Barth, Gerhard:
ISBN 9783899595949

Influence of soil properties on the effect of 3,4 - dimethylpyrazole - phosphate as nitrification inhibitor # Pb., 126 S., 83 Abb., 15 Tab.

SCHLAGWORTE:
nitrification inhibitor
DMPP
soil properties
Nitrifikationshemmstoff
Bodeneigenschaften
3,4 - Dimethylpyrazol - Phosphat

The influence of soil properties, inhibitor concentration, soil matric potential and application form on the nitrification inhibitory effect of 3,4-dimethylpyrazole-phosphate (DMPP) has been investigated. Based on short - term incubation experiments, the inhibitor effect was higher in sandy soils compared with loamy soils. The influence of soil parameters on the relative nitrite formation were best described by a multiple regression model including the sand fraction, soil H+-concentration and soil catalase activity. The adsorption of DMPP to soil components or constituents was found to be an important factor for the inhibitory effect on the ammonium oxidation in short - term incubation studies.

In long - term incubation experiments the efficiency of DMPP in two different soils as dependent on inhibitor concentration, soil matric potential and application form was investigated. Generally, the efficacy of DMPP was higher in the loamy sand soil compared to the silty loam soil particularly in high soil matric potential. Based on these results, DMPP may be a successful nitrification inhibitor, especially in moist coarse textured soils.

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