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Dissipation and Water Activation of UCC-C4243

Published online by Cambridge University Press:  12 June 2017

Terry R. Wright ,
Alex G. Ogg Jr.  and
E. Patrick Fuerst
Terry R. Wright
Affiliation:
Dep. of Crop and Soil Sci., Washington State Univ., Pullman, WA 99164-6420
Alex G. Ogg Jr.
Affiliation:
USDA-ARS, Pullman, WA 99164-6416
E. Patrick Fuerst
Affiliation:
Dep. of Crop and Soil Sci., Washington State Univ., Pullman, WA 99164-6420
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Abstract

Field experiments were conducted in 1992 and 1993 to determine the timing and amount of rainfall required to activate UCC-C4243 applied preemergence. UCC-C4243 at 0, 70, and 140 g ai ha−1 was applied 1, 7, 14, and 21 d before 0.5 or 2 cm of simulated rainfall. Temporary rainshelters protected field plots from natural rainfall during the 21 d dry period. Herbicide activity was determined in the field by seeding lentil, wheat, common lambsquarters, and field pennycress and in the greenhouse by a sugarbeet bioassay of soil samples (0 to 3 cm depth) taken from all plots immediately before irrigation. UCC-C4243 did not injure wheat; however, lentil population was reduced when simulated rainfall occurred within 7 d after application. Lentil injury was greater with higher herbicide rate and higher water level. UCC-C4243 at 70 and 140 g ha−1 reduced populations of both weed species by 75 and 90%, respectively, when either 0.5 or 2 cm simulated rainfall was received within 1 d after herbicide application. Weed control was reduced with a 21 d delay between herbicide application and water activation. The sugarbeet bioassay showed a linear decrease of herbicide activity over time and also with accumulated photosynthetically active radiation. After 17.9 d, herbicide activity on a dry soil surface decreased 50%. Laboratory investigations show that [14C]-UCC-C4243 on glass slides was photodegraded by near ultraviolet light (290 to 400 nm). Volatilization of 14C-labeled herbicide from glass slides was less than 5% after exposure to turbulent air for 48 h.

Keywords

UCC-C4243, 2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]benzoic acid, 1-methylethyl estercommon lambsquarters, Chenopodium album L. #3 CHEALfield pennycress, Thlaspi arvense L. # THLARlentil, Lens esculenta L. ‘Brewer’soft white spring wheat, Triticum aestivum L. ‘Edwall’sugarbeet, Beta vulgaris L. ‘HMWSPM9.’PhotodegradationvolatilityBROTECHEALTHLAR
Type
Soil, Air, and Water
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 149 - 155
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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