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Nitrogen cycle


The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into various chemical forms as it circulates among the atmosphere and terrestrial and marine ecosystems. The conversion ...

The Nitrogen Cycle - Boundless


The nitrogen cycle is the process by which nitrogen is converted from ... Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as ... to use atmospheric nitrogen (N2), it must be "fixed" or converted into ammonia (NH3). ... This is important because plants can assimilate nitrate into their tissues, and ...

The process of converting nitrogen into a form plants can use is ...


The process is called nitrogen fixation.

What converts nitrogen from the air into a form plants can use ...


Soil converts nitrogen into a form plants can use. Nitrates in soil and water are converted to nitrogen by bacteria, fixed by lightning and released into the air ...

The Nitrogen Cycle - Kimball's Biology Pages


But most organisms cannot use nitrogen in this form. Plants must secure ... Three processes are responsible for most of the nitrogen fixation in the biosphere: atmospheric ... Ammonia can be taken up directly by plants — usually through their roots. However, most of the ammonia produced by decay is converted into nitrates.

Nitrogen - Soil Management - University of Hawaii


Denitrification: Conversion of nitrate to atmospheric forms of nitrogen ... Organic nitrogen must be converted to ammonium before it is used by plants. ... In the soil, nitrogen fixating organisms can form special relationships with plants, called ... is necessary to convert N2 gas into ammonium through this biological process.

Nitrogen Cycle - Environmental Decision Making, Science, and ...


Seventy-nine percent of the atmosphere is nitrogen in the form of N2 gas. ... This process of conversion is called nitrogen fixation, and makes the nitrogen ... Plants can not use N2, and the N2 can therefore escape into the atmosphere. Farmers ...

Nitrogen Cycle - Backyard Nature


The problem is that green plants can't use the nitrogen that's free in the atmosphere. ... The process of chemically altering unusable, free atmospheric nitrogen into a form usable by organisms is referred to as nitrogen fixation. ... The process of converting ammonia to nitrate, called nitrification, is usually accomplished by...

Forms of Nitrogen in the Soil - Plant and Soil Sciences eLibrary


Plants normally use nitrogen in only the ammonium and nitrate forms. ... Bacteria can convert nitrogen to organic forms through fixation. ... Moisture and oxygen are necessary for microbial function in both the mineralization and nitrification processes. .... When a plant residue with a wide C:N ratio is incorporated into the soil, ...

Nitrogen Fixation - Tree of Life Web Project


The process of biological nitrogen fixation was discovered by the Dutch ... Plants cannot fix nitrogen on their own, but need it in one form or another to make ... The fixation of nitrogen, in which the gaseous form dinitrogen, N2) is converted into forms ... it to an inorganic form (usually ammonium, NH4<sup>+</sup>) that plants can use.

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The nitrogen cycle | Sciencelearn Hub


Jul 30, 2013 ... As a gas, however, nitrogen can't be used by most living things. ... It has to be converted or 'fixed' to a more usable form through a process called fixation. ... Through lightning: Lightning converts atmospheric nitrogen into ammonia and nitrate ... Animals obtain these compounds when they eat the plants.



These organisms convert nitrogen in the soil to ammonia, which can then be taken up ... After nitrogen has been fixed, other bacteria convert it into nitrate, in a process ... Plants cannot use the nitrogen in our atmosphere without the assistance of ... form of nitrates while animals assimilate their nitrogen by eating the plants.

Nitrogen cycle - Lenntech


Nitrogen in the gaseous form cannot be absorbed and used as a nutrient by plants and ... Plants can use ammonia as a nitrogen source. ... anaerobic bacteria will convert them back into nitrogen gas, during a process called denitrification.