Gabe Brown does not use glyphosate because it is an antibiotic and a chelator.
Exactly. We try, if we use an herbicide, to choose those that have the shortest half-life and that can readily be consumed by biology. We don't use glyphosate because it's patented as an antibiotic and a chelator. Being an antibiotic it is very detrimental to soil biology. Also, from what I've learned, I believe that it's negatively affecting human health. I don't use atrazine as it, too, has many long-lasting negative ramifications. On our pastureland we have never used any herbicide. I have many crop fields that have not seen an herbicide for five years, so they could be certified organic if I wanted to, but why?
http://www.ecofarmingdaily.com/gabe-bro ... ewardship/
However, he still doesn't say which herbicide he uses.
More on chelation:
Glyphosate binds (chelates) vital nutrients such as iron, manganese, zinc, and boron in the soil, preventing plants from taking them up. This could also have implications for humans and animals that eat GM glyphosate-tolerant crops, as it could affect nutrient value.
Due to its strong metal chelating properties, glyphosate was initially used as a descaling agent to clean out calcium and other mineral deposits in pipes and boilers of residential and commercial hot water systems.
https://detoxproject.org/glyphosate/gly ... ing-agent/