Effect of inorganic ad organic sources of fertilizers on the growth of rubber (Hevea brasiliensis) seedlings - Syamala V.K.; George Sherin; Joseph K.; Nair A.N.S.; Nair N.U. (National Conferene on Organic Farming in Horticultural Crops with special reference to Plantation Crops, 15-18 October, 2008, CPCRI, Kasaragod, India., 2008)