The main functions of acetobacter are:
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It fixes the atmospheric nitrogen.
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It also produces Riboflavin, Indole acetic acid and giberalin.
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When the seeds are treated with Azotobacter it improves germination.
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It can control the plant diseases as it produces some substances that can prevent the attack of the plant pathogens such as the Alternaria, Fusarium and Helminthosporium etc.
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It acts as a biological control agent.