The most suitable culture material for the mycelial growth stage of Pleurotus ostreatus has a water content of 60% to 65%, that is, the material to water ratio is 1:1.2 to 1.4. The judgment method:

(1) Various culture materials must be exposed to the sun for 2 to 3 days before mixing to make the culture materials fully dry.

(2) For culture materials with larger particles such as corn cobs and crushed crop straws, the water content can be controlled at about 65%, and the material-to-water ratio is 1:1.4, that is, grab a handful and mix it with your hands. Hold the culture material tightly until water droplets form between your fingers, but do not drip.

(3) The moisture content of sawdust, rice husk powder, peanut shell powder, cotton stalk powder and other culture materials with smaller particles can be controlled at about 60%, and the material-water ratio is 1:1.2, that is, by hand Grab a small handful of the mixed culture material and hold it tightly. There should be water between your fingers, but it should not form water droplets.

(4) Using fermented material for sowing cultivation, the material-to-water ratio of the culture material can be increased to 1:1.6; using the raw material direct seeding method for cultivation, the material-to-water ratio of the culture material can be controlled at 1:1.2~1.4 .

(5) During low-temperature cultivation, the water content of the culture material can be increased by 2% to 3%; during high temperature, the water content of the culture material can be reduced by 2% to 3%.

The above method is also suitable for determining and testing the moisture content of edible fungi culture materials such as phoenix tail mushrooms, copri mushrooms, and yellow mushrooms.