Sugar beet herbicides and soil nitrification |
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| Authors: | M Tena R Garrido M Magallanes |
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| Institution: | Cátedra de Bioquímica y Química Agrícola, E. T. S. Ingenieros Agrónomos, University of Córdoba, Córdoba, Spain |
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| Abstract: | The effects of phenmedipham, propham, carbetamide, lenacil and benzthiazuron on soil nitrification was studied in the laboratory using a perfusion technique. The nitrification process was markedly retarded at a phenmedipham concentration of 50–500μg g?1 soil, so that 55–150 days were required for complete oxidation of supplied NH+4-N as compared with 33 days for the untreated control. Phenmedipham caused a reduction in both the maximum population and the proliferation rate of nitrifying organisms, as evaluated from kinetic parameters. These inhibitory effects showed a low persistance probably due to herbicide breakdown. The effects of 100 μg g?1 soil of propham, carbetamide, lenacil or benzthiazuron on the nitrification process was very weak, although the kinetics of the nitrification process was affected by all these herbicides. |
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