Konferenzpaper

Jahr der Veröffentlichung: 1996

Seiten: 83-93

Zeitschrift: Plant and Soil

Bandnummer: 181

Heftnummer: 1

ISSN: 0032-079X

DOI Link: https://doi.org/10.1007/BF00011295

Konferenz: 8th Nitrogen Workshop on Progress in Nitrogen Cycling Studies

Verlag: Springer

Abstract: 

Major known fractions of soil nitrogen are amino nitrogen (proteins, peptides), polymers of amino sugars, and NH4+ fixed in interlayers of 2:1 minerals. Only a small percentage of the total soil organic N is easily mineralizable and contributes to the pool of mineral soil N. Predominant sources of mineralization are amino-N and polymers of amino sugars present in the soil microbial biomass. Influx into this pool occurs with the application of organic matter (green manure, straw), organic carbon released by plant roots, N-2 assimilation by leguminous species and inorganic nitrogen. Microbial metabolization of green manure proteins results in a partial mineralization of the applied organic N, microbial metabolization of straw in the assimilation (immobilization) of inorganic nitrogen.

Microbial biomass is characterized by a narrow C/N ratio (proteins, peptidoglycans, polymers of amino sugars). Its metabolization therefore is associated with a partial mineralization of the attacked organic nitrogen compounds. Nitrogen mineralization consists of a sequence of enzymatic processes for which the living microbial biomass provides the enzymes and the dead microbial biomass the substrate.

Harvard-Zitierstil: Mengel, K. (1996) Turnover of organic nitrogen in soils and its availability to crops, Plant and Soil, 181(1), pp. 83-93. https://doi.org/10.1007/BF00011295

APA-Zitierstil: Mengel, K. (1996). Turnover of organic nitrogen in soils and its availability to crops. Plant and Soil. 181(1), 83-93. https://doi.org/10.1007/BF00011295