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Abstract: Compost before and during spawn run and cropping was extracted and the auto claved extracts used as a nutrient medium for growth of mushroom mycelium. The nutrient status of the comport changed as the mycelium grew through it and this was reflected by the metabolic physiology of the mycelium, including changes in protein content, distribution of free amino acids, and activity of phenoloxydases. Composts which differed in their yield capacity also differed in the metabolic patterns produced in mycelium grown in their extracts. Results obtained so far suggest that some of these differences in pattern, e.g. in phenoloxidase activity, are directly related to yield capacity. At least one unknown substance characteristically found in mushroom tissue was also present in extracts of fresh compost.
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