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Simulating Urban Waste Compost Effects on Carbon and Nitrogen Dynamics Using a Biochemical Index

Environment and Arable Crops Research Unit, Institut National de la Recherche Agronomique, 78850 Thiverval-Grignon, France

View larger version (15K): [in a new window]   Fig. 1. Schematic of C and N flows in the NCSOIL model. The term OM is organic matter.

View larger version (30K): [in a new window]   Fig. 2. NCSOIL-simulated (lines) and observed (symbols, ±1 SD) data for C and N mineralization kinetics during the 1998 and 2000 incubations for the farmyard manure (FYM) and municipal solid waste compost (MSW). Two NCSOIL parameterizations scenarios are depicted: the optimum (OPT, solid lines) and biological stability index (BSI, dotted lines) based.

View larger version (27K): [in a new window]   Fig. 3. NCSOIL-simulated (lines) and observed (symbols, ±1 SD) data for C and N mineralization kinetics during the 1998 and 2000 incubations for the green waste and sewage sludge compost (GWS) and biowaste (BIO) composts. Two NCSOIL parameterizations scenarios are depicted: the optimum (OPT, solid lines) and biological stability index (BSI, dotted lines) based.

View larger version (24K): [in a new window]   Fig. 4. NCSOIL-simulated (lines) and observed (symbols, ±1 SD) data for C and N mineralization kinetics during the 1998 and 2000 incubations for the control soil samples.

View larger version (12K): [in a new window]   Fig. 5. Relationship between the biological stability index (BSI) and two parameters of the labile fraction estimated in the BSI parameterization scenario: the C to N ratio (open symbols) and the decay rate (closed symbols). The decay rate of the 2000 green waste and sewage sludge compost (GWS) is singled out as an outlier in the regression analysis. The regression equations read as follows: C to N ratio = –74.26BSI + 58.17 (r = 0.80, N = 8, p < 0.05); decay rate (d–1) = –0.0371BSI + 0.029 (r = 0.78, N = 7, p < 0.05).