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Abstract: The cultivation of Pleurotus species is gaining popularity because of its diverse ability of growth at a wide range of temperature (20°-35°C) and on various agricultural waste materials such as unfermented paddy straw (Bano and Srivastava, 1962; Agha, 1974; Kurtzman, 1975), chopped branches of Euphorbia royleana (Kaul and Jamardhan, 1970), chopped banana pseudostems (Jandaik and Kapoor, 1974) and saw dust (Yip Cho, 1980). These substrates have been successfully tried for cultivating different Pleurotus species but concerted efforts to commercialise its cultivation in India are yet to be made. Pleurotus florida, NRRL 3526, comparatively a high temperature requiring strain, was procured by the courtesy of Dr. R.H. Kurtzman. The main interest to attempt its cultivation under local environmental conditions of Punjab was to make the best use of abundantly available paddy straw (which is mostly burnt here by the farmers to clear off their fields) and to invent a cultivating technology which is economical and does not require elaborate heating and cooling arrangements. Also, the high temperature requiring nature was exploited to get a crop during that period of the year which is not suitable for cultivating other mushrooms (Agaricus bisporus and Volvariella volvacea/ V. displasia).
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