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Effects of Glufosinate-Ammonium to Earthworms, Soil Microorganisms and Crops  

Kim, Yong-Seog (Safety Assessment Center, Korea Testing and Research Institute for Chemical Industry)
Jeon, Yong-Bae (Safety Assessment Center, Korea Testing and Research Institute for Chemical Industry)
Choi, Hae-Jin (Division of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Kim, Song-Mun (Division of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Kim, Sung-Min (Research Center, Bayer Crop Science Korea)
Publication Information
The Korean Journal of Pesticide Science / v.10, no.2, 2006 , pp. 76-83 More about this Journal
Abstract
In order to investigate the impacts of non-selective herbicide, glufosinate-ammonium (ammonium 4-[hydroxy(methyl)phosphinoyl] -DL-homoalaninate, GLA) to the non-target organisms, earthworm was exposed to GLA in the field soil for a month, and microbial populations in the soil were investigated after application of GLA. Simultaneously, the residues of GLA and its metabolite, 3-MPP were analyzed in the same soil. Meanwhile, to elucidate the influence of GLA to the growth of non-target crops incase of inter-furrow application, the amounts of carotenoid, chlorophyll, amino acid, proteins and sugars in the leaves of potato and chinese cabbage grown in the same field were investigated. In result, the dead earthworm was not observed during the test period, and the increasing rates of bodyweight were $9.410{\sim}11.603%$ in GLA-treated plots and 5.645% in GLA-untreated plots. The populations of fungi, bacteria and actinomycetes in the GLA-treated soils were $6.2{\times}10^4$, $1.5{\times}10^6$ and $5.7{\times}10^4$, respectively. They maintained relatively similar levels to the control which were $3.7{\times}10^4$, $3.7{\times}10^5$ and $3.7{\times}10^4$, respectively. In residue analysis, the limit of detection of GLA was 0.02 mg $kg^{-1}$, that of 3-MPP was the same level, and the half-life of GLA was 15 days in sandy clay loam soil. This result indicates that GLA was degraded very quickly in field soil. On the other hand, the amounts of physiological, biochemical components such as carotenoid, amino acid, chlorophyll, protein and sugar were ranged from 90.0 to 104.3% in potato and from 99.0 to 112.7% in chinese cabbage. Comparing with hand-weeded plots, it is indicated that GLA had not affected to the growth of non-target crops when applied at inter-furrow in crops-growing field.
Keywords
glufosinate-ammonium; earthworm; soil microorganism; herbicidal activity;
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