4.Journals Published in Sri Lanka

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Author: search.filters.author.Fernando, W.M.U.Has files: Yes

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    Patterns of genetic differentiation in perennial ryegrass (Lolium perenne L.) populations sampled from different geographical areas in Europe
    (Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1992) Fernando, W.M.U.; Hayward, M.D.; Kearsey, M.J.
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    Variation in seedling characters of three different coconut cultivars and their use in identification in the nusery
    (CRI, 1991-93) Fernando, W.M.U.; Pieris, T.S.G.; Wickramaratne, M.R.T.
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    Effect of planting density on the yield of coconut
    (Coconut Research Institute. Lunuwila, 1996) Fernando, W.M.U.; Bandaranayake, C.K.
    An analyses is presented of the yield components of coconut established under densities varying from 128 palms/ha to 239 palms/ha from a spacing trial conducted by the Coconut Research Institute. Analysis of yield data during 1976-1980 from 24 palms from 4 replicates analysed for each density treatment revealed significant differences in nuts/palm and copra/palm for the densities tested. The nuts/palm decreased with increasing density but the yield/ha, maximised at a density of 171 palms/ha and decreased beyond 171. Significant differnces were absent inyield of copra/nut for the densities tested. The differences in copra/palm were due to the effect of nut number/palm. At a densityof 179 palms/ha, copra/ha maximised to 2260 kg and decreased beyond 179. The results of the present analysis indicate that a density ranging from 171-179 palms per hectare is the optimum for planting coconut in dry-intermediate zone where the study was conducted.
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    Genetic improvement of the coconut cultivar san Ramon
    (Coconut Research Institute. Lunuwila, 1998/1999) Fernando, W.M.U.
    The tall form of coconut, San Ramon was imported to Sri Lanka from the Philippines and was first established in the North Western province. The open pollinated seed obtained from the first introduction and planted at the Coconut Research Institute (CRI) from the genetic base for SanRamon improvement at present. This cultivar inherits the potential of producing 51%more copra per nut than Sri Lanka tall palms and 50% more copra per nut than the improved tall, CRIC 60. The mean copra yield per nut recorded for San Ramon (selfed), Sri Lanka tall and CRIC 60 was 371g, 240g and 246g respectively. Preliminary investigations have shown that the oil extraction efficiency of copra is 776 ml per Kg of copra for tall x San Ramon whilst for both Sri Lanka tall and CRIC 60, it is 740 ml. The results of this study strongly justify the use of San Ramon and its corsses for copra and oil industry in Sri Lanka
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    Genetic control of husked nut weight in coconut (Cocos nucifera)
    (Coconut Research Institute. Lunuwila, 1996) Fernando, W.M.U.
    The genetic control of husked nut weight in coconut (Cocos nucifera) was investigated using a full-diallel cross including eight parents. The parents were selected sample of palms which gave an annual mean yield of 23 kg of copra per palm with 713 gm of husked nut weight over five years. An average of five progenies per cross planted in a fully randomised designed were evaluated for five years. Husked nut weight of five nuts per palm was recorded at each pick. Analysis of variance of mean husked nut weight confirmed the presence of additive and non additive genetic variance to the total phenotypic variance was 0.45. Of the dominance components, directional dominance was non significant. Neither the presence of heterosis nor inbreeding depression was consistent among the selfed and crossed progenies elucidating the fact that not only crossing but selfing could also improve the trait, depending on the genetic constitution of the individual. Reciprocal differences were evident in the crosses suggesting the importance of the direction of cross.