Question

A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element is being replenished?

Answer 1

Azotobacter:

Azotobacter is a free-living nitrogen-fixing bacteria that can convert atmospheric nitrogen to ammonia which can be used by plants.

Importance of nitrogen fixation:

Nitrogen fixation by organisms like Azotobacter makes the soil rich in nitrogenous compounds, therefore acting as a biofertilizer.

Final answer:

Nitrogen