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Abstract: In previous experiments the supplement called 'Normal + 75%' produced a much higher yield than when either no inorganic supplement was added to the compost or only the usual amount of 15 kg gypsum per ton. Starting from this 'Normal + 75%' plus 50 kg 'Dangallus' per ton of horse manure compost, the effect of each single one of the four inorganic supplements (or combinations of two of these) was tested more in detail. The '16-day inactive composting process' was applied. Increasing amounts of (NH4)2SO4 markedly delayed decomposition in the pile. Extremely high amounts (28 kg/ton) almost completely stopped fermentation, resulting in a low yield. But adding 14 kg per ton of fresh manure greatly increased yield. Increasing amounts of CaCO3 showed a slight tendency towards slackening decomposition but did not seriously reduce yield. Adding up to 52 kg increased the yield. The results led to the assumption that a certain combination of (NH4)2SO4 and CaCO3 (added at stacking and at the first turn, respectively) would lead to higher productivity. The combination 12 kg (NH4)2SO4 and 35 kg CaCO3 gave the highest yields. This combination is now used as a standard treatment at the Danish Mushroom Research Station; it is termed 'Normal + 75% Formula A'. By adding increasing amounts of superphosphate, omitting gypsum, a tendency towards a higher yield was observed. Gypsum showed, as a rule, no effect at all, contrary to general experience up till now.
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