Data/hora: 27/05/2024 16:38:42

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba; Embrapa Pantanal.
Data corrente: | 28/09/1995
Data da última atualização: | 24/11/1995
Autoria: | BROOKES, P. C.; POWLSON, D. S.; JENKINSON, D. S.
Afiliação: | rothansted Experimental Station.
Título: | Measurement of microbial biomass phosphorus in soil.
Ano de publicação: | 1982
Fonte/Imprenta: | Soil Biology Biochemistry, v.14, p.319-329, 1982.

Idioma:

Inglês
Português

Conteúdo: | A method for measuring the amount of P held in soil micro-organism (biomas P) is described and the assumptions on which it is based are discussed. Biomass P is calculated from the difference between the amount of inorganic P (Pi) extracted by 0.5 m NaHCO3 (pH 8.5) from fresh soil fumigated with CHCl3 and the amount extracted from unfumigated soil. Some CHCl3-released Pi is sorbed by soil during fumigation and axtraction: an approximate allowance for this is made by incorporating a known quantity of Pi during extraction and correcting for recovery. Most of the P released is in inorganic form and the proportion increases with duration of fumigation. Non-microbial P is little, if at all, affected by fumigation. Microbial biomass P is calculated from CHCl3-released Pi by dividing by 0.4, i.e. by assuming that 40% of the P in the biomass is rendered extractable as Pi by CHCl3. Measurements of biomass P must be done in fresh soil, CHCl3 releases much less P in air-dry soil.
Palavras-Chave: | Biomassa microbiana; Cloroformio; P-biomass; P-biomassa.
Thesagro: | Biomassa; Fósforo; Fumigação; Solo.
Thesaurus Nal: | biomass; chloroform; fumigation; microbial biomass; phosphorus; soil.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)

Exemplares:

CPAMN-UEPP - (4437-1) - EMB - SP - -- -  -  - 1995.00185 - DIS
CPAP - (29934-1) - ADD - SP - PP - SP14642 -  - 14642 - DIS