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Phytotoxic activity of clomeprop in soil and concentration of its hydrolysed metabolite DMPA in soil water

✍ Scribed by Kobayashi, Katsuichiro; Tsukasaki, Yoshihiko; Tongma, Suthep; Shim, Ie Sung

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 185 KB
Volume: 55
Category: Article
ISSN: 1526-498X
DOI: 10.1002/(sici)1096-9063(199904)55:4<474::aid-ps916>3.0.co;2-v

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✦ Synopsis

The relationship between the fate of clomeprop in soil and its phytotoxic activity on the growth of radish (Raphanus sativus) seedlings was investigated in the laboratory. The phytotoxic activity of clomeprop in sea sand was much higher than in non-autoclaved soil, and the phytotoxic activity in non-autoclaved soil was higher than in autoclaved soil. The phytotoxic activity of 2-(2,4dichloro-3-methylphenoxy)propionic acid (DMPA), a hydrolysed metabolite of clomeprop, was higher than that of the latter under both soil conditions. Clomeprop was adsorbed on soil to a greater extent than DMPA. The concentration of clomeprop in soil water of non-autoclaved soil decreased with increase of the DMPA concentration in the soil water in a time-dependent manner. It is suggested that the phytotoxic activity of clomeprop applied to soil is induced mostly by the DMPA concentration in soil water after hydrolytic degradation by soil microbes.

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