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A farmer adds Azotobacter culture to the...

A farmer adds Azotobacter culture to the soil before sowing maize. How does it increase the yield of maize ?

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Azotobacter is a non symbiotic nitrogen fixing bacterium. When the bacterial culture is added to the soil, it multiplies and helps in fixation of nitrogen thereby increasing the fertility of the soil. Thus the growth and productivity of the maize crop will increase.
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