Tropical agricultural research & extension, Vol. 15, no.1-4 (2012) : Vol. 16, no. 1-4 (2013) : Vol.17, no. 1-4 (2014) - Ruhuna: Faculty of Agriculture, University of Ruhuna, 2014. ISSN: 13913646 Dewey Class. No.: 630.05 / TRO