber (Hevea brasiliensis), clone PB 86, subjected to water stress were measured with a steady-state porometer and a pressure bomb, respectively. In well watered plants young leaves showed a higher stomatal conductance than mature leaves. In water stressed plants young leaves always exhibited a lower stomatal conductance than mature leaves. Increase in soil dehydration reduced the leaf water potential, stomatal conductance and the rate of transpiration.Item Developments in the manufacture of natural rubber(Rubber Research Institute of Sri Lanka. Agalawatta, 1987) Coomarasamy, A.Item Age of rubber uprooted and area of rubber replanted by smallholders in recent years(Rubber Research Institute of Sri Lanka. Agalawatta, 1986) Bandara, S.M.J.Item Farm size structure and land ownership according to crops by rubber smallholders(Rubber Research Institute of Sri Lanka. Agalawatta, 1986) Bandara, S.M.J.Item Assessment of the use of RRIC 100, RRIC 102 and RRIC 103 and their performance in the estate sector(Rubber Research Institute of Sri Lanka. Agalawatta, 1986) De Silva, S.; Talgaswatta, H.Item Role of quantitative genetics in the improvement of crop yields by controlled breeding(Rubber Research Institute of Sri Lanka. Agalawatta, 1985) Jayasekera, N.E.M.