Transformations of carbon and nitrogen during composting of animal manure and shredded paper |
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Authors: | T Paré H Dinel M Schnitzer S Dumontet |
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Institution: | (1) Research Branch, Agriculture and Agri-Food Canada, Ottawa, K1A 0C6, Canada Fax: (613) 759-1926; e-mail: PARET@EM.AGR.CA, CA;(2) Dipartimento di Produzione Vegetale, Universitá delle Basilicata, I-85100 Potenza, Italy, IT |
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Abstract: | Composts produced from animal manures and shredded paper were characterized in terms of their carbon (C) and nitrogen (N)
forms and C mineralization. Total, water-soluble, acid-hydrolyzable and non-hydrolyzable C and N contents were determined
on composts sampled on days 0, 11, 18, 26, 33, 40 and 59 after composting was initiated. Water-soluble and acid-hydrolyzable
C and N decreased during composting, whereas non-hydrolyzable C remained relatively constant, and non-hydrolyzable N greatly
increased during composting. The water-soluble forms of N were characterized by a decrease of ammomium (NH4
+-N) at the beginning of composting, followed by an increase of nitrate (NO3
–-N) towards the end of composting. The mineralization of C in composted materials was generally higher at the beginning than
at the end of composting, whereas no differences were observed for mineralization of C in non-hydrolyzable materials. The
addition of N inhibited C mineralization in composts except in samples collected on days 40 and 59, while C mineralization
was strongly stimulated by adding N to the non-hydrolyzable materials. The data suggest that the N forms in the non-hydrolyzable
materials were chemically similar and not readily available to microbes, indicating that the C/N ratios often used to assess
the biodegradability of organic matter and to develop compost formulations should be based on biologically available N and
C and not on total N and C.
Received: 12 May 1997 |
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Keywords: | Composts Animal manure Non-hydrolyzable carbon Non-hydrolyzable nitrogen C/N ratios |
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