Long-term effects of farmyard manure and sewage sludge on some soil biochemical characteristics |
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Authors: | A Saviozzi A Biasci R Riffaldi R Levi-Minzi |
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Institution: | (1) Dipartimento di Chimica e Biotecnologie Agrarie, Università di Pisa, via del Borghetto 80, I-56124 Pisa, Italy e-mail: alesavio@agr.unipi.it, Tel.: +39-50-571557, Fax: +39-50-598614, IT |
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Abstract: | Changes in some soil biochemical properties were investigated following repeated applications of aerobically digested sewage
sludge (SS) under field conditions over 12 years, and compared with those of an adjacent soil cultivated and amended with
5 t ha–1 year–1 (dry weight) farmyard manure (FYM) for at least 40 years, as well as with those of an adjacent uncultivated soil, in order
to ascertain changes in soil quality. A short-term aerobic incubation was used to determine the potential of the samples to
mineralize the organic C supplied. Results indicated that cultivation caused a reduction in total, humified and potentially
mineralizable organic C, total N, light-fraction (LF) C, total and water-soluble carbohydrates, phenolic compounds, cation-exchange
capacity (CEC), microbial biomass C, specific respiration, hydrolytic and urease activities, and an increase in the heavy
metal content. Total and water-soluble carbohydrates and phenolic compounds expressed as a percentage of total organic C (TOC)
were similar in the differently managed plots. Of the two amendments, FYM treatments showed higher amounts of TOC and N, LF-C,
total and water-soluble carbohydrates, phenolic substances, CEC, specific respiration of biomass, hydrolytic and urease activities,
similar amounts and characteristics of humified organic matter and lower concentrations of Cu, Zn and Cr. Both FYM and SS
were inadequate treatments for the restoration of soil organic matter lost as a consequence of cultivation.
Received: 20 October 1998 |
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Keywords: | Long-term trial Land organic waste disposal Farmyard manure Sewage sludge Soil quality |
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