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Published online 27 October 2006
Published in J Environ Qual 35:2313-2320 (2006)
DOI: 10.2134/jeq2006.0055
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Extracted Organic Carbon and Microbial Biomass as Stability Parameters in Ligno-Cellulosic Waste Composts

Claudio Mondinia,*, Miguel A. Sánchez-Monederob, Tania Siniccoa and Liviana Leitaa

a CRA-Instituto Sperimentale per la Nutrizione delle Piante, sezione di Gorizia, Via Trieste 23, I-34170 Gorizia, Italy
b CEBAS-CSIC, Departamento de Conservación de Suelos y Agua y Manejo de Residuos Orgánicos, Campus Universitario de Espinardo, E-30100 Espinardo, Murcia, Spain


Figure 1
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  		Fig. 1. Temperature and total organic C/total N (CORG/NTOT) ratio evolution in compost CW, Y, and M during the composting process. Bars represent standard deviation (n = 3).

 

Figure 2
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  		Fig. 2. Dynamics of water-extracted organic carbon (WEOC), humic-like substances carbon (HLC), nonhumic carbon (NHC), and WEOC/total N (WEOC/NTOT) ratio in compost CW, Y, and M. Bars represent standard deviation (n = 3).

 

Figure 3
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  		Fig. 3. Time course of alkali-extracted organic C (TEC), humic-like substances C (HLC), nonhumic C (NHC), humification index (HI), and degree of humification (DH) in compost CW, Y, and M. Bars represent standard deviation (n = 3).

 

Figure 4
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  		Fig. 4. Dynamics of humic-like substances C (HLC) in compost CW, Y, and M (data expressed as absolute amount). Bars represent standard deviation (n = 3).

 

Figure 5
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  		Fig. 5. Time course of microbial biomass C (BC) and microbial biomass ninhydrin-reactive N/total N ratio (BNIN/NTOT) in compost CW, Y, and M. Bars represent standard deviation (n = 3). For each compost, letters indicate statistical significance at P < 0.05 using Student-Newman-Keuls multiple range test.

 




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