TOLERANCE AND RESIDUE STUDIES OF TRIALLATE IN LENTILS

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Abstract
The tolerance of lentils (Lens culinaris Medic.) to both preplant and postplant spring incorporation of the wild oat herbicide triallate [S-(2,3,3-trichloroallyl) diisopropyl-thiocarbamate] was studied at two locations. Seed yield, maturity and stand density were not affected by application rates considered adequate for effective wild oat (Avena fatua L.) control. An analytical method for determining triallate residues in lentil green tissue and mature grain was developed. Using electron-capture gas chromatographic detection, the limit of detection, based on a 1-g fresh-weight sample, was 20 ppb. Recoveries were in the order of 75% at the 50 ppb fortification level. Triallate residues did not exceed 20 ppb in any of the samples.

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