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Kyung, Kee Sung,Ahn, Ki Chang,Kwon, Jeong Wook,Lee, Yong Pil,Lee, Eun Young,Kim, Yun Jeong,Fuhr, Fritz,Lee, Jae Koo 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.1
To show the long-term fate of the herbicide mefenacet in rice paddies, [aniline-$^{14}C$]mefenacet was applied to a lysimeter of loamy soil with a depth of 1 m, and rice plants were cultivated for 6 consecutive years according to the conventional methods in Korea. Mineralization of [$^{14}C$]mefenacet to $^{14}CO_2$ and volatilization from the soil surface were 12.01 and 0.02 %, respectively, of the originally applied amount during the first 23 weeks following application. Throughout the 6-year period, the total proportion of $^{14}C$-radioactivity that leached through the lysimeter soil was 0.778 % of the original radioactivity. The total $^{14}C$-radioactivity absorbed and translocated by rice plants throughout the 6 years was 2.46 % of the applied $^{14}C$. Measurement of the $^{14}C$-radioactivity distributed in each part of the rice plant (the straw, the ears without rice grain, the chaff, and the brown rice grain) indicated that the amount of $^{14}C$ in straw was 25.87 times higher than that in brown rice grain over the 6 years. The $^{14}C$-radioactivity remaining in the soil layer after 6 years was 44.58 % of that applied, 91.45 % of which was distributed in the upper 0-20-cm layer. These results strongly indicate that mefenacet moved downward very slowly and more than half of the herbicide applied was released into the air, mainly through mineralization to $CO_2$ in soil during the experimental period.