Trends in Applied Sciences Research1819-35792151-7908Science International10.3923/tasr.2007.549.553OkoroigweE.C. 6200726Enhancing soil nutrient level using biomass technology was carried out by use of bio-fertilizer (a by-product of anaerobic digestion of wastes). The effect of the use of bio-fertilizer obtained by anaerobic digestion of piggery wastes for different retention time of one, two, three and four week period was investigated against non digested natural and non application of bio-fertilizer. Nsukka yellow pepper (Capsicum annuum L.) was used as test plants. Both the plants and bio-fertilizer (manure) were placed randomly in bags. The results showed that the application of bio-fertilizers increased the pepper yield in terms of plant height, number of fruits, branches and mass of fruit against plants planted without the bio-fertilizer. Among bio-fertilizer treatments, the 21-day (3 weeks) retention (RT) bio-fertilizer application yielded more than the rest in terms of the parameters above followed by the undigested raw waste.]]>Eboatu, A.N., I.J. Dioha, M.U. Akpuaka, D. Abdullahi and R.U. Arinze,20062006Sirafy, Z.M.E., H.J. Woodard and E.M.E. Norjar,200629587599Eze, J.I., B. Garba and A.T. Atiku,19981998Nelson, C. and J. Lamb,20022002Oparaku, N.F.,2006164145Roberts, D.,20052005Silva, P.S.L., J. da Silva, F.H.T. de Oliveira, A.K.F. de Sousa and G.P. Duda,200624166169Taignides, E.P., E.R. Bauman, H.P. Johnson and T.E. Hazen,19638327333Ukomadu, U.U.,1984Capsicum annuum L.),]]>1984