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Abstract: Compost samples were analysed at filling, at spawning, at casing, before and after the first flush, after the second flush and at the end of cropping The following data were determined total ash, nitrogen, carbon, ether solubles, hot water solubles, lignin, nitrogen in the lignin, pentosan, alpha-cellulose and nitrogen in the alpha-cellulose. The results were exactly the same as in previous work (Mushroom Science VI). The lignin keeps constant during pasteurisation and the alpha-cellulose and pentosan decrease rapidly. The result of this investigation is that the major part of the lignin is consumed (63–92%) from spawning to the appearance of the first pinheads, whereas the alphacellulose and pentosan decreased slowly during spawn run but were more rapid when the fruit bodies were being formed. This leads to the very important conclusion that the nutrition of the cultivated mushroom during its vegetative period (spawn run) is quite different from that during fructification (cropping) when the fruit bodies are formed. Only the nutrition during mycelium growth on agar and in liquid culture have been studied in the past. Regression analysis showed highly significant relationships between yield and the amount of organic matter and water disappearing from the compost i.e. all water the fruit bodies need is taken up from the compost. Watering the casing soil only supplies the water lost by evaporation.
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