ISSN:
1573-0867
Keywords:
Ammonium concentration
;
Incubation experiments
;
Kinetic model
;
Lysimeter experiments
;
Nitrification
;
Maize (Zea mays)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Lysimeter experiments with maize and incubation experiments showed that increased ammonium concentrations in soil reduced nitrification rates. A modified Lees and Quastel kinetic model was proposed for predicting the relation between initial ammonium concentration in soil and nitrification rate. A term Mi strongly dependent on initial ammonium concentration ([NH40]) was introduced into the model which took the form: dy/dt = R(A − y)(Mi + y), where R is a rate constant, y represents the concentration of formed nitrate and A is an asymptotic value of initial ammonium concentration. Mi was obtained by a curve fitting procedure applied to experimental data. An exponential decay of Mi with [NH4]0 was formulated. The modified model thus obtained provides an effective tool for predicting nitrification rates related to a wide range of ammonium concentrations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01050278
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