COCOS - Journal of the Coconut Research Institute of Sri Lanka

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Author: search.filters.author.Bandaranayake, C.K.

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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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    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.