Effect of electrical stimulation on yield of Pholiota microspora in log cultivation was investigated experimentally. The pulsed voltage was generated by two types of high-voltage pulsed power generator, based on Cockcroft-Walton circuit and Marx generator in order to evaluate an influence of the applied voltage pulse width. The input energy was controlled by number of the pulsed voltage applying. The pulsed voltage was applied to the cultivation log before harvest of first flush. The fruit body yield was evaluated by total weight harvested during two harvest seasons. The experimental results showed that the fruit body yield increased to be 1.5-3.0 times higher by applying pulse voltage. The fruit body yield in the second season also increased by pulse voltage applying at former harvest season. This result indicates that the pulse high-voltage stimulation affect the yield at not only same harvest season but also next harvest season. The yield increment is mainly determined by input energy into cultivation log.
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