Kinetics of Nitrification of Various Amounts of Ammonium added to Soils

Amsterdam

1990

S. 51-55

4 Abb.,3 Tab., 16 Lit. Ang.

Bandaufführung

162674

Where the amount of ammonium added was <10 μg Ng−1, changes with time in the concentrations of ammonium and nitrate in the Brown Andosols could be described by the model that includes Michaelis-Menten kinetics on the assumption that the growth of the nitrifiers was negligible. The half-saturation constant and maximum velocity of nitrification were calculated to be 0.86 μg Ng−1 and 3.3 μg Ng−1 day−1, respectively. Where the amount of ammonium added was 200 μg Ng−1 and 400 μg Ng−1, changes with time in the concentration of the nitrate in the Brown Andosols and ordinary andosols were described well by the model that includes the growth of the nitrifiers. The initial velocities of the nitrification rate were calculated when the initial concentration of ammonium in soils was >300 μg Ng−1. The higher the initial concentration of ammonium, the lower were the initial velocities of nitrification