(From TFA)... "Given the scale of farming today, treating weeds chemically is really the only practical way for humans to keep them under control"<p>That's not true. Cultivators have been used for a long time to keep weeds under control. Chemicals have simply become more convenient for many. This pdf explains a lot about cultivators and is a great read for anyone interested in the topic of weed control.<p><a href="http://www.sare.org/content/download/29730/413972/file/Steel%20in%20the%20Field.pdf" rel="nofollow">http://www.sare.org/content/download/29730/413972/file/Steel...</a>