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United States Department of Agriculture

Agricultural Research Service

Title: Weed control efficacy with ammonium nonanoate for organic vegetable production

Authors
item Webber, Charles
item Shrefler, James - OSU, LANE, OK
item Brandenberger, Lynn - OSU, STILLWATER, OK
item Taylor, Merritt - OSU, LANE, OK
item Carrier, Lynda -
item Shannon, D - UNIV OF MISSOURI

Submitted to: International Journal of Vegetable Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 15, 2010
Publication Date: January 4, 2011
Citation: Webber III, C.L., Shrefler, J.W., Brandenberger, L.P., Taylor, M.J., Carrier, L.K., Shannon, D.K. 2010. Weed control efficacy with ammonium nonanoate for organic vegetable production. International Journal of Vegetable Science. 17:(1)37-44.

Interpretive Summary: Precision application of herbicides is important to vegetable conventional and organic producers because of the limited number of herbicides available and the potential for crop injury. Racer® (ammonium nonanoate) is a contact herbicide labeled for food use and is now labeled as a bio-herbicide for organically grown food crops. As a contact herbicide, precise chemical application will increase weed control efficacy while reducing crop injury. The objective of this study was to investigate weed control efficacy of Racer® applied at different rates and application volumes on weed populations. This research was conducted prior to labeling of Racer® as an organically approved herbicide. The factorial experiment included 2 herbicide rates (6.4 and 9.6 lb ai/a) applied at 4 application volumes (17.5, 35, 70, and 105 gpa). Racer® weed control was greater for broadleaf than grass weeds. The lowest Racer® rate provided unsatisfactory control for all weed species.

Technical Abstract: Precision application of herbicides is important to vegetable producers because of the limited number of herbicides available and the potential for crop injury. Racer® (ammonium nonanoate) is a contact herbicide labeled for food use and is now labeled as a bio-herbicide for organically grown food crops. As a contact herbicide, precise chemical application will increase weed control efficacy while reducing crop injury. The objective of this study was to investigate weed control efficacy of Racer® applied at different rates and application volumes on endemic weed populations. This research was conducted prior to labeling of Racer® as an organically approved herbicide. The factorial experiment included 2 herbicide rates (7.2, 10.8 kg ai ha**-1) applied at 4 application volumes (164, 327, 654, 981 L ha**-1). Racer® weed control was greater for broadleaf than grass weeds. The lowest Racer® rate provided unsatisfactory control for all weed species.

Last Modified: 11/22/2014
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