Dissipation of soil fumigants from soil following repeated applications
Article first published online: 11 JUL 2013
© 2013 Society of Chemical Industry
Pest Management Science
How to Cite
Triky-Dotan, S. and Ajwa, H. A. (2013), Dissipation of soil fumigants from soil following repeated applications. Pest. Manag. Sci.. doi: 10.1002/ps.3586
- Article first published online: 11 JUL 2013
- Accepted manuscript online: 6 JUN 2013 12:20PM EST
- Manuscript Accepted: 6 JUN 2013
- Manuscript Revised: 12 APR 2013
- Manuscript Received: 30 NOV 2012
- soil disinfestation;
- methyl bromide alternatives;
- methyl isothiocyanate;
The dissipation of pesticides in soil and the occurrence of accelerated degradation following repeated applications are well-known phenomena with many pesticides, but much less so with soil fumigants. The fate of various soil fumigants was studied in different agricultural soils following repeated applications of chloropicrin.
Fumigant dissipation reflected by Σconcentration × time (ΣC × T) and half-life values varied widely among the tested soils. Methyl iodide (MI) had the slowest dissipation rate compared with other fumigants in all tested soils. Elimination of biotic agents by soil sterilization prior to MI application did not affect MI concentration in Oxnard soil. Clay content and fumigant dose (ΣC × T values) of chloropicrin, 1,3-dichloropropene and MI were significantly correlated. No significant correlations were found between soil properties and ΣC × T values following metam sodium and methyl bromide (MBr) application.
The fate of the tested soil fumigants is highly dependent on and specific to the fumigant, previous fumigant application and soil type. This study suggests that biotic factors are more essential in the dissipation of metam sodium and MBr than abiotic factors. By contrast, MI dissipation from the tested soils is affected more by abiotic factors than by biotic activities. © 2013 Society of Chemical Industry.