COCOS - Journal of the Coconut Research Institute of Sri Lanka
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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 Is there ecological adaptation in coconut nursery seedlings stage?:a preliminary investigation(Coconut Research Institute of Sri Lanka. Lunuwila, 1994-95) Peries, R.R.A.; Everard, J.M.D.T.Seedlings were raised in three nurseries representing different agro-ecological regions, to test whether growing seddlings exhibited adaptation to a particular environment. Seed nuts were also selected from agro-ecologically different regions. The T x T seed nuts from the isolated coconut seed garden showed a faster rate of germination at all sites compared to Moorock seed nuts (from the North western region) or Dehigahalande seed nuts (from the Southern region). The vigor of seedlings (a qualitative assessment based on the number of vigorous seedlings selected) was enhanced by a good soil water supply during the early nursery stages combined with a higher level of solar-radiation at the nursery site. There was no interaction between the source of seed nut and site of nursery indicating the absence of manifestation of ecological adaptation at the seedlings nursery. The quality of the seedlings was enhanced by adequate soil water and high level of solar radiation on the nursery beds. The subsequent peerformance of these seedlings would have followed up after field planting to confirm the assumptions on adaptation discussed.Item A comparison of two coconut cultivars for high productivity under irrigation(Coconut Research Institute of Sri Lanka. Lunuwila, 1994-95) Peries, R.R.A.Over four decades of research indicate that the cultivar CRIC65 is capable of producing a sustained higher yield compared to CRIC60 inthe absence of adverse soil water deficit. Data indicate that the cumulative yield of nuts and copra are 50 per cent higher in CRIC65 than in CRIC60 over a period of 32 years. Inadequate soil water would appear to be the main limiting factor to the yield production in CRIC65. The argument is, therfore made, that if coconut is to be grown under irrigation, the cultivar CRIC65 should be selected due to its high potential productivity.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 The suitability of optional material as a replacement for coir dust in raising coconut seedlings in polybags(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Bandaranayake, C.K.; Peries, R.R.A.; Perera, L.Although coir dust is recommended in the current potting mixture for raising coconut seedlings in polybags, it is becoming a scarce resource even within the coconut triangle. Therefore it was considered imperative to test the suitability of other options available locally. An experiment conducted at the Bandirippuwa research nursery of the Coconut Research Institute revealted that saw dust, paddy husk, decomposed straw and weed trash were similar in action to coir dust in the potting media, condidering the growth parameters of seedlings. However with due respect to practical conciderations, saw dust was found to be the best alternative. If there is no labour shortage, partially decomposed straw and weed trash can be used. Paddy husk was found to be the least important.Item Effects of biomonthly rainfall on coconut yield in the low country intermediate zone (IL) of Sri Lanka(CRI, 1991-93) Peiris, T.S.G.; 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. Lunuwila, 1996) Peries, R.R.A.Item Improvement of seedling quality in polybags through manipulation of potting media(Coconut Research Institute. Lunuwila, 1996) Perera, L.; Peries, R.R.A.; Jayatileke, R.