PLANT GROWTH PROMOTING RHIZOBACTERIA AFFECT BUTTON MUSHROOM YIELD AND QUALITY

Microorganisms in mushroom casing play a crucial role in initiation and development of primordia and uniform distribution of sporophores, higher mushroom yield, and early cropping. We investigated the effects of plant growth promoting rhizobacteria (PGPR) on yield and quality of button mushroom (Agaricus bisporus Sing) by inoculating in casing and substrate. In the first experiment the casing was inoculated with suspensions of the PGPR Bradyrhizobium japonicum, Rhizobium leguminosarum, and Pseudomonas putida and compared to a noninoculation control. In the second experiment the best PGPR from the first experiment was inoculated in the substrate, casing and both substrate and casing. In the first experiment, the highest mushroom nitrogen and protein contents were 17.5 % and 1.73 % of the control, respectively with P. putida inoculation. In the second experiment, yield, weight of mushroom per tray and biological efficiency were higher 12.1% and 20.64 %, 12.1% and 20.64 %, and 13.43% and 21.08% of the control, respectively when substrate or both substrate and casing were inoculated with P. putida.

Agaricus bisporus, Bradyrhizobium japonicum, Pseudomonas putida, Rhizobium leguminosarum