Full TGIF Record # 19272
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Author(s):Baker, Robert D.; Witt, William; Powell, A. J. Jr.
Title:Persistence of turf herbicides in soil
Source:Kentucky Turfgrass Research. 1990, p. 49-51.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Series:Progress Report 328
Keywords:TIC Keywords: Herbicide persistence; Poa pratensis; Chlorsulfuron; Imazapyr; Prodiamine
Abstract/Contents:Determined persistence of 3 herbicides in a Kentucky bluegrass sod and determined when turfgrasses could be overseeded on an area treated with these herbicides. Herbicides were Telar 750F (Chlorsulfuron) at 0.03 and 0.06, Arsenal 4L (Imazapyr) at 0.5 and 1.0, and Barricade 65WG (Prodiamine) at 0.5 and 1.0 lb ai/Acre, respectively. There were 3 replications. Plots were 10' x 20'. Soil samples were taken from each plot on five dates: 0 days after treatment (DAT), 2 weeks after treatment (WAT), 4WAT, 8WAT and 16WAT. Roundup was applied at each sampling date to nonselectively eliminate all plant growth. Perennial ryegrass was mechanically seeded in the sampled area. The growth of ryegrass was visually rated after the 16WAT ryegrass had emerged. Herbicide concentration in the soil was determined by a corn root bioassay. Herbicide concentrations on each sampling date are provided in a table. Chlorsulfuron persisted approximately 11 weeks for the 0.03 lb ai/A rate and 13 weeks for the 0.06 lb ai/A rate. The GR50 (the time (in weeks) each herbicide remained in the soil to reduce the growth of the bioassay plant by 50%) was 0.18 parts per billion in soil. For chlorsulfuron the seeded ryegrass showed no injury at 8WAT; however the bioassay showed harmful concentrations 8WAT. The variation between the bioassay and field results was because at 8WAT almost all of the chlorosulfuron would have moved below seeding depth. The plots had increasing amounts of growth as time after application increased. There was no growth at 0DAT and full growth at 16WAT. Imazapyr persisted for approximately 15 weeks and 17.5 weeks for the 0.5 lb ai/A rate and the 1.0 lb ai/A rate, respectively. The GR50 for imazapyr was 7.75 part per billion in soil. The plots had growth at 2WAT and 4WAT. There was injury in some plots at both 2WAT and 4WAT. Full growth was seen at 16WAT and zero growth at 0DAT. Prodiamine persisted for 3 weeks for the 1.0 lb ai/A rate. There was partial growth at 0DAT in the 0.51 lb ai/A plots. Growth of ryegrass over the rest of the sampling dates ranged from 70-100%. The plots sprayed with prodiamine at the 1.0 lb ai/A rate had no growth at 0DAT. The injury level decreased from 2WAT to 8WAT. There was no injury 16WAT. Under the conditions of this test, herbicides did not persist in soil to cause injury to perennial ryegrass seeded 16 weeks after herbicide application.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Baker, R. D., W. Witt, and A. J. Jr. Powell. 1990. Persistence of turf herbicides in soil. KY. Turfgrass Res. p. 49-51.
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