COCOS - Journal of the Coconut Research Institute of Sri Lanka
Permanent URI for this collectionhttps://dl.nsf.gov.lk/handle/1/7343
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Item A survey of land for Weligama coconut leaf wilt disease affected palms outside the declared boundary in the Southern Province(Coconut Research Institute:Lunuwila, 2016) Nainanayake, A.D.; Kumarathunga, M.D.P.; De Silva, P.H.P.R.Item An alternative approach for analysis of data from a long-term experiment(CRI, 1989) Peiris, T.S.G.; Seneviratne, E.K.Item Alternative methods to determine plot sizes for tree crops. a case study from coconut data(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Peiris, T.S.G.; Thattil, R.O.Two methodologies are pooposed to determine the most efficient plot size for tree crops using data from experiments based on randomized complete block designs. Both methods can be generalized for data from any balanced design. The merits and demerits of these methods are discussed. The methods are illustrated using the data sets of long-term field ecperiments at the Coconut Research Institute, Sri Lanka. The results show that efficient plot size in field experiments for coconut for a wide range of agroecological regions is four or six palms.Item An alternative model to estimate solar radiation(Coconut Research Institute of Sri Lanka. Lunuwila, 1994-95) Peiris, T.S.G.; Thattil, R.O.Solar radiation is extremely useful in modelling many agricultural applications, but is hardly used due to the difficulty in obtaining data, and the time consuming process in estimating it by the angstrom (1924) formula which uses world geographical relationships. To estimate solar radiation at the Coconut Research institute, Lunuwila (7o 20'N;71o 53'E;30.5m) an alternative model was developed from measured sunshine hours data only. The model had good fit (R2=0.90,P0.001) and was found to have agreement with the estimates obtained from the Angstrom model. The alternative model is more flexible and useful in estimating crop evapotranspiration, and for crop-weather modelling. The mean daily solar radiation at Lunuwila was estimated to be 18.3 MJ m-2d-1 and the total annual solar radiation receipts is 6680 MJ m-2 (66.8 TJ ha-1). The monthly solar radiation was highest in March (21.7MJ m-2 d-1) and the estimated 75 per cent probability value was 22.5 June had the lowest (16.1 MJ m-2 d-1) value and the estimated 75 per cent probability value was 17.8.Item An Empirical Investigation on the Effect of Land Size on its Productivity of Coconut Plantations in Sri Lanka(Coconut Research Institute:Lunuwila, 2010) Jayalath, K.V.N.N.; Pathiraja, P.M.E.K.; Jayasinghe-Mudalige, U.K.; Fernando, M.T.N.Item Approach to screen coconut varieties for high temperature tolerance by in-vitro pollen germination(Coconut Research Institute. Lunuwila, 2010) Ranasinghe, C.S.; Waidyarathna, K.P.; Pradeep, A.P.C.; Meneripitiya, M.S.K.Item Assessing the performance of fruit colour based phenotypes of tall (Typica) coconuts (Cocos nucifera L.) in Sri Lanka(Coconut Research Institute:Lunuwila, 2016) Perera, S.A.C.N.; Kumarasinghe, W.M.; Gunasekara, T.M.C.P.Item An assessment of labour availability in major coconut growing areas in coconut triangle(Coconut Research Institute. Lunuwila, 2010) Pathiraja, P.M.E.K.; Fernando, M.T.N.; Abeysekara, A.W.A.D.R.; Subasinghe, S.D.J.N.Item Assessment of the effects of environmental factors on yield of coconut (Cocos nucifera L.)(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Peiris, T.S.G.; Thattil, R.O.The long term nut yield data and climate data of eight variables (1976-1992) were analyzed to understand the effects of climate and weather on the yield variability between picks. The yield variation over the years had no systematic pattern. The order of contribution of the picks to total yield is not significantly consistent between years. Explanatory models were developed at monthly lag periods prior to harvest of each pick. The most and least influential picks in respect of climate variability are picks 5 and 2 respectively. The critical period with respect to climate and weather variability of picks 1-6 are February , June July, Septermber, December and February respectively. The climatic models fitted at these periods explain the yield variability between picks. The influence of climatic variables during these periods vary from pick to pick. Maximum air temperature and relative humidity in the afternoon are the two most significant environmental variables influencing yield irrespective of picks.Item Available soil phosphorus in coconut plantations in boralu and pallama soil series, under different fertilizer regimes, in Gampaha district of Sri Lanka(Coconut Research Institute. Lunuwila, 2007) Jayakody, J.A.D.S.S.; Tannakoon, N.A.; Fernandopulle, M.N.D.Item Available soil phosphorus in coconut platations in boralu and pallama soil series, under different fertilizer regimes in Gampaha district of Sri Lanka(2007) Jayakody, J.A.D.S.S.; Tennakoon, N.A.; Fernandopulle, M.N.D.Item Biomedical and environmental aspects of some coconut-derived products and their production processes in Sri Lanka(Coconut Research Institute. Lunuwila, 1998/1999) Wickramasinghe, R.H.The coconut palm is said to have been introduced to Sri Lanka over 2300 years ago. Several industries have grown up to process products from this tree. Many of these production units have traditionally been located in rural areas and any adverse environmental impacts have in the past been considered negligible or not very serious. However, with the development of these industries and the increasing density of population more concern is being taken to identify and mitigate any adverse environmental effects and biomedical effects on workers in these industries as well as the general public. The industries examined in this article relate to the production of 1) coconut oil 2). desiccated coconut 3.) charcoal and activated carbon and 4) husk fibre and coir pith. Biomedical aspects of some of these products are also noted as well as articles which can serve as guides to the literature in each area.Item Boron deficiency in young coconut (Cocos nucifera L.) in Sri Lanka:symptoms and corrective measures(CRI, 1988) Jayasekara, K.S.; Loganathan, P.Item The brown dwarf. a recent addition to the varieties and forms of the coconut palm grown in Sri Lanka(Coconut Research Institute. Lunuwila, 1996) Peries, R.R.A.Item The brown dwarf. a recent addition to the varieties and forms of the coconut palm grown in Sri Lanka(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Perera, L.; Peries, R.R.A.; Padmasiri, M.H.L.Item Callus induction and direct shoot formation in in vitro cultured immature inflorescence tissues of coconut(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Vidhanaarachchi, V.R.M.; Weerakoon, L.K.Abstract link with word file.Item A case study on physiology -based drought screening of coconut with selected accessions(Coconut Research Institute. Lunuwila, 2007) Nainanayake, A.D.; Morison, J.I.L.Item A case study on physiology-based drought screening of coconut with selected accessions(2007) Nainanayake, A.D.; Morison, J.I.L.Item Classificatin of farmers adopting coconut -based intercropping systems in small -holdings using cluster analysis(CRI. Lunuwila, 2000-2002) Fernando, M.T.N.; Daw, M.E.; Edwards, I.E.; Glendinning, A.Item Clonal propagation of coconut:improved culture conditions for rhyzogenesis(Coconut Research Institute of Sri Lanka. Lunuwila, 1994-95) Fernando, S.C.; Gamage, C.K.Emphasis has recently been placed on improving culture conditions at the rooting stage of the coconut (cocos nucifera L) cloning procedure. In these experiments shoots for rooting were obtained by culturing shoot apices.