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The present investigation was undertaken to generate information about the residue levels and degradation rate of metalaxyl from Chinese cabbages (Brassica campestris) grown under greenhouse conditions. Metalaxyl of 25% wettable powder was applied with dilution of recommended and double doses to the crop. The Chinese cabbage shoots were harvested immediately after this application and at regular intervals over a 10-day. After harvesting, the metalaxyl residue was analyzed using gas chromatography equipped with a nitrogen-phosphorus detector. Initially deposited amount of the chemical in/on the crop right after application with recommended and double doses were 7.1 and 14.7 ㎎ㆍ㎏?¹ respectively. Ten days later, the residue had declined substantially to 0.1 and 0.5 ㎎ㆍ㎏?¹, respectively. These concentrations were below or approach the maximum residual limit (MRL = 0.5 ㎎ㆍ㎏?¹ for Chinese cabbage) established by the World Health Organization (WHO), respectively. The estimated dissipation half-life on the Chinese cabbages was 2.1 and 2.3 days, respectively. Thus, a 10-day interval following the spraying of metalaxyl on Chinese cabbages grown under greenhouse conditions was adequate to reduce the residue to levels below the MRL set by the WHO.

목차

Abstract
Introduction
Materials and Methods
Results and Discussion
Conclusion
Acknowledgement
Literature Cited

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UCI(KEPA) : I410-ECN-0101-2009-525-016949314