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Warming Mushrooms to Promote Growth
Boswell Matsutake Studies Southwest Oregon


Mushroom growth has been suspect to be tied closely to warming and daily temperature variation. When temperatures are on the decline, and daily vary is less than 10 degree, mushrooms are slow to grow. To overcome natural temperatures, a device was invented to artificially warm mushrooms suspected of needing warmth to grow.

The photo on the below shows a patch of mushrooms fully formed, but not growing for several days. Continued cooling considered to be inhibiting growth.


 

Below is a device fashioned to heat water in a plastic Ziploc bag. 1/2 pint canning jar used as reservoir for kerosene, wick mounted in lid, copper tube run through tin can (flame heats tubing), and 2 plastic lines running to a bag of water. The device worked well as long as the heating tube was well below the plastic bag.

The bag was then placed over the mushrooms with the heat source below the bag. Heating was initiated during the night for two days to limit cooling.


Findings

No growth was noted for the two nights of heating. However, the attempt was complicated with a calamity of errors and poorly thought design.

The device for heating water did perform well when lit. The problem was keeping it going. Wind and rain extinguished the flame both nights. It is unknown length of heating period, before the flame was out. Warming at night was also a mistake. Variation in daily temperatures are a primary influence in growth. Warming during daytime would have increased daily variation.

Conclusions

 Artificially warming mushrooms to encourage growth may be possible. However, a larger area of warming will likely be needed.

 CAUTION: DO NOT ATTEMPT DURING DRY PERIODS. ACCIDENTS WOULD CAUSE LITTER LAYER TO IGNITE

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