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A farmer adds Azotobacter culture to soi...

A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element will be replenished by doing so?

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Azotobacter is a free living bacteria in the soil . It helps some cereal crops like maize (Zea mays) in nitrogen fixation. The farmer adds Azotobacter culture to the maize field for enhancing the nitrogen element in the soil by the process of biological nitrogen-fixation.
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