Lightning really does make mushrooms multiply

Japanese farming folklore has it that lightning makes mushrooms multiply, and new research supports the idea. Mushrooms form a staple part of the diet in Japan, and the fungi are in such high demand that around 50,000 tons are imported annually, so scientists have been experimenting with artificial lightning to see if it could increase the crop.

A four-year study carried out at Iwate University in northern Japan on ten species of mushroom (so far) has shown that for eight of the 10 mushroom species a bolt of lightning-strength electricity could double the crop yield. The best improvements were found in the popular nameko and shiitake mushrooms. The experiments were carried out by seeding logs with mushroom spores and then applying high-voltage electricity pulses to the logs.

more here.

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