AbstractThe rates of dissipation in soil and chloride‐ion release, of the main components of dichloropropane‐dichloropropene mixtures used as nematicides, were studied in sealed glass containers at different temperatures and moisture conditions. Half‐lives of (Z)‐ and (E)‐1,3‐dichloropropenes at 20°C in soils were found to vary from 3 to 25 days; those of 1,2‐dichloropropane and 2,3‐dichloropropene were about four times and twice as long, respectively. The dissipation rates changed by a factor of about 2 per 10°C change in temperature. Judging from the release rates of waterextractable inorganic chloride in the soil (0‐4% per week), the total degradation of all components applied at normal field rates was extremely slow. This indicated the formation of residues containing covalently bound chlorine. Only in ‘enrichment cultures’ was complet
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