MICROBIAL ACTIVITY IN SOILS TREATED WITH HEXAZINONE

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Abstract
The active ingredient in Velpar weed killer is 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione (hexazinone). Adding 10 ppm of hexazinone to 3 agricultural soils did not reduce the soil population counts of fungi or bacteria during an 8 wk test period. In all soils, the distribution of a given fungus type was similar in treated and untreated soils, indicating that hexazinone did not alter the numbers of any given fungus component in the soil. In an agar plate bioassay test, hexazinone showed little or no fungitoxicity at treatment rates up to 100 ppm. A nitrification study showed that the addition of 5 and 20 ppm hexazinone to 2 agricultural soils had no effect on the soil-nitrifying process during a 5 wk test period.

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