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Microbiological parameters as indicators of compost maturity.
J Appl Microbiol. 2005; 99(4):816-28.JA

Abstract

AIMS

The objectives of this study were to determine the changes of microbial properties of pig manure collected from pens with different management strategies and composted using different turning and moisture regimes; relate their association with humification parameters and compost temperature; and identify the most suitable microbial indicators of compost maturity.

METHODS AND RESULTS

Six different microbial parameters, including total bacterial count, oxygen consumption rate, ATP content, dehydrogenase activity, and microbial biomass C and N, along with humification parameters [humic acid (HA), fulvic acid (FA) and HA : FA ratio] and compost temperature were monitored during composting. Significant positive correlations were found between temperature and microbial properties, including O2 consumption rate, ATP content, dehydrogenase activity, and microbial biomass N. The humification parameters also showed significant correlations with microbial properties of the manure compost. For instance, HA contents of pig manures was positively correlated with total aerobic heterotrophs, and microbial biomass N and C; and negatively correlated with O2 consumption rate, ATP content, and dehydrogenase activity. Among the six microbial parameters examined, dehydrogenase activity was the most important factor affecting compost temperature and humification parameters. Composting strategies employed in this study affected the speed of composting and time of maturation. If the moisture content is maintained weekly at 60% with a 4-day turning frequency, the pig manure will reach maturity in 56 days.

CONCLUSIONS

The composting process went through predictable changes in temperature, microbial properties and chemical components despite differences in the initial pig manure and composting strategies used. Among the six microbial parameters used, dehydrogenase activity is the most suitable indicator of compost maturity. Compared with respiration rate, ATP content and microbial biomass procedures, dehydrogenase activity is the simplest, quickest, and cheapest method that can be used to monitor the stability and maturity of composts.

SIGNIFICANCE AND IMPACT OF THE STUDY

The results presented here show that microbial parameters can be used in revealing differences between composts and compost maturity. The statistical relationship established between humification parameters and microbial parameters, particularly dehydrogenase activity, demonstrates that it is possible to monitor the composting process more easily and rapidly by avoiding longer and more expensive analytical procedures.

Authors+Show Affiliations

Department of Natural Sciences, The University of Michigan, Dearborn, MI 48128, USA. smtiquia@umd.umich.edu

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16162232

Citation

Tiquia, S M.. "Microbiological Parameters as Indicators of Compost Maturity." Journal of Applied Microbiology, vol. 99, no. 4, 2005, pp. 816-28.
Tiquia SM. Microbiological parameters as indicators of compost maturity. J Appl Microbiol. 2005;99(4):816-28.
Tiquia, S. M. (2005). Microbiological parameters as indicators of compost maturity. Journal of Applied Microbiology, 99(4), 816-28.
Tiquia SM. Microbiological Parameters as Indicators of Compost Maturity. J Appl Microbiol. 2005;99(4):816-28. PubMed PMID: 16162232.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Microbiological parameters as indicators of compost maturity. A1 - Tiquia,S M, PY - 2005/9/16/pubmed PY - 2006/2/17/medline PY - 2005/9/16/entrez SP - 816 EP - 28 JF - Journal of applied microbiology JO - J Appl Microbiol VL - 99 IS - 4 N2 - AIMS: The objectives of this study were to determine the changes of microbial properties of pig manure collected from pens with different management strategies and composted using different turning and moisture regimes; relate their association with humification parameters and compost temperature; and identify the most suitable microbial indicators of compost maturity. METHODS AND RESULTS: Six different microbial parameters, including total bacterial count, oxygen consumption rate, ATP content, dehydrogenase activity, and microbial biomass C and N, along with humification parameters [humic acid (HA), fulvic acid (FA) and HA : FA ratio] and compost temperature were monitored during composting. Significant positive correlations were found between temperature and microbial properties, including O2 consumption rate, ATP content, dehydrogenase activity, and microbial biomass N. The humification parameters also showed significant correlations with microbial properties of the manure compost. For instance, HA contents of pig manures was positively correlated with total aerobic heterotrophs, and microbial biomass N and C; and negatively correlated with O2 consumption rate, ATP content, and dehydrogenase activity. Among the six microbial parameters examined, dehydrogenase activity was the most important factor affecting compost temperature and humification parameters. Composting strategies employed in this study affected the speed of composting and time of maturation. If the moisture content is maintained weekly at 60% with a 4-day turning frequency, the pig manure will reach maturity in 56 days. CONCLUSIONS: The composting process went through predictable changes in temperature, microbial properties and chemical components despite differences in the initial pig manure and composting strategies used. Among the six microbial parameters used, dehydrogenase activity is the most suitable indicator of compost maturity. Compared with respiration rate, ATP content and microbial biomass procedures, dehydrogenase activity is the simplest, quickest, and cheapest method that can be used to monitor the stability and maturity of composts. SIGNIFICANCE AND IMPACT OF THE STUDY: The results presented here show that microbial parameters can be used in revealing differences between composts and compost maturity. The statistical relationship established between humification parameters and microbial parameters, particularly dehydrogenase activity, demonstrates that it is possible to monitor the composting process more easily and rapidly by avoiding longer and more expensive analytical procedures. SN - 1364-5072 UR - https://www.unboundmedicine.com/medline/citation/16162232/Microbiological_parameters_as_indicators_of_compost_maturity_ L2 - https://doi.org/10.1111/j.1365-2672.2005.02673.x DB - PRIME DP - Unbound Medicine ER -