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Stability Indices For Different Composts

2001; Taylor & Francis; Volume: 9; Issue: 1 Linguagem: Inglês

10.1080/1065657x.2001.10702013

2326-2397

Trine Eggen, Øistein Vethe,

Phosphorus and nutrient management

Four types of compost (paper mill sludge compost, fish compost, biowaste compost from windrow composting treatment and biowaste compost from reactor treatment) were used to evaluate several chemical parameters, which served as stability indices replacing respiration rate. Compost matter, water extracts and NaOH extracts were analyzed. When all composts were statistically treated together, water soluble TOC was the only parameter that correlated significantly with respiration rate (r2=0.82, P<0.0001). This is suggested as an operational parameter at composting plants. Data in this study supported neither the [C:N] ratio nor the humification [HA:FA] ratio as stability indices. When treating only biowaste composts statistically together, TOC (in fulvic acid fraction) and water soluble nitrogen (total and organic) were chemical indices that correlated with respiration rate.