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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #192031
Title: DISSIPATION OF FIELD APPLIED HERBICIDES FROM LOW DENSITY POLYETHYLENE MULCH

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

Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/12/2006
Publication Date: 2/13/2006
Citation: Grey, T.L., Culpepper, A.S., Webster, T.M., Mantri, N. 2006. Dissipation of field applied herbicides from low density polyethylene mulch [abstract]. Weed Science Society of America Abstracts. 46:94.

Interpretive Summary:

Technical Abstract: Field studies evaluated dissipation of herbicides from low density polyethylene mulch (LDPM). Herbicide dissipation was measured under dry conditions and following irrigation events. Halosulfuron, paraquat, carfentrazone, glyphosate, and oxyfluorfen were applied to black 1.5-mil LDPM at concentrations equivalent to 1X rates. LDPM was harvested 1 hour after treatment (HAT) then sampled up to 5 consecutive rain-free (RF) days after treatment (DAT) to determine the level of herbicide. In a separate experiment, treated LDPM was harvested 1 HAT, then washed off (WO) with sprinkler irrigation (1 cm), sampled 3 HAT, then the same wash and sampling procedure repeated for 5 consecutive DAT (days after treatment). Halosulfuron recovery was 65% at 5 DAT. After 1 WO, 36, 20, 14, 11, and 6% was recovered at 1, 2, 3, 4, and 5 DAT. Paraquat recovery was 52, 31, 21, 14, and 9% at 1, 2, 3, 4, and 5 DAT for the RF study. In contrast, a single irrigation washed all paraquat from the LDPM. Glyphosate recovery was 80 and 50% at 1 and 5 DAT. Similar to paraquat, glyphosate recovery was <3% after 1 WO. Carfentrazone recovery was 10 to 40% at 1HAT to 4 DAT for both RF and WO studies indicating carfentrazone adsorption to LDPM, with subsequent release with each wash off event. After 1 WO event, 98% of oxyfluorfen remained on LDPM. Oxyfluorfen recovery for RF and WO studies linearly declined from 50 to 6% by 4 DAT indicating adsorption to the LDPM.