Abstract
A laboratory incubation experiment was carried out to investigate the effects of N fertilizer forms, NOin3sup−,-N vs NHin4sup+-N, and rates of application on C mineralization of an oily waste in a clay-loam soil. Carbon mineralization rates (CMR) were determined from CO2 (measured routinely by gas chromatography) evolved during a seven week incubation. The CMR and cumulative C mineralized (CCM) increased with increasing levels of fertilizer N added. The greatest enhancement in waste C mineralization occurred when the waste-C: fertilizer-N (WC:FN) ratio was in the range 18 to 22:1. Variabilities in estimates of the potentially mineralizable C pool sizes and specific mineralization rate constants showed that these decomposition parameters were altered by N amendment. Of the three fertilizer N sources evaluated, amendment with calcium nitrate produced the greatest enhancement in waste C mineralization, at each WC:FN ratio, followed by urea and ammonium nitrate, respectively.
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