Bulletin of the Rubber Research Institute of Sri Lanka
Permanent URI for this collectionhttps://dl.nsf.gov.lk/handle/1/9047
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Item Soil and foliar sampling technique for discriminatory fertilizer recommendation for rubber(Rubber Research Institute of Sri Lanka. Agalawatta, 1993) Samarappuli, L.; Dissnayake, A.Item EL-NINO. its effects on rubber plantations(Rubber Research Institute of Sri Lanka. Agalawatta, 1998) Samarappuli, L.Item Root development in Hevea brasiliensis(Rubber Research Instutite. Agalawatte, 1996) Samarappuli, L.Item The contribution of rubber plantations towards a better environment(Rubber Research Institute. Agalawatte, 1996) Samarappuli, L.Item Mulching with paddy straw. to reduce immaturity and improve yeilds(Rubber Research Institute of Sri Lanka. Agalawatta, 1995) Samarappuli, L.Item Weed control in rubber plantations(Rubber Research Institute of Sri Lanka. Agalawatta, 1991) Yogaratnam, N.; Samarappuli, L.; Dissanayake, D.M.A.P.Item 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 Rubber to rescue adverse environmental impacts(Rubber Research Institute of Sri Lanka. Agalawatta, 2009) Samarappuli, L.; Wijesuriya, W.Item Potassium. its status in rubber growing soil of Sri Lanka(Rubber Research Institute. Agalawatte, 2004) Samarappuli, L.; Edirimanna, V.; Thevarapperuma, A.