This was posted by Kelly on another list.
Organic Farming appears to be the big opportunity and there’s a long list of Claimed Uses for Wood Vinegar
Following are a few links to articles that you may find of interest.
History and Use of Wood Pyrolysis Liquids as Biocide and Plant Protection Product
Effect of wood vinegar on soil properties and plant growth
The Use of Wood Vinegar In Reducing The Dependence On Agro-Chemicals
Effects of wood vinegar on the soil microbial characteristics