Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 2, Pages 863-871Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.09.010
Keywords
Bovine manure; Sewage sludge; Compost; N mineralization; Kinetic models
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Nitrogen mineralization kinetics were compared in three different soils (pH values: 5.2, 7.1 and 8.6) when treated with bovine manure (BM) and sewage sludge (SS) composts. The soil-compost mixtures were kept at a controlled moisture content of 60% of their water holding capacity (WHC) and were incubated in the dark at 25 C for 2 years. Five mathematical models were compared (simple exponential, double exponential, special model, hyperbolic and parabolic), using as experimental data the mineralized N accumulated during 360 and 720 days of incubation. The results showed that the best fit for describing the mineralization of organic N from the compost after 1 year of experimentation was obtained with the simple exponential model. However, the special model showed the best fit for data from 2 years of incubation and thus better reflected organic N mineralization over a longer time-span. This suggested that the organic N in the two composts was made up of two organic pools of different degrees of stability. (C) 2010 Elsevier Ltd. All rights reserved.
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