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The aim of this study was to survey and evaluate some plant beneficial functions of fifteen indigenous microorganism communities (IMOC) collected from different cropping systems within Soc Trang province such as nitrogen fixation, phosphate solubilization, IAA synthesis and antagonistic efficacy. Nitrogen fixation, phosphate solubility and IAA synthesis capacity of IMOs were determined by nitroprusside, molybdate and Salkowski reagent method, respectively.
Fusarium oxysporum and Rhizoctonia solani were acted as plant pathogenic fungi and used to investigate antagonistic capacity of 15 IMOCs against these two pathogenic fungi under the laboratory condition. The results showed that all 15 surveyed IMOCs were able to fix biologically nitrogen from the air, to solubilize phosphate and to synthesize IAA with an extent varied between0.11 and 6.41 mg/L NH+ 4 ., between 347 and 2011 mg/L P2O5 and between 9.23 and 56.58 mg/L IAA, respectively. In addition, all 15 surveyed IMOCs were found to have a very high potential in bio-control against two model plant pathogenic fungi, with an extent of antagonistic efficacy ranged from 34.63% to 85.46% for F. oxysporum and from 52.96% to 92.59% for R. solani. In conclusion, the finding results of this study imposed that all 15 surveyed IMOCs possessed many plant beneficial functions and thus they can be exploited for plants as one of microbial fertilizer sources.
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