ISHS Acta Horticulturae 152: II International Symposium on Soil Disinfestation
SOME PHYSICO-CHEMICAL ASPECTS OF METHYL BROMIDE BEHAVIOUR IN SOIL. |
| Author: | J.C. ARVIEU |
| Abstract:
The behaviour and bioactivity of M.B. in soil depend on several physico-chemical interactions. These interactions determine the concentration of available pesticide and residues rate. Experimental studies on a series of soils show that M.B. adsorption is mainly due to organic matter. Linear adsorption isotherms were observed, the slopes of which are correlated to the soils organic matter content. The rate and magnitude of the adsorption are such that a significant part of the pesticide may be adsorbed, specially in horticultural soils. Furthermore M.B. adsorption is almost irreversible ; this could lead to pesticide persistence in the form of bound residues. The principal pathway of M.B. conversion in soil is undoubtedly through reaction with soil organic matter. However the reaction speed depends on the nature, composition and evolution of soil organic matter, so that it appears impossible at present to propose a general description of M.B. degradation. | |
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