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Nitrogen movement and transformations in soils as evaluated by a lysimeter study utilizing isotopic nitrogen

Nitrogen movement and transformations in soils as evaluated by a lysimeter study utilizing isotopic nitrogen

Soil Science Society American Proceedings 24(5): 372-376

Ammonium sulfate, labeled with Nl5, Was applied to soils in lysimeters at the rate of 120 lb. of N/acre during each winter of the 2 years of the experiment. Each year, 3 moisture rates, 12, 18, and 24 inches were established on the soils during the 5 months prior to crop seeding. An average of 33 + 6% of the applied N was unaccounted for at the end of 2 years and was assumed to have been denitrified. Dentrification losses were not affected by the moisture treatment imposed. Leaching losses were directly proportional to the amount of water moving through the profile and ranged from 5 to 20% from the low to high moisture rates. Losses of applied N by leaching occurred largely at the expense of crop uptake. The amount of fertilizer N remaining in the soils at the end of the experiment was around 38% and not affected by the moisture treatment.

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