4.Journals Published in Sri Lanka
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Item Phosphorus availability in low phosphorous acidic soils as affected by liming and phosphorous addition(Faculty of Agriculture, University of Ruhuna:Kamburupitiya, 2017) Walpola, B.C.; Shamudika, H.U.Item Physico-Chemical Properties of Sri Lankan Instant Black Tea Manufactured Using Broken Mixed Fannings (BMF) as Raw Materials Obtained from Different Estates of Three Elevation Categories(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2020-10) Dalpathadu, K.A.P.; Nissanka, S.P.; Jayasinghe, C.V.L.Item Exploring the Yield Response of Paddy (Oryza sativa L.) under Varying Levels of Soil Nitrogen, Phosphorus and Potassium(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2020-10) Kulasinghe, H.P.G.T.N.; Vitharana, U.W.A.; Dharmakeerthi, R.S.; Sirisena, D.N.; Rathnayake, W.M.U.K.Item Identification of phosphorus efficient rice cultivars under low P nutrition through hydroponic based screening(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2019-11) Kekulandara, D.S.; Bandaranayake, P.C.G.; Sirisena, D.N.; Samarasinghe, W.L.G.; Suriyagoda, L.D.B.Item Potential of Eppawala rock phosphate as a phosphorus fertilizer for rice cultivation in acid sulphate soils in Matara district of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2018) Ratnayake, U.A.J.; Weerasinghe, K.D.N.; Vitharana, U.W.A.; Chandika, K.K.J.Item Advantages of using Eppawela rock phosphate for tea(Tea Research Institute of Sri Lanka:Thalawakelle, 2002) Hettiarachchi, L.S.K.Item The influence of types of phosphatic fertilizers on the growth and nutrient uptake of tea nursery plants(Tea Research Institute. Thalawakele, 1977) Aiyadurai, S.; Sivasubramaniam, S.Item Comparison of routine laboratory methods for the estimation of plant available phosphorus in soils of the low country intermidiate zone of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1994) Wijebandara, D.M.D.I.; Somasiri, L.L.W.Item Rock phosphate fertilizers with special reference to Eppawala(Rubber Research Institute. Agalawatte, 1996) Dissanayake, D.M.A.P.; Perera, A.M.A.; Jayalath, A.Item Ferilizer responses in mature Hevea under Sri Lankan conditions(Rubber Research Institute. Agalawatte, 1984) Yogaratnam, N.; Weerasuriya, S.M.The results of three out of a series of eight experiments that have been in progress (most of them) since 1976, are discussed. Yield increases in the existing plantations could be obtained with increased applications of nitrogen fertilizers in the form of urea. The level of application could be increased to double that of the currenly recommended rate. Some yield increases were also obtained with applications of potassium. It has also been shown that application of rock phosphate to mature rubber trees is not always benificial. Similary, applications of magnesium containing fertilizers to mature rubber should not also be made indiscriminately. Although the leaf K concentration showed K deficiency in one experiments, application of potassium has increased the K may have to be clone specific and at least for the clone RRIC 45, the leaf K levels may have to be reviced. In general, fertilizer application to mature rubber with complete NPKMg mixtures, may not be economically justified, particular ly in the present context of fertilizers and rubber price. The results reported have covered only parts of the planting cycles following fertilizers application. The experiments are still in progress and will be continued at least until the responses have stabilized. A detailed economic analysis at the end of this period would then give a more realistic picture on the economics of fertilizer application for mature rubber under Sri Lankan agro-climatic conditions