The main cause of nitrogen fixation in the soil is bacteria. Specifically, certain types of bacteria, including those in the genera Rhizobium and Frankia, can convert atmospheric nitrogen (N₂) into a form that plants can use (such as ammonia). While lightning can also contribute to nitrogen fixation by converting atmospheric nitrogen into nitrates, the primary biological process happens through these nitrogen-fixing bacteria in the soil and in the root nodules of some plants.
Nitrogen can be "fixed" in the soil. What is the main cause of nitrogen fixation in the soil?
water cycle
bacteria
lightning
1 answer