Accelerated degradation of the herbicide EPTC in the soil after annual application
1994
Naber, H. (Landbouwuniversiteit Wageningen (Netherlands). Vakgroep Plantenoekologie en Bodembiologie) | Weerd, S.C.H.N. van de | Straathof, H.J.M.
In the Netherlands a strong decrease of effectiveness of the herbicide CAPSOLANE (ai. EPTC) was found in 1985 after the soil was treated in the years before with the same herbicide. Especially for the control of yellow nutsedge (Cyperus esculentus) in corn this was a set-back. To investigate whether accelerated degradation can be induced, a field experiment was started in 1986 where EPTC was applied 1-4 years. In 1992 the content of EPTC in the soil was investigated by measuring the reduction of the shootlength of wheat in a bioassay. The content of the herbicide EPTC in soil which had been treated annually for 2 years, decreased significantly faster. After annual application for 3 and 4 years EPTC degraded even faster. By sterilization of the adapted soil it could be proved that microorganisms are responsible for the accelerated degradation of EPTC. Cross-adaption with prosulfocarb of EPTC-adapted soils was not confirmed. Accelerated degradation in metham-sodium adapted soil was also not found. Different microorganisms are responsible for degrading metham-sodium and EPTC
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