Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswarvidyalaya, Mohanpur-741252, West Bengal, India.
Online published on 3 November, 2011.
Field study was conducted during the kharif season to determine the dissipation rate, half-life values of fluchloralin in paddy soil following application as pre-emergent treatment with the recommended dose (@ 1.5 kg a.i./ha) and double the recommended dose (@ 3 kg a.i./ha). Two pseudo first order rate steps were involved in the dissipation and the average half-lives varied from 5.13 to 5.22 days in the first phase and 11.23 days to 11.8 days in the second phase. After 28 days of soil application 94.24 - 94.9% of the fluchloralin residues were lost from the soil. The terminal residues of fluchloralin at harvest in straw and grain were below 0.015 and 0.008 ppm. After 7 days of application, one metabolite 2,6-dinitro-N-n- propyl - Σ, Σ, Σ -trifhioro-p-toluidine could be detected in soil samples.
