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Nitrogen Cycle

Nitrogen Cycle. Nitrogen is the most common gas found in the earth's atmosphere . It is necessary for plant growth . In fact, it's necessary for the survival of all ecosystems! . Free nitrogen (single nitrogen atoms) are found in the following : Atmosphere animal wastes

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Nitrogen Cycle

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  1. Nitrogen Cycle

  2. Nitrogen is the most common gas found in the earth's atmosphere. • It is necessary for plantgrowth. • In fact, it's necessary for the survival of all ecosystems!

  3. Free nitrogen (single nitrogen atoms) are found in the following: • Atmosphere • animal wastes • dead and decaying

  4. Nitrogen Fixation: Only a few organisms can use nitrogen it just as it is. • These organisms "fix" the nitrogen for all other organisms to use. • They are called nitrogen fixing bacteria . • The bacteria are usually found in plant’s roots.

  5. The nitrogen-fixing bacteria found in the soils and in the roots of certain plants, change (or convert) free nitrogen into substances that other organisms can use by bonding it to other atoms.

  6. When the fixing process is finished, free nitrogen is converted into nitrates, nitrites, and ammonia. These substances can be used by plants. As the plants become food, the nitrogen can be used by animals.

  7. In another part of the cycle, animals eat plants containing usable nitrogen. That nitrogen returns to the soil as organic material(animal waste, decaying plants and animals) is decomposed by bacteria and other decomposers. • As in the first part of the cycle, denitrifying bacteria keep the nitrogen level in the soil balanced.

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