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A commercial approach to non-plantation perennial crop development: perennial crop development project
No full textVegetative compatibility of Ganoderma isolates from differenthost plants and geographical regions
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Fatty acid composition of three improved cultivars and ordinarytall coconut palms of Sri Lanka
No full textInsect antifeedant and growth regulatory effects of azadirachtinfrom neem )Azadirachra indica A. Juss)
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Biomedical and environmental aspects of some coconut-derived products and their production processes in Sri Lanka
Get PDFThe coconut palm is said to have been introduced to Sri Lanka over 2300 years ago. Several industries have grown up to process products from this tree. Many of these production units have traditionally been located in rural areas and any adverse environmental impacts have in the past been considered negligible or not very serious. However, with the development of these industries and the increasing density of population more concern is being taken to identify and mitigate any adverse environmental effects and biomedical effects on workers in these industries as well as the general public. The industries examined in this article relate to the production of 1) coconut oil 2). desiccated coconut 3.) charcoal and activated carbon and 4) husk fibre and coir pith. Biomedical aspects of some of these products are also noted as well as articles which can serve as guides to the literature in each area
Soil water extraction pattern of coconut (Cococs nucifera L.) in relation to soil compaction
Get PDFEffect of soil compaction on the gowth and activity of coconut roots in two soil series, namely, Andigama series (gravelly soil) and Madampe series (sandy loam soil) was studied. The effective root zone of coconut in relation to water sbsorption process under natural soil compaction were also investigated. Soil compactin and soil moisture absorption ability was determined using cone penetrometer and neutron scattering methods, respectively. Coconut root distributution in Andigama and Madampe series showed that 75%-80% of roots of adult coconut palms were localised in a depth ranging from 20 cm to 100 cm. About 5% of the roots were located beyond the 100 cm depth and 15% -20% was confined to the top layer (0-20 cm) of soil. Root growth of coconut in the two series did not show any significant differences. However, the root activity in the Madampe series, with respect to moisture absorption was higher that that of the Andigama series due to low compaction of the former. Results also showed that soil compaction higher than 250N/cm restricted the activity of coconut roots in the Andigama series for moisture absorption up to a distance of 2m away horizontally from the base of the tree and the highest moisture extraction was observed at m distance. High moisture extraction by coconut roots was confined to a depth ranging of 20 to 120 cm and of 20 to 250 cm in soils of Andigama and Madampe series, respectively, due to differences in soil compaction levels. It was condluded that soil compaction limits the water absorption ability of coconut roots vertically from the base of the tree, rather than coconut root growth and penetration