COCOS - Journal of the Coconut Research Institute of Sri Lanka

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    Available soil phosphorus in coconut plantations in boralu and pallama soil series, under different fertilizer regimes, in Gampaha district of Sri Lanka
    (Coconut Research Institute. Lunuwila, 2007) Jayakody, J.A.D.S.S.; Tannakoon, N.A.; Fernandopulle, M.N.D.
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    Evaluation of the phosphorus status of some coconut growing soils of Sri Lanka
    (CRI. Lunuwila, 1984) Loganathan, P.; Dayaratne, P.M.N.; Shanmuganathan, R.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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    Soil water extraction pattern of coconut (Cococs nucifera L.) in relation to soil compaction
    (Coconut Research Institute. Lunuwila, 1998/1999) Vidhana Arachchi, L.P.; Yapa, P.A.J.; Mapa, R.B.; Somapala, H.
    Effect 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.