ISHS Acta Horticulturae 152: II International Symposium on Soil Disinfestation
EVOLUTION AND ACCUMULATION OF INORGANIC BROMIDE RESIDUES IN SOIL AND PLANT AFTER LOCALISED AND REPEATED APPLICATIONS OF METHYL BROMIDE |
| Authors: | J.C. Lavergne, A. Cuany, J.C. Arvieu |
| Abstract:
According to the laws and factors of Methyl bromide degradation, the release of inorganic bromide residues in soil depends mainly on pesticide concentration, time of persistence and organic matter content. Consequently it must be vary with soil conditions and methods or doses of application. The first experiment reported here illustrates the effects of these factors on vertical and lateral distribution of bromide residues in soil after different waiting periods, following strip treatment under polyethylene cover. Natural leaching of bromide ions by rain water is also studied. The second experiment concerns bromide absorption by plants after localised application repeated yearly during a crop rotation. The maximum absorption is observed during the year following the last treatment. It appears that this accumulation of inorganic bromide in leaves is much higher than in fruits. Bromide content of subsequent crops is much lower, even after repeated treatments. Consequently, it would be advisable to grow fruit vegetables immediatly after treatment and leaf vegetables later in the crop rotation. | |
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