Changes in ATP content, enzyme activity and inorganic nitrogen species during composting of organic wastes

Abstract

all enzyme activities were higher in sewage sludge than in city refuse, at all times, denoting larger microbial populations; this was also confirmed by a high initial ATP level. In addition to differences in microbial biomass, the lower enzyme activity in city refuse might also depend on inhibition by a high content of heavy metals. Absolute urease and phosphatase activities decreased during composting, showing a minimum at 9l and 65 d, respectively; thereafter they increased slightly. ATP also decreased markedly during the first month, then it stabilized to a low level. The correlation found between ureasephosphatase-ATP and the lack ofcorrelation between proteases, and between both proteases and ATP-

Enzyme activity and C and N pools in soil following application of mulches

“…In addition, it is well known that urease is inhibited by high concentrations of NH 4 + (as reported in Table 7), so that the decrease at T 2 of ammonia concentrations results in an increase of urease activity (Diaz-Burgos et al 1993;Garcia et al 1992). The increases in urease activity for no-till were demonstrated by others (Klein and Koths 1980;Doran 1980;Dick 1984;Angers et al 1993) who reported higher enzyme activities in conservation compared to conventional soil tillage.…”

“…minal phase of high molecular weight substrate degradation (Skujins et al 1976;Nannipieri et al 1990) and manifests a shifted activity over time, being the last enzyme involved in the N pathway (Garcia et al 1992). In addition, it is well known that urease is inhibited by high concentrations of NH 4 + (as reported in Table 7), so that the decrease at T 2 of ammonia concentrations results in an increase of urease activity (Diaz-Burgos et al 1993;Garcia et al 1992).…”

Assessment of Microbial Communities and Their Relationship with Enzymatic Activity during Composting

“…β-glucosidase did not show any significant (at p = 0.05) correlation with microbial colonies. As suggested by [21] the significant component of the β-glucosidase activity is due to the stabilized extracellular enzyme fraction and is not directly associated with the extant microbial biomass. Strong positive correlation was observed between phosphodiesterase activity and mesophilic bacteria.…”

Relationship between Microbial C, Microbial N and Microbial DNA Extracts during Municipal Solid Waste Composting Process

“…The most common parameters include compost temperature, pH, cation exchange capacity, dissolved organic C, C/N ratio, humification index, plant growth bioassay, spectroscopic methods, etc. (Garcia et al, 1992;Castaldi et al, 2004).…”