Browsing by Author "Somasiri, L.L.W."
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Item An anion exchange resin method for soil phosphorus estimation(Soil Science Society of Sri Lanka:Colombo, 1996) Wijebandara, D.M.D.I.; Somasiri, L.L.W.Item Application of three phosphate fertilizers on short term availability and changes of different phosphorus fractions in Andigama soil series(Soil Science Society of Sri Lanka:Peradeniya, 2008) Duminda, D.M.S.; Somasiri, L.L.W.; Pathiratne, K.A.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 Effect of the methods of applying Potassium and Magnesium fertilizers on their interaction in the soil and uptake by coconut (Cocos nucifera L.)(CRI. Lunuwila, 2000-2002) Giritharan, D.; Somasiri, L.L.W.; Perera, B.S.V.J.Item Evaluation of cation exchange resin method for determination of exchangeable bases, Manganese and Zinc in soils of the low country of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1996) Perera, K.T.M.S.; Somasiri, L.L.W.Item The interaction between potassium and magnesium red yellow podzolic soils with laterite and its effect on nutrition of coconut palms(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Somasiri, L.L.W.The interaction between plant available potassium and magnesium in highly leached red yellow podzolic soild with laterite in southern coastal area of Sri Lanka and its effect on coconut palm was studies in a 3*2K*Mg factorial experiment that consisted of 3 levels of potassium and 2 levels of magnesium fertilizer application to coconut palms in plots. Five years after continuation of treatment application, soil samples were taken from top soils (0-20 cm) and sub soils (20-40cm) at monthly intervals for 10 months and analyzed for exchangeable potassium and magnesium (1M ammonium acetate extraction at pH 7.0) and water soluble potassium and magnesium (1:10soil/water ratio). Leaf samples taken from the 14 frond at bimonthly intervals were analyzed for potassium and magnesiu.. The results showed that the application of potassium fertilizer decreased the quantity of both exchangeable and water extractable magnesium and magnesium fertilizer decreased the quantity of exchangeable potassium in soils. The mutual decreasing effect on the exchangeable fraction of each nutrient is attributed to low cation exchange capacity and base saturation of the soils. The close association of the coconut leaf nutrient contents with soil nutrient status implies that poor chemical characteristics of red yellow podzolic soils bring about imbalance of potassium and magnesium nutrition in coconut palms.Item Loss of nutrients in a high yielding coconut plantation through removal of plant materials from the field(CRI. Lunuwila, 2003) Somasiri, L.L.W.; Wijebandara, D.M.D.I.; Panditharatna, B.D.P.; Sabaratnam, S.; Kurundukumbura, C.P.A.Item Organic manures. a potential micronutrient source for coconut(Coconut Research Institute. Lunuwila, 1996/1997) Tennakoon, N.A.; Somasiri, L.L.W.Item The proper soil moisture-air status for coconut(Coconut Research Institute. Lunuwila, 1993) Somasiri, L.L.W.Item Studies on seasonal fluctuation of exchangeable cations in a loamy sand of a coconut plantation(Eastern University. Chenkalady, 2000) Giritharan, D.; Somasiri, L.L.W.; Perera, B.S.V.J.Item Use of a cation exchange resin for determination of plant available micro nutrients in upland soils of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Perera, K.T.M.S.; Somasiri, L.L.W.; Jayakody, A.N.Item Utilization of coconut water from DC manufacture to develop a beverage and a health drinkSomasiri, L.L.W.; Marikkara, J.M.N.; Hewavitharanage, P.