character: Azotobacter
topic: Role in Nitrogen Fixation
grade: 9
subject: Biology
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character: Nitrogen Cycle
topic: Importance of Nitrogen Fixation
grade: 9
subject: Biology
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character: Rhizobia
topic: Alternatives to Azotobacter in Nitrogen Fixation
grade: 9
subject: Biology
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character: Bacteria
topic: Microorganisms in Soil and Their Functions
grade: 9
subject: Biology
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