Residue and bio-efficacy evaluation of controlled release formulations of metribuzin against weeds in wheat.
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 (T(9)) 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 (T(9)) 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).
Kumar
Jitendra
J
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, 110 012, India. jitendrakumar7@yahoo.com
Nisar
Keyath
K
Shakil
N A
NA
Sharma
Rajvir
R
D000383:Agriculture; D003692:Delayed-Action Preparations; D006540:Herbicides / Q000032:analysis / Q000633:toxicity*; D010573:Pesticide Residues / Q000032:analysis*; D031783:Phalaris / Q000187:drug effects; D012989:Soil Pollutants / Q000032:analysis*; D014227:Triazines / Q000032:analysis / Q000633:toxicity*; D014908:Triticum / Q000737:chemistry*
D003692:Delayed-Action Preparations; D006540:Herbicides; D010573:Pesticide Residues; D012989:Soil Pollutants; D014227:Triazines; C009235:metribuzin