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Hydrated lime (calcium hydroxide, Ca(OH)), low in magnesium.
Hydrated lime (calcium hydroxide) is used in mushroom cultivation for a cheap, low-tech method called cold water pasteurization, primarily for substrates like straw, by creating a high-pH (around 12) solution to kill contaminants without heat, allowing oyster mushrooms and others to thrive on the enriched, pasteurized material. Key points: use only hydrated lime (not garden lime), soak substrate for 12-24 hours, drain well, and always wear gloves due to its caustic nature.
How it works (Cold Water Lime Pasteurization)
· Kills Contaminants: The highly alkaline (basic) solution disrupts the cell walls of bacteria and mold spores on the substrate.
· Enriches Substrate: Provides calcium, an essential nutrient, and helps structure the material.
· Low-Tech & Safe: An effective alternative to heat pasteurization (like pressure cooking) for straw and other materials, making mushroom growing accessible.
Key Steps & Tips
Ratio: About 2-3 grams of lime per liter of water (or ~300g for a 55-gallon drum).
Soak: Submerge chopped straw or other substrate for 12-24 hours in the cold lime-water mix.
Drain: Drain thoroughly (4-12 hours) on a screen or perforated surface before inoculating with mushroom spawn.
Safety: Wear gloves and eye protection; hydrated lime is irritating.
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