Availability of urea to autotrophic ammonia-oxidizing bacteria as related to the fate of 14C- and 15N-labeled urea added to soil

@article{Marsh2005AvailabilityOU,
  title={Availability of urea to autotrophic ammonia-oxidizing bacteria as related to the fate of 14C- and 15N-labeled urea added to soil},
  author={K. L. Marsh and Gerald K. Sims and Richard Lesley Mulvaney},
  journal={Biology and Fertility of Soils},
  year={2005},
  volume={42},
  pages={137-145}
}
Nitrate has been found to accumulate more rapidly in soils fertilized with urea than with inorganic sources of NH4+, despite the fact that nitrification must be preceded by hydrolytic decomposition. For acidic conditions, this finding has been attributed to limited uptake of NH4+ by ammonium-oxidizing bacteria (also reported herein), suggesting an advantage for direct utilization of a nonionizable N substrate such as urea. If the same advantage applies to urea-C, nitrification of urea-N would… 
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