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Data were collected that are needed to simulate soil fumigation with metham‐sodium with computation models. The rate of conversion of metham‐sodium into methyl isothiocyanate was dependent on temperature and soil type, and conversion was usually completed within a few hours. In comparison with dichloropropene, there was a higher water/gas distribution ratio and thus a slower vapour diffusion. Adsorption from the water phase onto the solid phase was weaker. The first‐order rate equation described the decomposition of methyl isothiocyanate and the half‐lives varied from a few days to a few weeks according to temperature and soil type.

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