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Nitrogen status and transformations in coal mine spoil

โœ Scribed by S. S. H. Shah; T. H. Flowers; I. D. Pulford

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
536 KB
Volume
2
Category
Article
ISSN
1085-3278

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โœฆ Synopsis

A detailed study was undertaken to measure mineral nitrogen status, mineralization rate of carbon and nitrogen, nitrification rate and fixation of added ammonium on 90 samples of coal mine spoils collected throughout Central Scotland. The inorganic nitrogen status of the spoils was very low (mean 3.4 mg N kg-'). The rate of carbon dioxide evolution was high compared to the low rate of nitrogen mineralized, resulting in a mean mineralized C:N ratio of 178. Nitrification of added ammonium was measurable on only half of the samples studied. Spoil with p H < 4.8 showed no nitrification of added ammonium. However, on some sites above this p H no net nitrification was measured, which suggested the absence of nitrifying bacteria. A considerable amount of applied ammonium nitrogen was lost either as a result of ammonium fixation by clay minerals, or assimilation by the heterotrophic population due to the wide mineralizable C:N ratio.

๐Ÿ“œ SIMILAR VOLUMES

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15 Environment (pollution, health protection, safety) than that of "'C'\ which is in disagreemtnt with the usual findings. In the follow,ing years. "'Cs. uptake by plants was reduced by a factor in excess of than SO, wheras the soil-to-plant concentration ratio of "'ST increased within one order of