General Discussion
In reply to the discussion: Organic farms yield less produce, require more land: study [View all]nobodyspecial
(2,286 posts)or any other one that backs up your contention that organic farms use herbicides. If they do use anything other than the ones I have outlined it is NOT an organic farm.
Organic Herbicides and Bioherbicides
A limited number of products have been developed that organic growers can spray for weed control. Natural-product herbicides allowed for organic production, including acetic acid (concentrated vinegar), essential oils, and natural allelochemicals, are nonselective contact herbicides most useful for spot treatments of, for example, a localized infestation by a new weed species, or poison ivy on fencerows or near a farm stand. The Organic Materials Review Institute lists products that are allowed and those not allowed for use on organic farms, including herbicide products. A few bioherbicides based on specific fungal pathogens have been developed against specific weed species that have become especially problematic in particular regions. At this time, however, organic herbicides and bioherbicides play a minor role in the organic weed control toolbox. See the related article Can I Use This Input On My Organic Farm? for further information.
http://www.extension.org/pages/18532/an-organic-weed-control-toolbox
Find me one thing that backs up your contention other than this vague something I read one time... Like I said, they may have used the term herbicide, but it would have had to have meant a natural one.