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- W1983842600 abstract "Reclaiming lands mined for lignite in east Texas requires large inputs of N fertilizers. However little is known about the relative effects of NH+4-N vs. urea-N on nitrifying bacteria and rates of nitrification in soils undergoing reclamation. We conducted a field study to determine nitrification potentials, enumerate nitrifying bacteria and to determine the relationship between the two in mixed-overburden. Newly leveled and 1- to 8-yr-old spoils near Fairfield, TX, were fertilized with 244 kg N ha-1 of (NH4)2SO4 (AS) or urea and concentrations of NH+4, NO-2, and NO-3 in the overburden were monitored. Nitrification potentials and most probable numbers (MPN) of NH+4- and NO-2-oxidizing bacteria were measured. Nitrification potentials were lowest in fresh spoil and increased with age of site. Nitrification rates at the 1-yr-old site were equivalent to those at an adjacent unmined site. Nitrification of NH+4-N and urea-N occurred at similar rates in the field (means 2.6 and 2.7 mg NO-3-N kg-1 soil d-1, respectively) but there tended to be more NO-3 in spoil fertilized with urea. Nitrifiers regained pre-mining levels within one year ranging from log10 MPN 3 to 6 g-1. Nitrifiers were least abundant at the fresh site (≈log10 3) but were similar at the other sites ranging from log10 5 to 6. Numbers of nitrifying bacteria and nitrification potentials were highly correlated (r = 0.75 to 0.94). Urea and AS produced similar responses for the parameters measured, indicating urea to be as suitable an N source as AS in the reclamation process." @default.
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- W1983842600 date "1996-03-01" @default.
- W1983842600 modified "2023-10-14" @default.
- W1983842600 title "Response of Nitrification and Nitrifying Bacteria in Mine Spoil to Urea or Ammonium Sulfate" @default.
- W1983842600 doi "https://doi.org/10.2136/sssaj1996.03615995006000020020x" @default.
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