Browsing by Author "Wickremasinghe, W.N."
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Item Error reduction in field experiments on Hevea using covariance techniques and effective blocking(Rubber Research Institute. Agalawatta, 1980) Wickremasinghe, W.N.; Abayapala, R.A.P.Item Error reduction in field experiments on Hevea using covariance techniques and effective blocking(Rubber Research Institute:Agalawatta, 1980) Wickremasinghe, W.N.; Abayapala, R.A.P.Item On the estimation of leaf areas of some selected Hevea clones(Rubber research Institute. Agalawatte, 1984) Wickremasinghe, W.N.; Samaranayake, C.; Abayapala, R.A.P.Item Relationship between the incidence and severity of colletotrichum gloeosporioides leaf disease in hevea brasilliensis(Rubber Research Institute:Agalawatta, 1985) Samaradeewa, P.K.; Liyanage, A.D.S.; Wickremasinghe, W.N.Item Relationship between the incidence and severity of colletotrichum gloeosporioides leaf disease in hevea brasilliensis(Rubber Research Institute. Agalawatta, 1985) Samaradeewa, P.K.; Liyanage, A.D.S.; Wickremasinghe, W.N.Item Variations involved in field measurements of transpiration rates and stomatal diffusive resistance of Hevea brasiliensis Muell. Arg. clones and the relationship of the latter with net photosynthetic rates(Rubber research Institute. Agalawatte, 1984) Nugawela, A.; Wickremasinghe, W.N.; Aluthhewage, R.K.Variance components and their percentage contribution to total variation during field measurements of stomatal diffusive resistance (DR) and transpiration rates (TR) were studied for Hevea clones. Variance from the plant component was much higher than other components viz., leaves of the same plant and determinations of the same leaf. DR, TRand coefficient of varian for DR and TR varied significantly with leaf age and time of the day. The three leaflets in a leaf were similar in respects to DR and TR. Within a whorl, the comparatively smalle leaves at the top of differed significantly withrespect to DR and TR from the rest. DR and Tr of clones RRIC 100, RRIC 103, RRIC 45, PB 86 and IAN 710 were significantly different at 0.1perc. level. Initial studies show stomatal diffusive resistance to have a tendancy to be correlated with net photosynthetic rates (NPR). Other possible factors that might bring about clonal differences in NPR are discussed.