Title: The Influence of Low Temperature and Various Concentrations of Ammonium Nitrate on Nitrification in Acid Soils
Abstract: Abstract Several cultivated, acid soils were limed to pH 6.0 to 6.4, treated with 100 ppm. NH 4 ‐N as NH 4 NO 3 , and incubated for 12 weeks at low and at near‐optimum temperatures for nitrification. In sandy soils, nitrate accumulation at 42°F. was either completely suppressed or delayed for several weeks. In a clay loam incubated at 37°F. nitrates accumulated at a very slow rate throughout the 12‐weeks but at 47°F., after a 6‐week delay period, the accumulation proceeded at a rapid rate. The great influence of differing soil characteristics on nitrification is shown by the fact that nitrate accumulation in the clay loam at 37°F, was about two‐thirds of that occuring in a loamy sand at 90°F. When the amount of added NH 4 NO 3 was increased to 200 or 400 ppm. NH 4 ‐N, nitrate accumulation, with one exception, failed to occur at 42°F. in sandy soils and was delayed in the clay loam. Even at 90°F., nitrate accumulation in the sandy soils, but not in the clay loam, was delayed and the rate reduced.
Publication Year: 1964
Publication Date: 1964-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 26
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