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Farmer perception and demand for pesticide in rice cultivation of sri lanka

By Munaweera, T.P.. Colombo Hector kobbekaduwa agrarian research and training institute 2017 . ix,44p. 24cm.. 9789556122343

By Jayasinghe, Uthpala. Colombo Hector Kobbekaduwa Agrarian Research and Training Institute 2016 . xiii,80p 24cm. 9789556122053

Washington World Bank 1980 . ii,81 p. 23 cm..

By Bamunuarachchi, B.A.D.S.. Colombo Hector Kobbekaduwa Agrarian Research and Training Institute 2013 . ix,54p. 29 cm. 9789556121605