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One of the problems for the sustainability of agriculture systems is the excessive use of inorganic fertilizers. This affects the conditions of soil biology, soil chemistry, and irrigation water. Solution for supporting the sustainability of the agriculture system is the application of organic agriculture. Organic agriculture is supported by the existence of plant growth promoting rhizobacteria. This research aimed to identifying isolates of plant growth promoting rhizobacteria, analyzing the conditions of paddy field soil chemistry and irrigation water. Samples were taken by random sampling. Bacterial identification was performed by dilution, planting on the media, quadrant digging, morphology test, gram staining, and DNA sequencing. The results showed that organic agriculture obtained Pseudomonas, Pantoea, Stenotrophomonas, Serratia, Exiguobacterium, Acinetobacter, and Bacillus. Inorganic agriculture obtained Pseudomonas and Bacillus. Comparison of soil chemistry quality in agriculture systems of organic: inorganic are showing organic C (1.9 %:1.4 %), N (0.37 %:0.24 %), P (11.64 ppm:10.81 ppm), K (0.28 %:0.23 %), and pH (6.58:6.26). Comparison of irrigation water quality in agriculture systems of organic: inorganic are showing DO (7.6 ppm:6.4 ppm), COD (49 ppm:26 ppm), BOD (8.8 ppm:2.1 ppm), TSS (25 ppm:48 ppm), Pb metals (< 0.0161 ppm:<0.0161 ppm), and Cr-VI metals (<0.0014 ppm:<0.0014 ppm).

Sustainability of Organic Agriculture System by Plant Growth Promoting Rhizobacteria (PGPR)