The Nitrogen Cycle

A small amount of nitrogen can be fixed when lightning provides the energy needed for N2 to react with oxygen, producing nitrogen oxide, NO, and

Nitrogen gas from the air is converted to nitrate compounds by nitrogen-fixing bacteria close nitrogen-fixing bacteriaThe bacteria found free-living in the soil

product life cycle Nitrogen cycles through both the abiotic and biotic parts of the Earth system The largest reservoir of nitrogen is found in the atmosphere, mostly as nitrogen

cell cycle Atmospheric nitrogen must undergo an important process called fixation to make it available for plants to use Nitrogen transforms through