alkaline phosphatase activity showed a similar trend to that of ASA in both soils : an increase in the 30 days of incubation followed by pronounced decrease in activities.
the APA and ASA plays an eionssential role in the mineralisation of organic P and organic S in soil, respectively.
the APA and ASA of low C:N ratio and high doses of sludge treatments were higher than those of other treatments.
thus indicated that there were higher amounts of readily available substrates in the substrates in the sewage sludge initially.
organic matter in sludge usually contain high amounts of APA ans ASA substrates