Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2002.952.955SajjadM. H.LodhiA. AzamF. 9200259An incubation experiment was conducted under laboratory conditions to study the changes in some soil enzymes during the decomposition of plant residues. Soil samples amended with powdered plant material of wheat, maize and sesbania were incubated for 8 weeks at moisture content of 60% of the maximum water holding capacity and 22-26°C for 8 weeks. At 0, 2, 4 and 8 weeks of incubation, portions of soil were analyzed for total C and activity of different enzymes. Maximum dehydrogenase and invertase activity was observed for sesbania and minimum in unamended soil, however there was no consistent trends with incubation intervals. Cellulase activity was not affected strongly by organic amendments, however it increased with time in amended than unamended soils. The differences between different treatments were non significant for urease.]]>Anonymous,1954pp: 160pp: 160Azam, F. and K.A. Malik,1985Leptochloa fusca and Sesbania aculeata in soil under different conditions.]]>1313Azam, F., F.W. Simmons and R.L. Mulvancy,19932517871792Azam, F., K. Haider and K.A. Malik,1985861525Bolton, H., L.F. Elliott, R.I. Ppendick and D.F. Bezdicek,198517297302Bremner, J.M. and C.S. Mulvaney,19821982pp: 599-622pp: 599-622Brookes, P.C.,199519269279Deng, S.P. and M.A. Tabatabai,19942613471354Fox, R.H., R.J.K. Myers and I. Vallis,1990129251259Friedel, J.K., K. Molter and W.R. Fischer,199418291296Gascoigne, J.A. and J.P. Gascoigne,1958pp: 165pp: 165Haider, K. and F. Azam,1982146151159Keeney, D.R. and D.W. Nelson,19821982pp: 594-624pp: 594-624Ladd, J.N.,19851985pp: 175-221pp: 175-221Lodhi, A., N.N. Malik, T. Mahmood and F. Azam,20003868871Masciandaro, G., B. Ceccanti, V. Ronchi and C. Bauer,200032479483Moreno, J.L., T. Hernandez and C. Garcia,199928230237Nannipieri, P., P. Sequi and P. Fusi,19961996pp: 293-328pp: 293-328Nannipieri, P., R.L. Johnson and E.A. Paul,197810223229Pancholy, S.K. and E.L. Rice,1973374750Parmelee, R.W., M.H. Beare and J.M. Blair,19892197103Ross, D.J.,196617115Shields, J.A., E.A. Paul, W.E. Lowe and D. Parkinson,197363137Skujins, J.,19764383421Svensson, K. and M. Pell,2001339199Page, A.L., R.H. Miller and D.R. Keeney,19822nd Edn.,Visser, S. and D. Parkinson,199273337Waksman, S.A.,192214321346Zhengping, W., O. van Cleemput, L. Liantie and L. Baert,199111101104