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Additional resources for Antimicrobials and Agriculture. The Proceedings of the 4th International Symposium on Antibiotics in Agriculture: Benefits and Malefits

Sample text

M. resulted in a complete retardation of nitrification up to an incubation time of 84 days. 5mg/kg soil in laboratory completely inhibited the nitrification for 4-5 weeks. In aqueous culture experiments, etridiazol was more bactericidal than nitrapyrin. 5 kg/ha with aqueous urea showed that 13 weeks after injection the crosssection treated with etridiazol contained much less nitrate nitrogen than the cross-section without an inhibitor. Little effect of nitrapyrin on nitrification was apparent after 13 weeks.

ALL VALUES IN kg/ha TO A DEPTH OF 20 cm. 3 technique. 3) from samples taken 6 weeks after November injection show that both inhibitors inhibited nitrification, but had little effect on numbers of viable ammonium oxidizers. 4). The 5-day interval between injection and sam­ pling was long enough for the inhibitor to exert any bactericidal effect, but too short for any recovery from inhibition and for cell numbers to increase. The laboratory experiments indicated that most of the inhibitors tested were not bactericidal, even at high concentrations.

2). Many diverse substances inhibit nitrification (Bundy and Bremner, 1973; G. A. Rodgers Carbon disulphide I- C150 E ï rî / / x en n 1 o z ^ 0 / / // // // // à / * ? % inhibitor per ml medium, respectively Sahrawat, 1980). 1; of these nitrapyrin, etridiazole and dicyandiamide are commercially available. Some mechanisms for their inhi­ bitory properties are reviewed by Hauck (1980). Quinones and substituted quinones can retard the rate of urea hydrolysis to ammonium as well as being nitrification inhibitors.

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