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Please use this identifier to cite or link to this item:
http://krishi.icar.gov.in/jspui/handle/123456789/32699
Full metadata record
DC Field | Value | Language |
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dc.contributor.author | ICAR_CRIDA | en_US |
dc.date.accessioned | 2020-02-25T06:58:50Z | - |
dc.date.available | 2020-02-25T06:58:50Z | - |
dc.date.issued | 2007-01-01 | - |
dc.identifier.citation | Not Available | en_US |
dc.identifier.issn | Not Available | - |
dc.identifier.uri | http://krishi.icar.gov.in/jspui/handle/123456789/32699 | - |
dc.description | Not Available | en_US |
dc.description.abstract | Plants have two main natural sources of combined nitrogen, nitrate and ammonium ions. In addition, many have access to urea, from either animals or fertilizer. Although it can be absorbed and metabolised by plants, in many soils urea is hydrolysed by the enzyme urease to ammonia and carbon dioxide. Urease is one of a number of enzymes found in a more or less free state in soil, following secretion by, or death of the organisms which produced them (Nannipieri et ai. 1982, Nor 1982). Nitrate, ammonium and urea form essential parts of the familiar nitrogen cycle, as does the reduction of nitrogen gas (N2' now often called dinitrogen) to ammonia. This latter process is carried out by an enzyme complex called nitrogenase which occurs only in certain prokaryotic organisms ('primitive' organisms lacking many of the components of cells of more advanced organisms (eukaryotes), i.e. plants, animals and fungi). Many of these nitrogen fixing prokaryotes associate more or less closely with eukaryotic organisms. The biology of the various systems has been described in recent books by Sprent (1979) and Postgate (1982). We shall be considering some examples of significance to arid zones in the next section. The main stages from the reduction of nitrogen gas to the incorporation of reduced nitrogen into protein are summarised in Fig. 16.1, p. 216 (note that in cells, ammonia is protonated to ammonium which is the form which predominates in cell physiological reactions). For comparison, nitrate reduction and urea hydrolysis are also included. Ammonium assimilation can be seen to offer the simplest route. Additional comparisons amongst these sources of nitrogen will be made in later sections. Further details may be obtained from Postgate (1982) and Sprent (1984a). | en_US |
dc.description.sponsorship | Not Available | en_US |
dc.language.iso | English | en_US |
dc.publisher | ICAR_CRIDA | en_US |
dc.relation.ispartofseries | Not Available; | - |
dc.subject | Nitrogen,arid,semi-arid,agriculture | en_US |
dc.title | Nitrogen fixation in arid and semi-arid agriculture | en_US |
dc.title.alternative | Nitrogen fixation in arid and semi-arid agriculture | en_US |
dc.type | Book | en_US |
dc.publication.projectcode | Not Available | en_US |
dc.publication.journalname | Not Available | en_US |
dc.publication.volumeno | Not Available | en_US |
dc.publication.pagenumber | Not Available | en_US |
dc.publication.divisionUnit | Not Available | en_US |
dc.publication.sourceUrl | Not Available | en_US |
dc.publication.authorAffiliation | ICAR_CRIDA | en_US |
dc.ICARdataUseLicence | http://krishi.icar.gov.in/PDF/ICAR_Data_Use_Licence.pdf | en_US |
Appears in Collections: | NRM-CRIDA-Publication |
Files in This Item:
File | Description | Size | Format | |
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Nitrogen fixation in arid and semi-arid agriculture.pdf | 241.45 kB | Adobe PDF | View/Open |
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