Wijesundara, W.M.G.D.; Nandasena, K.A.; Jinadasa, D.M.
(Vavuniya Campus of the University of Jaffna, 2011-11-16)
With the harvest of a crop, substantial amount of nutrients is removed from soil. If the Soil’s nutrient level is not replenished by adding fertilizers and manures, fertility status of soil is gradually decreasing and as ...