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Peat Substrates for Mushrooms: Casing Soil Specifications Buyers Should Ask For

Peat substrates for mushrooms are specified differently from horticultural growing media, because the casing layer is a water reservoir and a fruiting trigger rather than a root zone. A mushroom farm buying casing peat should confirm the peat type, the fraction, the pH reference point before and after liming, moisture and bulk density at delivery, structural stability after wetting and ruffling, batch-to-batch consistency, and a packaging format that matches the farm intake. ASB Professional supplies black peat in 0-5 mm and 0-10 mm fractions from its production in Estonia, either already adjusted to pH 7 and ready for casing use or as raw material at its natural pH for farms that lime it themselves, in 200 L, 250 L and 4500 L formats, plus white peat fractions for farms and blenders that build their own casing recipe.