COCOS - Journal of the Coconut Research Institute of Sri Lanka
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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 salinity on the performance of coconut seedlings in two contrasting soils(Coconut Research Insitute. Lunuwila, 1990) Remison, S.U.; Iremiren, G.O.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.Item Goat manure as a soil ameliorant and yield 'stimulant' in coconut(Coconut Research Insitute. Lunuwila, 1990) Tennakoon, N.A.Item Studies on potassium magnesium interaction in coconut (Cocos nucifera)(Coconut Research Insitute. Lunuwila, 1990) Jeganathan, M.Item Culture of immature embryos of coconut, Cocos nucifera L.. callus poliferation and somatic embryogenesis(Coconut Research Insitute. Lunuwila, 1990) Karunaratne, S.; Periyapperuma, K.Item Efficacy of naphthalene balls in the control of rhinoceros beetle attacks in coconut(Coconut Research Insitute. Lunuwila, 1990) Sadakathulla, S.; Ramachandran, T.K.Item Evaluation of honey bee visits on coconut genotypes(CRI, 1991-93) Sadakathulla, S.Item River sand as an alternative to top soil for raising coconut seedlings in polybags(CRI, 1991-93) Peries, R.R.A.; Everard, J.M.D.T.Item Effect of N,K, CI on photosynthesis and water relations of open pollinated tall (typica) coconut seedlings(CRI, 1991-93) Jayasekara, C.; Mudallige, R.G.; Ranasinghe, C.S.