Journal of the Rubber Research Institute of Sri Lanka

Permanent URI for this collectionhttps://dl.nsf.gov.lk/handle/1/8676

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Author: search.filters.author.Peries, O.S.Subject: search.filters.subject.Agriculture

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Now showing 1 - 7 of 7
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    Effect of leaf litter on direct and indirect mobilization of P from apatite
    (Rubber Research Institute. Agalawatta, 1987) Pathiratne, L.S.S.; Waidyanatha, U.P. De S.; Peries, O.S.
    Leaf litter as direct and indirect means of improving P availability from apatite was tested. Application of leaf litter impo=roved the P uptake by indicator crops but did not influence the availability of P from applied apatite.
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    Effect of vesicular-arbuscular mycorrhizae on seedling of Hevea and Pueraria phaseoloides
    (Rubber research Institute. Agalawatte, 1984) Jayaratne, A.H.R.; Peries, O.S.; Waidyanatha, U.P. De S.
    Hevea seedlings showed a slight growth responce when inculated with Gigaspora margarita out of four species, tested in sterilised soil. There were no significant differences in the uptake of nutrient by mycorrhizal Hevea plants. Non-mycorrhizal Pueraria plants grew very poorly unless they were given liberal quantities of phosphate fertilizer, confirming previous reparts. All mycorrhizal plants took up more nutrients from soil than non-mycorrhizal plants. Effective nodule formation wassignificantly grater in mycorrhizal plants when phosphorus was added.
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    The management of plant diseases with special reference to Hevea
    (Rubber research Institute. Agalawatte, 1984) Peries, O.S.; Liyanage, A. De S.
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    The control of white root disease in Sri Lanka
    (Rubber Research Institute. Agalawatta, 1973) Liyanage, G.W.; Peries, O.S.
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    Observations on the development of the sporophore of Rigidoporus lignosus and the release and germination of basidiospores
    (Rubber Research Institute of Sri Lanka. Agalawaththa, 1982) Liyanage, I.; Peries, O.S.; Liyanage, A. de S.; Wettasinghe, C.
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    Fertilizer use among perennial crops
    (Rubber Research Institute of Sri Lanka. Agalawaththa, 1982) Peries, O.S.; Yogarathnam, N.
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    Some biases in the generators of technologies by Rubber Research Institute
    (Rubber Research Institute. Agalawatta, 1977) Barlow, C.; Peries, O.S.
    This paper considers the distortion in economic use of resources flowing from the generation of partly inappropriate techniques and technologies. This distortion comes to the situation of smallholdings. As an introduction to the paper some pertinent economics concepts are discussed. A review is made of past research in the major rubber producting countries, and highlights the almost exclusive concentration until recently on techniques and technologies suitable for estate conditions. Some specific examples of bias are reviewed in detail and desirable economic adjustment, in application to the circumstance of smallholdings, are suggested. The examples of major concern involve research on tapping systems, and on planting methods including the specific aspects of tree planting densities, intercropping and wedding. There is also the overall problem that the basic levels of input use on rubber research stations are usually inappropriate to realistic experimentation on the problems of smallholders. It is believed that a better adaptation of available techniques and technologies to the situation of rubber smallholdings can produce substantial economic benefits.