02068naa a2200253 a 450000100080000000500110000800800410001910000160006024501410007626000090021730000100022652013720023665000220160865000250163065000140165565000310166965000090170065300220170965300110173165300150174270000170175770000150177477300250178912798732025-04-22       1986    bl uuuu     u00u1 u    #d1 aFENG, J. C.  aPersistence, mobility and degradation of hexazinone in silt loam soils in the Peace River area, British Columbia.h[electronic resource]  c1986  a17 p.  aA white spruce plantation near Stewart Lake, Peace River area, British Columbia was treated with hexazinone, 3-cyclohexyl-6-(dimethylamino)-l-raethyl-l,3,5-triazine-2,4(lH,3H)-dione, at 4.3 kg ai/ha by a helicopter equipped with a MICROFOIL® boom. Soils from within, and at 20 and 40 m (5-10% gradient) outside of the treatment block were moni tored for 104 days after treatment for residues of hexazinone and its metabolites A, 3-(4-hydroxycyclohexyl)-6-(dimethylamino)-l-raethyl-l,3,5- triazine-2,4(lH,3H)-dione and B, 3-cyclohexyl-6-(methylamino)-l-methyll,3,5-triazine-2,4(lH,3H)-dione. Soil samples, subdivided into surface organic, and 0-15 cm and 15-30 cm mineral layers, were collected before and at 0, 9, 23, 55, 70, 104 days after application. Hexazinone degrad ation was rapid, decreasing from 7.12 yg/g (9 days) to 2.09 y g/g (104 days). Metabolite A and B concentrations (30-50% and 0-12% that of hex azinone, respectively) indicated higher hydroxylation than demethylation activity in this silt loam soil. Leaching of hexazinone from the sur face organic to the underlying 0-15 cm mineral soil layer was found only in the 55-day sample. No residues were detected for other sampling dates in this mineral layer and the layer below (15-30 cm). No positive evidence of lateral movement was found in samples from 20 m and 40 ra outside of the treated block  aÁrvore Conífera  aCromatografia Gasosa  aHerbicida  aPersistência de Pesticida  aSolo  aAnálise residual  aForest  aMobilidade1 aREYNOLDS, P.1 aTESKEY, K.  tFPMI File Report 76.