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Abstract: Compost, the substrate on which mushroom grows, is the result of decomposition process governed by a number of microorganisms which produce important chemical reactions there by making it selective for Agaricus bisporus. The nutrients for mushroom growth are provided in compost which is traditionally prepared from horse manure and wheat straw. Satisfactory development of spawn in unfermented horse manure is prevented by self generation of heat and competition from other microorganisms. It is therefore necessary to compost the manure in order to produce a medium which will remain stable and in which quantity of readily available nutrients for competing microorganisms is considerably reduced. Due to scarcity of horse manure, efforts have been made by scientists to develop its alternative based on vegetable origin (Lambert, 1929; Edwards, 1950; Sinden and Hauser, 1953; Shandilya and Hayes, 1976; Shandilya, 1979; Tewari and Sohi, 1976 and Shandilya, 1986b).
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