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A recent study on rapeseed published in the March 2021 addition of Agronomy found that a, "...400-fold dilution of wood vinegar significantly increased plant height, total leaf number, green leaf number, leaf area, effective branch number, and pod number per plant. In particular, it significantly increased the leaf area index and accumulation of rapeseed dry matter.
Zhu, K.; Gu, S.; Liu, J.; Luo, T.; Khan, Z.; Zhang, K.; Hu, L. Wood Vinegar as a Complex Growth Regulator Promotes the Growth, Yield, and Quality of Rapeseed. Agronomy 2021, 11, 510. https://doi.org/10.3390/agronomy11030510