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Distribution and Mobility of Herbicide $^{14}C$-Molinate in a Rice-Paddy-Soil Lysimeter  

Park, Byung-Jun (National Institute of Agricultural Science & Technology. RDA)
Kim, Chan-Sub (National Institute of Agricultural Science & Technology. RDA)
Park, Kyung-Hun (National Institute of Agricultural Science & Technology. RDA)
Park, Hyeon-Ju (Research Management Bureau, Rural Development Administration)
Im, Geon-Jae (National Institute of Agricultural Science & Technology. RDA)
Choi, Ju-Hyeon (National Institute of Agricultural Science & Technology. RDA)
Shim, Jae-Han (Division of Applied Bioscience and Biotechnology and Institute of Agricultural Science and Technology)
Ryu, Gab-Hee (National Institute of Agricultural Science & Technology. RDA)
Publication Information
The Korean Journal of Pesticide Science / v.10, no.3, 2006 , pp. 172-182 More about this Journal
Abstract
This study was designed to assess molinate fate in the lysimeter by measuring the total radioactivity in the leachate, evolved $^{14}CO_2$, and $^{14}C$-residues in soil and rice plant. The amounts of applied $^{14}C$ in the leachate from the lysimeter for 20 weeks were 1.05% in 2.31 pore volume (217,465 mL) at the first and 0.34% in the second year, respectively. The amount of $^{14}CO_2$ evolved from the lysimeter accounted for 6.47% and 0.03% of applied $^{14}C$ in the first and second year. The $^{14}C$-activities in the soil layer of the lysimeter were distributed 18.0% (1st) and 13.3%(2nd) in the depth of 0 to 10 cm, 4.3 (1st) and 1.1% (2nd) in the depth of 10 to 20 cm. Most of the applied $^{14}C$ was detected in the top 20 cm soil layer. Total $^{14}C$ in rice plants grown at lysimeter were detected 11.46% of applied $^{14}C$. 11.11% in straw, 0.24% in brown rice grain, 0.08% in chaff and 0.03% in ears were distributed in the first year. Consequently, environmental fate of molinate using lysimeter simulating a paddy rice field were investigated 25.24% in soil, 11.64% in rice plant, 1.05% in leachate, 6.74% in evolved $^{14}CO_2$ and 0.02% in volatilized organic chemicals in the first year.
Keywords
$^{14}C$-molinate; lysimeter; rice plant; rice-paddy-soil; distribution; mobility;
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Times Cited By KSCI : 1  (Citation Analysis)
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