Nitrification process in soil contaminated with cobalt
2006
Wyszkowska, J. | Kucharski, J. | Kucharski, M.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Microbiology
The effect of soil contamination with cobalt at 200 and 400 mg Co/kg d.m. of soil was analysed in a laboratory experiment. The soil used for the trials was light loam of 7.0 pH. The results suggested that the influence of cobalt on nitrification process depended on the dose of this element applied. The lower rate of 200 mg Co/kg d.m. of soil had little impact of nitrification, while the higher dose 400 mg Co/kg d.m. of soil considerably inhibited the process. The nitrifying activity of soil under the influence of the higher cobalt dose was 2.3-fold depressed at maximum. This effect, however, was short-lived and disappeared on day 60 of the experiment. Cobalt present in excessive amounts in soil contributed to the lowering of the concentration of mineral nitrogen (N-NH4+ + N-NO3-)
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