Скачать или смотреть How soil Produces Nitrogen Gas !!

When a plant or animal dies, or an animal expels waste, organic nitrogen become accumulated inside the soil. Bacteria or fungi inside the soil, convert this organic nitrogen into ammonium, a process called ammonification. Next, the soil living bacteria and other nitrifying bacteria, converts ammonium into nitrate. Other bacterial species, such as Nitrobacter, are responsible, for the oxidation of the nitrites into nitrates. It is important for the ammonia to be converted to nitrates or nitrites. because ammonia gas is toxic to plants. Finally, some bacterial species, such as Pseudomonas, and Clostridium, reduces the nitrates into nitrogen gas in anaerobic conditions. And this nitrogen gas is finally released to the atmosphere.