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Pakistan Journal of Biological Sciences
Year: 2000  |  Volume: 3  |  Issue: 1  |  Page No.: 104 - 109

Movement, Persistence and Uptake by Plants of 14C-labelled Cyfluthrin

A. Lodhi, N.N. Malik and F. Azam    

Abstract: A field lysimeter experiment was conducted to study the uptake by plants, dissipation and movement in soil of 14C-cyfluthrin (active ingredient of Baythroid, an insecticide produced by Bayer, Germany). Cotton and wheat plants were grown in succession to study the uptake of 14C. The chemical was worked well into the soil supporting the growth of a healthy cotton plant. The plant harvested at maturity contained 0.376 percent of the applied 14C; a major portion (ca 65 percent of the total) of the 14C being located in the stem portion. Wheat plants grown after cotton contained 0.11 percent of the initially applied 14C.
Dissipation of 14C from the soil-plant system was fairly rapid and after 9 weeks (during growth of cotton), ca 50 percent of the applied 14C was unaccounted. Subsequent losses were slower and during the remaining study period of 29 weeks, a further decrease of only 10 percent of the applied 14C occurred. Wheat growth and organic amendment caused a decrease in the loss of 14C from the soil-plant system. At all sampling intervals, a greater proportion of 14C was restricted to the top 0-10 cm layer and the amount consistently decreased with depth. In general, >80 percent of the 14C determined in soil at different sampling intervals was present in forms non-extractable with methanol.

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