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Abstract: The majority of commercial mushroom growers obtain beds of compost fully grown with mycelium, but their yields of mushrooms differ greatly. A few scattered results are known of 400 Kg. per ton of fresh manure. Such results are rare, but they exist. They show that the compost must contain food for many more mushrooms than are generally obtained. How can we get those additional mushrooms ? In this paper we will presume that the compost really contains all necessary elements and consider only the factors outside it, viz., casing soil and climate. In the laboratory at Houthem, Holland, we have studied casing soil since 1947. In our preliminary experiments we used two kinds: (1) Marl (finely ground limestone), which is in general use for mushroom cultivation in the caves of South Limburg and Belgium. (2) A mixture of loamy garden soil and peat (3 : 2 by volume), with a little marl to adjust the pH.
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