The objective of this study was to evaluate efficacy of the nitrogen fixer, Burkholderia sp. PL9 and IAA synthesizer, Acinetobacter sp. GH1-1, respectively, isolated from rice cultivated salt affected soils in the shrimp -rice farming system in Soc Trang province on growth and yield of rice cultivar LP5 on salt affected soil of shrimp -rice farming system in My Xuyen district, Soc Trang province. The field experiment was designed as a randomized complete block design with 4 replications and ten

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... treatments. Some parameters including growth, yield components and yield were collected. The results showed that two treatments applied with 50% recommended N (full PK) together with an inoculation of either Burkholderia sp. PL9 or Acinetobacter Sp. GH1-1 had the same plant height, panicle length at the harvesting time (no application for Acinetobacter sp. GH1-1) as the recommended NPK fertilizer treatment without inoculation of bacteria did. Moreover, these two treatments also had a similar panicle numbers/m 2 for Acinetobacter sp. GH1-1 and had even higher one for Burkholderia sp. PL9 as compared to the recommended NPK fertilizer treatment without inoculation of bacteria. The rice yield of these two treatments was similar and not significantly different from that of the recommended NPK fertilizer treatment without inoculation. In short, the results showed that both nitrogen fixer, Burkholderia sp. PL9 and IAA plant hormone synthesizer, Acinetobacter sp. GH1-1 had a capacity to provide up to 50% recommended inorganic N fertilizer for rice when grown on salt affected soil.