Abstract
Imazosulfuron is a new post-emergence sulfonylurea herbicide. It is highly active at low application rates to control annual and perennial broad-leaf weeds and sedges in rice. There is increasing concerned about the persistence of pesticide residues in soils, crop produce and subsequent contamination of groundwater. Thus persistence of imazosulfuron residues under field condition was evaluated. Imazosulfuron was applied at 30, 40, 50 and 60 a. i. g ha −1 rates, 4 days after transplanting of rice as pos -emergence herbicide. Soil and plant samples treated with imazosulfuron were collected at 60, 90 and 120 days after herbicide application and analyzed for residues. Rice grains and straw samples were sampled at harvest (120 days). Residues of imazosulfuron in soil were not found after 90 and 120 DAS (days after spraying). Rice grains contained 0.006, 0.009 μg g−1 residues at 50 and 60 g ha −1 application rates. 0.009 and 0.039 application rates. 0.009 and 0.039 μg g−1 residues of imazosulfuron were detected at 50 and 60 g/ha rates respectively in rice straw. Residues of imazosulfuron were not detected applied at 30 and 40 g ha−1 in rice grains and straw, respectively and can be safely applied to the transplanted rice.
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Sondhia, S. Determination of imazosulfuron persistence in rice crop and soil. Environ Monit Assess 137, 205–211 (2008). https://doi.org/10.1007/s10661-007-9741-z
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DOI: https://doi.org/10.1007/s10661-007-9741-z