Sora News: "Strange as it may sound, the technique has been a bit of folk wisdom for some time, and the Oita Prefectural Agriculture, Forestry, and Fisheries Research Guidance Center recently confirmed that hammer time really does help lead to mushroom time.
Last month, the organization conducted an experiment, comparing the effects of hitting a log with a hammer versus leaving it un-smacked, and found that the wood that had been hammered subsequently produced more than twice as much shiitake (by weight). "
https://soranews24.com/2022/02/08/violence-is-the-answer-japanese-farmers-using-hammers-to-grow-more-mushrooms/