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Verhalten von Fluroxypyr im Boden: I. Abbau unter Labor‐ und Gewächshausbedingungen
Author(s) -
LEHMANN R. G.,
MILLER J. R.,
OLBERDING E. L.,
TILLOTSON P. M.,
LASKOWSKI D. A.
Publication year - 1990
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1990.tb01724.x
Subject(s) - loam , soil water , chemistry , incubation , moisture , metabolite , environmental chemistry , hydrolysis , water content , pesticide , greenhouse , agronomy , zoology , environmental science , soil science , biochemistry , biology , organic chemistry , geotechnical engineering , engineering
Summary: Fluroxypyr‐MHE (methylheptyl ester) was added to four soils and incubated at 26 ± 1°C and approximately 0.1 MPa moisture. After initial rapid hydrolysis of the ester to fluroxypyr, fluroxypyr degraded with half‐lives of 12, 12, 23, and 7 days in Barnes loam, Catlin silt loam, Hanford sandy loam, and Mhoon clay soils, respectively. Two metabolites (4‐amino‐3,5‐dichloro‐6‐fluoro‐pyridin‐2‐ol and 4‐amino‐3, 5‐dichloro ‐ 6 ‐ fluoro ‐ 2 ‐methoxypyridine) were identified, with the pyridinol at its maximum concentration after 2 to 4 weeks of incubation, and the methoxypyridine after 8 weeks. Degradation rates of fluroxypyr and its pyridinol were not significantly altered by diurnally varying soil temperature (21°C to 32°C) or moisture, nor by the presence of growing grass. Methoxypyridine dissipation was more rapid under greenhouse conditions, suggesting that laboratory studies underestimated the dissipation rate of this metabolite.