Abstract:
Salinity is the main limiting factor that inhibits the growth of rice plants significantly. N2-Fixing
Rhizobacteria halotolerant able to increase the growth of cave rice plants to support plant
productivity. This study was conducted to test PA and KP2 isolates to grow and increase Inpari
rice plant growth at salinity stress (0, 4, 8, and 12 dSm-1). This study used GT (Growth time)
with three replications to identify isolates growth ability on salinity stress as first stages. The
second stage was to determine isolates ability to improve rice seedling growth under salinity
stress using a randomized block design with twelve treatments and three replications. The result
showed that all isolate could grow and tolerate salinity stress up to 12 dSm-1 and growth faster
under salinity stress after 48 hours from inoculation. PA isolate grew 42.92 % while KP2 isolate
was 57.80 % faster at 12 dSm-1 compared to non-saline condition. The result also showed that
KP2 isolate give the best performance at 4 dSm-1 significantly increasing plant height 50.45%,
plant height 183.88% compare to without inoculation on the same level salinity. Therefore, that
ideal salinity for KP2 isolates to improve rice seedling growth under salinity stress was 4 dSm-1.
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