Answer:
Nitrogen cycling in nature is an important part of food chains and the functioning of different ecosystems. Nitrogen is a vital element in life and is present in all amino acids and proteins. In plants, much of the nitrogen is contained in the leafy green molecules, which are the key to connectivity.
78% of the air is nitrogen, but most organisms cannot directly utilize it. Some bacteria bind nitrogen (N2) with hydrogen to ammonia (NH3), others convert it to nitrite (NO2), others convert it to nitrate (NO3), which binds to amino acids and further to proteins. Animals get all their nitrogen by eating plants or herbivores or herbivores, depending on where they live in the food chain.
Animal secretions and dead organisms contain nitrogen compounds. Specialized bacteria break down these proteins and release nitrogen back into the atmosphere. In the nitrogen cycle, various bacteria play a major role.
There are few bacteria that make ammonia from nitrogen gas, and soils that make ammonia nitrites, or nitrifying bacteria, are so free that there is little free ammonia in the soil.
If there is enough oxygen in the sea bottom sediment, so does the sea. Deep areas of the Baltic Sea are depleted of oxygen and retain ammoniacal nitrogen, which can feed on algal blooms.
Mankind is actively influencing the nitrogen cycle by using nitrogen fertilizers in agriculture. Too much nitrogen compounds are bad because they eutrophicate waterways. In the Baltic Sea, it is estimated that human nitrogen fertilization and combustion processes have more than doubled the natural nitrogen cycle. Nitrous oxide N2O, which is released from man-made fertilizers, is the third most important human greenhouse gas after carbon dioxide and methane.
