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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #192029
Title: MEASURING THE PERSISTANCE HALOSULFURON METOLACHLOR, AND SULFENTRAZONE USING ANALYTICAL AND BIOASSAY TECHNIQUES FOR BARE-SOIL VERSUS SOIL UNDER POLYETHYLENE MULCH

Author
item CULPEPPER, A - UNIVERSITY OF GEORGIA
item GREY, T - UNIVERSITY OF GEORGIA
item Webster, Theodore

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 2/10/2006
Publication Date: 6/1/2006
Citation: Culpepper, A.S., Grey, T.L., Webster, T.M. 2006. Measuring the persistance halosulfuron metolachlor, and sulfentrazone using analytical and bioassay techniques for bare-soil versus soil under polyethylene mulch [abstract]. In: Proceedings of the Southern Weed Science Society Annual Meeting, January 22-25, 2006, San Antonio, TX. 59:218.

Interpretive Summary:

Technical Abstract: Field studies were conducted to compare herbicide dissipation in bare-soil versus polyethylene mulch environments. Tifton loamy sand soil was treated by injection with MBr followed by application of polyethylene mulch. After removal of the mulch, the entire length of each plot was then treated with herbicide. Half of each plot was then recovered with the same mulch. Soil cores were collected at 1 h, 1, 2, 3, 7, 14, 21, 28, 44, and 66 days after treatment (DAT). Regression analysis was performed for data presentation using the exponential decay equation and half-life estimated. Bioassays were performed for all soil samples using a species deemed sensitive to each herbicide: oat for metolachlor, cotton for sulfentrazone, and canola for halosulfuron. Sulfentrazone dissipation was slower than halosulfuron or metolachlor. This indicates that sulfentrazone could provide nutsedge control when PRE applied to vegetables, but could also have the propensity for carryover concerns (i.e. 2nd crop injury). For polyethylene mulch, halosulfuron concentration remained consistent. However, halosulfuron concentration for bare-soil was half the amount. Regression data indicated that the half lives for bare-soil and soil under polyethylene mulch were 7 and 10 d, respectively. Metolachlor concentrations were similar for soil under the polyethylene mulch system and bare-soil. Sulfentrazone half lives were 20 days for bare-soil and 13 days for soil under polyethylene mulch.