COCOS - Journal of the Coconut Research Institute of Sri Lanka

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Subject: search.filters.subject.Coconut palms

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    The sulphur nutrition of coconut
    (CRI. Lunuwila, 1985) De Silva, M.A.T.; Anthonypillai, G.M.; Mathes, D.T.
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    Role of Gliricidia sepium on physical improvement of gravelly soil
    (Coconut Research Institute. Lunuwila, 1996) Vidana Arachchi, L.P.; Liyanage, M. De S.
    The Andigama soil series, which is widespread in coconut lands, is known to have poor physical characters restricting palm growth and yield in the intermediate zone of Sri Lanka. This study was carried out to investigate the possibility of improving degraded soil conditions of Andigama series by intercropping with Gliricidia sepium under coconut. Gliricida sepium was established in a 45 year old coconut plantation in double rows of 2m x 1m and arranged in a Randomized Block design with four replicates. The effect on soil physical characters such as texture, bulk density, aeration capacity, moisture retention and root distribution pattern of Gliricidia sepium were studied. Results revealed that clay faction cemented with gravel significantly increased (P0.05)bulk density (1.62 +-0.07). it acts as a physical barrier and reduced readily available water fraction in B horizon. the available water fraction in A, AB and B horizons decreased by 66
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    Some studies on the use of Metarhizium anisopliae (Metsch.) Sor. for the control of Oryctes rhinoceros in Sri Lanka
    (Coconut Research Institute of Sri Lanka. Lunuwila, 1994-95) Fernando, L.C.P.; Kanagaratnam, P.; Narangoda, N.K.
    Black beetle, oryctes rhinocers L. larvae and adults were inoculated in the laboratory with three isolates of the fungus Metarhizium anisopliae (Metsch.) Sor, to screen their virulence against black beetle. ALl the isolates caused 100 per cent mortality of larvae and adults when treated with suspensions of 10(7) conidia/ml. Comparatively the local isolate caused a slow death rate in larvae and adults than the other isolates. Fifty grams of the maize inoculum per 0.008 m2 of breeding medium were sufficient to cause 100 per cent death rate of larvae. In the field, the fungus was capable of disseminating at least 10 m and the impregenation boxes (infection foci) were attractive to black beetle. It is suggested that M.anisopilae could be used as an effective bio-control agent in the intergrated management of black beetle.