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Item Long-term use of potassium fertilizer for vegetable crops in the upcountry intermediate zone(NARESA:Colombo, 1997) Wijewardena, J.D.H.; Amarasiri, S.L.Item Effect of phosphorus sources and levels with particular emphasis on selectively mined Eppawela rock phosphate on vegetable production(National Science Foundation:, 1998) Wijewardena, J.D.H.