Journal article

Publication year: 1992

Pages: 61-64

Journal: Biology and Fertility of Soils

Volume number: 13

Issue number: 2

ISSN: 0178-2762

DOI Link: https://doi.org/10.1007/BF00337336

Publisher: Springer

Abstract: 
The kinetics of dicyandiamide (DCD) decomposition were studied (at 80% water-holding capacity) in pretreated and non-pretreated soils, using model experiments. DCD was added in different concentrations (6.7, 16.7, and 33.3-mu-g DCD-N g-1 dry soil) and incubated at various temperatures (10-degrees, 20-degrees, and 30-degrees-C). Additionally, DCD decomposition was examined in sterile soil (with or without Fe2O3) after inoculation with a DCD-enrichment culture. In the sterile variants (30-degrees-C) the applied dicyandiamide concentration remained constant, even after 36 days. In the sterilized and reinoculated variant, DCD disappeared within 7 days. Addition of Fe2O3 powder to the sterilized soil had no effect on DCD degradation. In the pretreated soils, DCD mineralization started immediately at all temperatures and concentrations without a lag phase. A temperature increase of 10-degrees-C doubled the mineralization rate. The mineralization rates were independent of the initial concentrations. In the non-pretreated soils (except at 30-degrees-C with 16.7 and 33.3-mu-g DCD-N g-1 dry soil) DCD decreased only after a short (30-degrees-C) or a long (10-degrees-C) lag phase. These results suggest that an inducible metabolic degradation occurred, following zero-order kinetics.

Harvard Citation style: RAJBANSHI, S., BENCKISER, G. and OTTOW, J. (1992) EFFECTS OF CONCENTRATION, INCUBATION-TEMPERATURE, AND REPEATED APPLICATIONS ON DEGRADATION KINETICS OF DICYANDIAMIDE (DCD) IN MODEL EXPERIMENTS WITH A SILT LOAM SOIL, Biology and Fertility of Soils, 13(2), pp. 61-64. https://doi.org/10.1007/BF00337336

APA Citation style: RAJBANSHI, S., BENCKISER, G., & OTTOW, J. (1992). EFFECTS OF CONCENTRATION, INCUBATION-TEMPERATURE, AND REPEATED APPLICATIONS ON DEGRADATION KINETICS OF DICYANDIAMIDE (DCD) IN MODEL EXPERIMENTS WITH A SILT LOAM SOIL. Biology and Fertility of Soils. 13(2), 61-64. https://doi.org/10.1007/BF00337336