Side-effects of sequentially- and simultaneously-applied pesticides on non-target soil microorganisms: Laboratory experiments
Identifieur interne : 000E83 ( Istex/Curation ); précédent : 000E82; suivant : 000E84Side-effects of sequentially- and simultaneously-applied pesticides on non-target soil microorganisms: Laboratory experiments
Auteurs : Evi Schuster [Allemagne] ; D. Schröder [Allemagne]Source :
- Soil Biology and Biochemistry [ 0038-0717 ] ; 1990.
Abstract
The changes of microbial activity in response to simultaneous and sequential applications of several pesticides were studied in a laboratory experiment. The simulation of a complete plant protection system including two herbicides [Dichlorprop, Roundup (R)], three fungicides [Sportak Alpha, Bayleton DF (B). Corbel] one insecticide [Pirimor (P)] and one growth regulator (Cycocel) only induced minor effects that increased after the third pesticide treatment (B). Data could not be translated to field conditions primarily due to a low microbial activity of the soil used in the laboratory experiment.The combination of pesticides (B, P and R) showed interactions that were not consistent with time. The combination of B with R was more inhibitory than the combination of all three substances. At high dosages, side-effects were completely dominated by the strong and irreversible inhibitions exerted by B. Sequential applications of pesticides often resulted in stronger side-effects as compared to simultaneous application. The results are discussed with respect to an assessment of the possible hazards due to multiple pesticide applications in modern agriculture.
Url:
DOI: 10.1016/0038-0717(90)90116-H
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<front><div type="abstract" xml:lang="en">The changes of microbial activity in response to simultaneous and sequential applications of several pesticides were studied in a laboratory experiment. The simulation of a complete plant protection system including two herbicides [Dichlorprop, Roundup (R)], three fungicides [Sportak Alpha, Bayleton DF (B). Corbel] one insecticide [Pirimor (P)] and one growth regulator (Cycocel) only induced minor effects that increased after the third pesticide treatment (B). Data could not be translated to field conditions primarily due to a low microbial activity of the soil used in the laboratory experiment.The combination of pesticides (B, P and R) showed interactions that were not consistent with time. The combination of B with R was more inhibitory than the combination of all three substances. At high dosages, side-effects were completely dominated by the strong and irreversible inhibitions exerted by B. Sequential applications of pesticides often resulted in stronger side-effects as compared to simultaneous application. The results are discussed with respect to an assessment of the possible hazards due to multiple pesticide applications in modern agriculture.</div>
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