nitrogen fixation


Also found in: Thesaurus, Medical, Legal, Financial, Encyclopedia, Wikipedia.

nitrogen fixation

n.
1. The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes.
2. The conversion by certain soil microorganisms, such as rhizobia, of atmospheric nitrogen into compounds that plants and other organisms can assimilate.

ni′tro·gen-fix′er (-fĭk′sər) n.
ni′tro·gen-fix′ing adj.

nitrogen fixation

n
1. (Biology) the conversion of atmospheric nitrogen into nitrogen compounds by certain bacteria, such as Rhizobium in the root nodules of legumes
2. (Chemistry) a process, such as the Haber process, in which atmospheric nitrogen is converted into a nitrogen compound, used esp for the manufacture of fertilizer
ˈnitrogen-ˌfixing adj

ni′trogen fixa`tion


n.
1. any process of combining atmospheric nitrogen with other elements, as used in the preparation of fertilizers and industrial products.
2. this process as performed by bacteria found in the nodules of leguminous plants, thereby making nitrogenous compounds available to the host plants.
[1890–95]

nitrogen fixation

The process by which free nitrogen from the air is combined with other elements to form organic compounds that plants can use as nutrients. Cyanobacteria and certain other forms of bacteria, especially those that live in the roots of legumes, convert gaseous nitrogen into organic compounds.

nitrogen fixation

The conversion of nitrogen gas to nitrates by some bacteria.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nitrogen fixation - the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacterianitrogen fixation - the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria
biological process, organic process - a process occurring in living organisms
References in periodicals archive ?
TERI participation: Development of transgenic rice plants capable of nitrogen fixation
This revealed the significance of legume in nitrogen fixation and its inclusion to cropping system.
Bio-fertilizers increase soil fertility through varied processes, such as phosphorus solubilizing, nitrogen fixation, and synthesis of growth-enhancing substances.
Major components of organic farming are crop rotation, maintenance and enhancement of soil fertility through biological nitrogen fixation, addition of organic manure and use of soil microorganisms, crop residues, biopesticide, biogas slurry, waste, etc.
Harrison has Haber (who versified in real life) further say: "After the mental struggle of nitrogen fixation I turn to verse as an effortless relaxation.
In Iran few studies have been done on biological nitrogen fixation but in recent years special attention has been paid to this matter.
This anthropogenic addition of nitrogen has reached a magnitude comparable to about half of global ocean nitrogen fixation (the natural process by which atmospheric nitrogen gas becomes a useful nutrient for organisms).
Nitrogen fixation by clover pastures can contribute significant amounts of N to a soil-pasture system, in the order of 55-342 kg N [ha.
3b), indicating that the ratio of nitrogen fixation rate to the rate of carbon incorporation into the cells remained constant in all conditions.
They serve as a suitable alternative to chemical fertilizers by adding nutrients through the natural processes of solubilizing phosphorus, nitrogen fixation, and stimulating plant growth through the synthesis of growth-promoters.
Acetylene-reduction assays, in which ethylene evolved from acetylene-incubated plants via symbiotic, bacterial N-fixers in nodules, has been used to estimate nitrogen fixation by N-fixing plants in ecological studies.
At Wileirog, the Jenkinses are aiming for 50-60% rye grass and 20-30% clover in their leys to achieve yield, pasture quality and nitrogen fixation.