Journal of the Rubber Research Institute of Sri Lanka

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    The efficiency use of phosphatic fertilizer in relation to the phosphorus fixing capacities of the rubber soils
    (Rubber Research Institute. Agalawatta, 1977) Silva, C.G.; Kumarakulasuriya, S.; Wickramasinghe, L.J.
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    Studies on inoculation of cover legumes for improving nitrogen fixation
    (Rubber Research Institute. Agalawatta, 1977) Waidyanatha, U.P. De S.; Pathiratne, L.S.S.; Ariyaratne, W.A.
    Many rhizobial strains were screened for their nodulating ability against Pueraria, Centrosema, Calopogonium and Desmodium spp. using seedlings grown in nutrient agar. Pueraria in pots but not in the field. This is probably due to natural populations of rhizobia in the soil which were able to successfully compete with the introduced strains in nodulating on the legume. There was evidence that indigenous rhizobia themselves formed effective nodule and fixed nitrogen.
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    Nutrition and fertilizer use in Hevea and associated covers in peninsular Malaysia - a review
    (Rubber Research Institute. Agalawatta, 1977) Pushparajah, E.
    The paper reviews some of the latest findings on nutrition of Hevea and effects of fertilizer on latex properties. It also considers work on increased efficiency in use of fertilisers. The latter includes studies on effect of fertilisers on soil properties and availability of fertiliser residues. The use of appropriate covers and their management to increase their efficiency is considered. Additionally, the influence of the covers on the nitrogen nutrition of Hevea is discussed. The information available indicates that the applications of inorganic N fertilisers could be avoided for up to 8-109 years of tapping, with consequent economic benefits.
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    Management of covers under Hevea in Sri Lanka
    (Rubber Research Institute. Agalawatta, 1977) Yogaratnam, N.; Sulaiman, H.; Karunaratne, A.D.M.; Peiris, K.S.A.C.
    Results of two experiments, comparing the effects of leguminous creepers and naturals as ground covers on growth of immature rubber, are discussed. In one experiment the growthof rubber in plots under pure legume covers was better than that under naturals. Applications of extra nitrogen to trees in plots with natural covers improved their growth but the latter was not comparable to that in legume plots. In the pther experiments the increase in growth of rubber with higher levels of fertiliser nitrogen was observed irrespective of the type of cover. Application of phosphate to covers led to better tree girths than where the phosphate was applied on the trees, irrespective of the type of cover grown. These results are discussed in relation to the nitrogen content of rubber eaves, green matter, litter and C/N ratio of the litter of cover.