| Registro completo |
| Provedor de dados: |
Rev. Bras. Ciênc. Solo
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| País: |
Brazil
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| Título: |
Nitrogen fractions in the microbial biomass in soils of southern Brazil
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| Autores: |
Camargo,F. A.O.
Gianello,C.
Vidor,C.
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| Data: |
1999-03-01
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| Ano: |
1999
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| Palavras-chave: |
Biomass-N
Biomass ninhydrin-reactive-N
Biomass ammonium-N
Biomass α-amino-N
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| Resumo: |
The reaction of nitrogen compounds with ninhydrin can be used as an indicator of cytoplasmic materials released from microbial cells killed by fumigation. Total-N, ninhydrin-reactive-N (NR-N), ammonium-N (A-N), and α-amino-N in the microbial biomass of soils from the State of Rio Grande do Sul, Brazil, were determined, in 1996, in 0.5 mol L-1 K2SO4 extracts of fumigated and non-fumigated soils. Total-N varied from 20.3 to 104.4 mg kg-1 and the ninhydrin-reactive-N corresponded, in average, to 27% of this. The ninhydrin-reactive-N was made up of 67% ammonium-N and 33% aminoacids with the amino group at the α-carbon position. It was concluded that colorimetric analysis of NR-N and A-N may be used as a direct measure of microbial N in soil. This simple and rapid procedure is adequate for routine analyses.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831999000100022
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| Editor: |
Sociedade Brasileira de Ciência do Solo
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| Relação: |
10.1590/S0100-06831999000100022
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Ciência do Solo v.23 n.1 1999
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| Direitos: |
info:eu-repo/semantics/openAccess
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