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Soil persistence of dinitramine


, : Soil persistence of dinitramine. Weed Science 28(6): 650-654

The effects of soil temperature, moisture and herbicide concentration on the rate of degradation of dinitramine (N4,N4-diethyl-.alpha.,.alpha.,.alpha.-trifluoro-3,5-dinitrotoluene-2,4-diamine) were measured in clay loam and sandy loam in the laboratory. In sandy loam, the rate of degradation increased with increasing temperature. In clay loam, the rate of degradation increased from 10 to 30.degree. C and decreased at 40.degree. C. Soil content influenced the rate of degradation in the following order: 22 > 11 .mchgt. 2.2% (air-dry) for clay loam and 12.0 = 6.0 .mchgt. 0.5% (air-dry) for sandy loam. First-order half-lives ranged from 3.2 at 30.degree. C to 47 wk at 10.degree. C in clay loam, and 2.3 at 40.degree. C to 31 wk at 10.degree. C in sandy loam. Applications in 2 yr did not cause buildup of dinitramine in the field. A mathematical model was used in an attempt to correlate laboratory and field data.

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