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 Ground water in the coconut triangle(Coconut Research Institute. Lunuwila, 1983) Fernando, A.D.N.Item Studies on root and tuber crops grown in association with coconut 1. . survey on root and tuber crops found under coconut and the morphological characterization of edible aroids(Coconut Research Institute. Lunuwila, 1983) Ibrahim, M.N.M.; Raveendranath, S.; Balasubramaniam, S.Item Studies on the biology of Antrocephalus hakonensis (Hymenoptera : Chalcididae). a pupal parasitoid of Opisina arenosella the coconut caterpillar(Coconut Research Institute. Lunuwila, 1983) Abdurahiman, U.C.; Mohamed, U.V.K.; Remadevi, O.K.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 Effect of four commercial preparations of Bacillus thuringiensis on Opisina arenosella Walker(Coconut Research Institute. Lunuwila, 1983) Kanagaratnam, P.; Pethiyagoda, U.; Velu, M.S.Item A new technique for establishing coconut seed gardens(Coconut Research Institute. Lunuwila, 1983) Liyanage, D.V.; Azis, H.Item A technique for the application of systemic insecticides through petiolar wells in coconut(CRI, 1989) Perera, P.A.C.R.; Mahindapala, R.; Pethiyagoda, U.Item A method for determining leaf area of one, two and three year old coconut seedlings (Var. CRIC 60)(CRI, 1989) Mathes, D.T.; Liyanage, L.V.K.; Randeni, G.Item Nematodes associated with cocont (Cocos nucifera L.) in Sri Lanka(Coconut Research Insitute. Lunuwila, 1987) Ekanayake, H.M.R.K.; Lamberti, F.Item Competitive effects of weeds and beneficial effects of mulching on coconut seedlings(Coconut Research Insitute. Lunuwila, 1987) Remison, S.U.; Mgbeze, G.