Browsing by Author "Yapa, U.W.S.P."
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Item Drinking water quality of some wells in the intensive vegetable growing lands in the upcountry wet zone(Soil Science Society of Sri Lanka:Colombo, 2001) Wijewardena, J.D.H.; Yapa, U.W.S.P.; Yatagama, S.M.K.G.Item Efficiency of partially acidulated Eppawala phosphate rock as a phosphorus source for potato and vegetables(Soil Science Society of Sri Lanka:Colombo, 1998) Wijewardana, J.D.H.; Yapa, U.W.S.P.