Data/hora: 13/06/2024 04:12:16

Provedor de dados: | 90
País: | Brazil
Título: | Nitrogen fractions in the microbial biomass in soils of southern Brazil
Autores: | Camargo,F. A.O.; Gianello,C.; Vidor,C.
Data: | 1999-03-01
Ano: | 1999
Palavras-chave: | Biomass-N; Biomass ninhydrin-reactive-N; Biomass ammonium-N; Biomass α-amino-N.
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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831999000100022
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06831999000100022
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.23 n.1 1999
Fonte: | info:eu-repo/semantics/openAccess