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Residue and Bio-Efficacy Evaluation of Controlled Release Formulations of Metribuzin Against Weeds in Wheat

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Abstract

Controlled release formulations of metribuzin in polyvinyl chloride, (emulsion); carboxy methyl cellulose, CMC and carboxy methyl cellulose- kaolinite composite, CMC-KAO are reported. The MET-CMC-KAO-3 (T9) formulation provided a superior control (76.1%) of weeds in field grown wheat in comparison to metribuzin 75 DF (57.14%) at the dose (350 g a.i. ha−1) after 90 days of sowing. The treatment (T9) reduced the dry weight of the weed flora after 30 days of sowing (4.0 g m−2) and significantly superior over metribuzin 75 DF (6.0 g m−2) and control (17.72 g m−2). There were nil to negligible metribuzin residue in soil at harvest of wheat crop and were within prescribed limit of 10 mg L−1 in drinking water (EPA).

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Acknowledgments

Keyath Nisar is grateful to Indian Agricultural Research Institute, New Delhi, and authorities for granting him senior fellowship for pursuing the doctoral program.

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Correspondence to Jitendra Kumar.

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Kumar, J., Nisar, K., Shakil, N.A. et al. Residue and Bio-Efficacy Evaluation of Controlled Release Formulations of Metribuzin Against Weeds in Wheat. Bull Environ Contam Toxicol 85, 357–361 (2010). https://doi.org/10.1007/s00128-010-0091-0

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Keywords

  • Controlled release metribuzin
  • Herbicidal activity
  • Residue