The non-water component consists of wood tars, both water soluble and insoluble, acetic acid, methanol, acetone and other complex chemicals in small amounts. If left to stand, the pyroligneous acid separates into two layers comprising the water insoluble tar and a watery layer containing the remaining chemicals.
Specific Farm Uses for Wood Vinegar
The Appropriate Technology Association of Thailand recommends the following wood vinegar/water solution rates for various farm uses:
• Repel nematodes – Tomatoes, 1:500 (apply to the base of plants); strawberries, 1:200 (apply to the base of plants); and black pepper vines,
1:1500 (apply in place of water).
• Repel insect pests – Cabbage and Chinese cabbage, 1:1500 (apply in place of water); corn 1:300 (spray onto leaves).
• Control of fungal diseases – Tomato and cucumber, 1:200 (spray onto leaves).
• Control of root rot – Tomato and cucumber, 1:200 (apply to the base of plants).
• Reduce incidence of chili pepper flowers aborting – 1:300 (spray onto leaves).
• Improve flavor of sweet fruits and stimulate development of crops. Mix solution rates of 1:500 to 1:1000. Wood vinegar prevents excessive
nitrogen levels, improves plant metabolism and contributes to higher fruit sugar levels.
• Stimulate compost production. A solution rate of 1:100 will help increase the biological activity of various beneficial microbes and can
decrease composting times.
• Combat bad odor. A wood vinegar solution of 1:50 will diminish the production of odor-causing ammonia in animal pens.
• Supplement for livestock feed. Mixed with livestock feed at rates of between 1:200 and 1:300, wood vinegar can adjust bacterial levels in
the animal digestive tract which improve the absorption of nutrients from feed.
• Enrich garden soil. Use a strong solution of 1:30 to apply to the garden soil surface at a rate of 6 liters of solution per 1m² to enrich the soil
prior to planting crops. To control soil-based plant pathogens, use an even stronger rate of application.