Residue of Bensulide in Turfgrass Soil Following Annual Treatments for Crabgrass Control
1967
Bingham, S. W. | Schmidt, R. E.
A series of experiments was used to evaluate bensulide treatments in terms of crabgrass control, soil residue, leaching and effect on seedling establishment. Annual treatments of 16.8 kg/ha (15 lb/acre) of bensulide gave continuous preemergence control of crabgrass (reseeded annually) in bentgrass turf. The turfgrass vigor was improved through crabgrass control as compared to untreated plots with competing crabgrass. Bensulide residue in the soil was determined by a bioassay developed by measuring the rate of root growth of milo from seed. With the granular formulation large amounts of bensulide were found in the soil at eleven months after the fourth annual application. Detectable quantities were obtained to depths of 12.75 cm. The emulsifiable concentrate treatments did not persist for eleven months following the fourth application in detectable quantities in the soil. Soil properties affected the response of milo to bensulide. It was demonstrated that more bensulide was resurface layer (0-2.5 cm) than in soil from lower layers. Milo phytotoxicity was inversely related to organic matter and nutrient content of the soil. Three dates of planting five turfgrass species following herbicide treatment were evaluated. Bensulide affected all species planted on the day of treatment but all species emerged well when planted 30 to 60 days after herbicide application to die soil surface.
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