2021-06-02
Injecting or soaking shiitake bags for pinning can leave substrate too wet, requiring prolonged film cutting and pin care. Delayed fruiting can miss the premium mushroom season. The following rapid-pinning method is described.
Targeted perforation:Drive four 8–10 cm nails fully through a 1.5 cm-thick, 45 cm-long board of a convenient grip width. Use it to make two rows of eight holes on each inoculated face of a log.
Upright bag placement:Stand the perforated substrate logs upright in a tank or barrel, no more than two layers deep. Restrain them with a bamboo or wooden grid and weights to prevent floating.
Preparing a measured solution:Use a measured bucket or tank to prepare the urea solution specified in the original article as 0.3%%. Fill the tank to cover the logs by 5–10 cm and maintain the level for one hour.
Timed bag soaking:Soak logs for 1.5–3 hours: 1.5–2 hours for the main flush and 2–3 hours from the second flush onward. Check moisture after 1.5 hours; the stated targets are 65–70% around the holes and 45–60% elsewhere, leaving unevenly distributed moisture.
Temperature-difference pinning:Soak logs for pinning on sunny days with day–night temperatures of 8–20°C, including nights below 12°C; medium-temperature strains need 14–16°C cooling. Perforate one end for drainage, stand that end downward on a sunny, sheltered, drained site, cover tightly with film and place a thermometer above the logs.
Temperature management for pinning:After perforation, soaking and temperature treatment, leave the logs in place under tightly secured plastic film. At 18–24°C, large numbers of primordia may appear within 2–3 days.
Precautions
1. Logs treated by this method should have 35–55% moisture. Below 35%, add a little water in advance and allow recovery; above 55%, shorten or omit soaking. The source prints these percentages with doubled percent symbols.
2. During temperature-difference pinning, check every 30 minutes and cool immediately if the temperature exceeds 35°C.
Hubei Changyin Edible Fungi Machinery Co., Ltd. supplies bag filling machines, clipping machines, dryers and other mushroom equipment to customers across China, supported by after-sales service.