Abstract
Nitrification of 100 p.p.m. added NH4-N was studied in two soils of Georgia. Moisture levels tried were equivalent to those equilibrated at soil tension of 15, 8, 4, 2, 0.3, 0.0 bars on the release curve and a flooded condition. Moisture was applied as crushed ice in a cold room at −5 °C. Samples were incubated at 25 °C with a constant stream of humidified air passing over them. Nitrification rate in Cecil sandy loam increased as the soil moisture content increased from 15 to 2 bars and decreased thereafter. Marked nitrification occurred even under flooded conditions. Unaccounted-for nitrogen amounted to 30% under flooded condition. Nitrification in Norfolk loamy sand was exceptionally high, nitrification being 73% complete within 2 weeks at 15 bars. There was practically no difference in nitrification at 15 to 0.3 bar. Unaccounted-for nitrogen amounted to over 60% in flooded soils.
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