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Waste Management & Research
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Microbial Biomass in a Soil Amended with Different Types of Organic Wastes

Naceur Jedidi

Institut National de Recherche Scientifique et Technique, BP 95, 2050 Hammam Lif, Tunisia Jedidi{at}inrst.rnrt.tn

Abdennaceur Hassen

Institut National de Recherche Scientifique et Technique, BP 95, 2050 Hammam Lif, Tunisia

Oswald van Cleemput

Faculté des Sciences Agronomiques et Biologiques Appliquées, Université de Gand, 653 Coupure Links, B-9000 Gent, Belgium

Ali M’Hiri

Institut National Agronomique de Tunisie, Cité Mahrajène, 1082 Tunis, Tunisia

Application of different types of organic wastes may have a marked effect on soil microbial biomass and its activity. The objective of this study was to quantify the amount of microbial biomass in a loamy-clayey soil, amended with different types of organic waste residues (composts of municipal solid waste of different ages, sewage sludge and farmyard manure) and incubated for 8 weeks at 25°C and two-thirds of field capacity, using the fumigation–extraction method. Both microbial biomass-C and -N (B C and B N, respectively) appeared to be dependent on the type of organic waste residues, on their degree of stability, and on their chemical characteristics. In general, organic wastes increased the microbial biomass-C content in the soil and the microbial B C was positively correlated with the organic C content, the C/N, neutral detergent fibre/N (NDF/N) and acid detergent fibre/N (ADF/N) ratios. The microbial biomass content decreased according to the period of incubation, especially when the compost used was immature. The microbial biomass-N was positively correlated with the total N and percentage of hemicellulose. The microbial biomass-C was linearly related with the microbial biomass-N and the ratio B C/B N was exponentially related with the B C.

Key Words: Soil • organic wastes • microbial biomass • fumigation-extraction • wmr 613–6

Waste Management & Research, Vol. 22, No. 2, 93-99 (2004)
DOI: 10.1177/0734242X04043930
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