The disadvantages associated with the supplementation of noncomposted nutrients to mushroom compost at spawning were largely overcome by encapsulating microdroplets of vegetable oil within a protein coat that was denatured with formaldehyde. Increases in mushroom yield of 60% were obtained. Delayed nutrient release was indicated by prolonged stimulation of yields beyond the first few flushes.
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Carroll et al. (1976) studied this question.