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MICROBIAL ACTIVITY IN SOILS TREATED WITH HEXAZINONE
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1980
Year
EngineeringPesticide-residue AnalysisWeed ControlPlant PathologyBiorational Pesticide8-Week Test PeriodToxicologyEnvironmental MicrobiologyWeed ScienceActive IngredientPest ManagementPharmacologyPhytotoxicitySoil BiotechnologyEnvironmental EngineeringCrop ProtectionMicrobiologyEnvironmental ToxicologyPpm HexazinoneMedicine
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 parts per million of hexazinone to three agricultural soils did not reduce the soil population counts of fungi or bacteria during an 8-week 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 two agricultural soils had no effect on the soil-nitrifying process during a 5-week test period.