10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 1 2013 (January - March) A pot experiment was carried out during 2009 and 2010 to study the field performance of blue pine seedlings inoculated with selected species of bio-inoculants under nursery conditions .The experiment was laid in Completely Randomized Design with three replications which comprised of seven inoculants ( lessThan i greaterThan Azotobacter lessThan /i greaterThan sp., lessThan i greaterThan Azospirillum lessThan /i greaterThan sp., lessThan i greaterThan Pseudomonas fluorescens, Bacillus subtilis, Pisolithus tinctorius lessThan /i greaterThan , lessThan i greaterThan Laccaria laccata lessThan /i greaterThan and control). Various growth characters viz., shoot height, collar diameter, root length, and seedling survival at various intervals responded significantly to all the microbial inoculants. Among microbial inoculants the two mycorrhizae viz., lessThan i greaterThan Pisolithus tinctorius lessThan /i greaterThan and lessThan i greaterThan Laccaria laccata lessThan /i greaterThan proved beneficial for all growth parameters than rest of the inoculants. It was followed by lessThan i greaterThan Azotobacter lessThan /i greaterThan sp. lessThan i greaterThan , Azospirillum lessThan /i greaterThan sp., lessThan i greaterThan Pseudomonas fluorescens lessThan /i greaterThan and lessThan i greaterThan Bacillus subtilis lessThan /i greaterThan . However for root length lessThan i greaterThan Pseudomonas fluorescens lessThan /i greaterThan and lessThan i greaterThan Bacillus subtilis lessThan /i greaterThan gave best results than lessThan i greaterThan Azotobacter lessThan /i greaterThan sp. and lessThan i greaterThan Azospirillum lessThan /i greaterThan sp. Microbial inoculation of lessThan i greaterThan Pisolithus tinctorius lessThan /i greaterThan and lessThan i greaterThan Laccaria laccata lessThan /i greaterThan gave best results with respect to per cent decrease in seedling mortality rate of the species. Thus the two treatments viz; lessThan i greaterThan Pisolithus tinctorius lessThan /i greaterThan and lessThan i greaterThan Laccaria laccata lessThan /i greaterThan proved superior for all the studied growth parameters. Our findings show that the application of bio-inoculants improve the growth attributes of blue pine seedlings under natural field conditions. MALIK ASIF , SHAZIA LONE , FAYAZ A. LONE AND AFLAQ HAMID Blue pine, inoculation, seedlings, nursery 632-640