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Abstract: The summer white button mushroom (Agaricus bitorquis) with little difference in its biology and temperature requirements for cropping from Agaricus bisporus, requires almost the same cultural practices for its cultivation as Agaricus bisporus. Bacterial inoculants either prepared as broth culmre or on some suitable carrier have not got significant importance in mushroom cultivation baring some reports in Agaricus bisporus, where their mixing in compost at spawning or inoculation in casing soil at casing have shown significant enhancement in mushroom yield. The present smdy was carried out with broth culture of Bacillus megaterium, Alcaligenes faecalis. Bacillus circulans-I, Bacillus circulans-II, Bacillus thuringiensis and commercial biofertilizer' Azotobacter', where the broth culmres were inoculated in casing at the time of casing, while the commercial biofertilizer' Azotobacter' was mixed in compost at spawning at 1.0%. The mixing of 'Azotobacter' at spawning did not show any significant effect on the yield of Agaricus bitorquis. However, the broth culture of Alcaligenes faecalis. Bacillus circulans-II and Bacillus thuringiensis resulted in significantly higher yield than the uninoculated treatment. There was no significant difference in the pinning initiation and first harvest time (days post casing) among different treatments. The higher yield in case of three broth culmre inoculation treatment in casing was largely due to more harvest during the first four weeks of the cropping cycle. The false truffle disease incidence also varied in different treatments and it was higher in Bacillus megaterium. Bacillus circulans-I and B. circulans-II inoculated treatments. However, up to 6th week of cropping the disease did not appear in control, 'Azotobacter' mixed, Alcaligenes faecalis and Bacillus thuringiensis inoculated treatments. The bacterial inoculation treatments also did not show any visible deleterious effect on the mushroom quality.
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