Modelling N mineralization from bovine manure and sewage sludge composts

Nitrogen mineralization kinetics were compared in three different soils (pH values: 5.2, 7.1 and 8.6) when treated with bovine manure (BM) and sewage sludge (SS) composts. The soil–compost mixtures were kept at a controlled moisture content of 60% of their water holding capacity (WHC) and were incub...

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Veröffentlicht in:Bioresource technology 2011, Vol.102 (2), p.863-871
Hauptverfasser: Gil, M.V., Carballo, M.T., Calvo, L.F.
Format: Artikel
Sprache:eng
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Zusammenfassung:Nitrogen mineralization kinetics were compared in three different soils (pH values: 5.2, 7.1 and 8.6) when treated with bovine manure (BM) and sewage sludge (SS) composts. The soil–compost mixtures were kept at a controlled moisture content of 60% of their water holding capacity (WHC) and were incubated in the dark at 25 °C for 2 years. Five mathematical models were compared (simple exponential, double exponential, special model, hyperbolic and parabolic), using as experimental data the mineralized N accumulated during 360 and 720 days of incubation. The results showed that the best fit for describing the mineralization of organic N from the compost after 1 year of experimentation was obtained with the simple exponential model. However, the special model showed the best fit for data from 2 years of incubation and thus better reflected organic N mineralization over a longer time-span. This suggested that the organic N in the two composts was made up of two organic pools of different degrees of stability.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2010.09.010