Nitrogen Cycle

• Nitrogen Fixation is when bacteria converts N2 (nitrogen) into NH3 (ammonia).
• Nitrogen Fixation is done by bacteria like, cyanobacteria and rhizobium.
• Nitrification is when ammonia in soil is converted to nitrite, then nitrate, which is completed by aerobic bacteria.
• Nitrogen Uptake/Absorbtion: plant roots absorb inorganic nitrogen ions.
• Animals get nitrogen by eating plants or other plant-eating animals.
• Ammonification: when nitrogen is in living things, it leaves as waste or death and returns back to ammonia.
• Denitrification is when nitrate returns back to nitrogen by bacteria.
• Humans can affect the nitrogen cycle by using commercial inorganic fertilizer which causes dead zones.
• Humans can affect the nitrogen cycle by adding NO to the air through combustion of fuels. When it enters the water cycle, it causes acid rain.
• Combustion of nitrogen causes acid rain.
• Humans can affect the nitrogen cycle by removing nitrogen from the crust by mining.
• Humans can affect the nitrogen cycle by removing nitrogen from soil, like harvesting crops, irrigation and deforestation.
• Humans can affect the nitrogen cycle by adding nitrogen to aquatic systems from runoff.