Data/hora: 23/09/2024 16:10:11

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	13/12/1995	
Data da última atualização: 	13/12/1995	
Autoria: 	WU, J.; O'DONNELL, A. G.; HE, Z. L; SYERS, J. K.	
Título: 	Fumigation-extraction method for the measurement of soil microbial biomass-S.	
Ano de publicação: 	1994	
Fonte/Imprenta: 	Soil Biology and Biochemistry, v.26, n.1, p.117-125, 1994.	
Idioma: 	Inglês	
Conteúdo: 	Fumigation-extraction was evaluated for the measurement of microbial biomass-S in soil. Following fumigation in CHCl3, S was extracted using 10 mM CaCl2 at a soil-to-extractant ratio of 1-to-2 (w/v). These conditions were shown to be favourable in a range of soils containing extractable-S below 30 mg S g-1 soil. Extractable-S was measured by ion chromatography following H2O2 digestion. The increase in extractable-S following fumigation (the flush) was converted to biomass-S using a conversion factor (Ks) determined using 35S-labelled biomass-S. Using a soil-to-extractant ratio of 1-to-2 gave a value for Ks of 0.31. This methodology was shown to be reliable for soils subject to arable, grassland or woodland management, with pH values above 3.7 and claycontents of 4-60%. The amounts of biomass-S measured in these soils were in the range 2.9-20 mg S g-1 soil. The data also showed that the amounts of biomass-S in soil are related to biomass-C and dependant upon soil management and fertilisation.	
Palavras-Chave: 	Biomassa microbiana; Cloroformio; Grassland; Sulphur.	
Thesagro: 	Enxofre; Fumigação; Pastagem.	
Thesaurus Nal: 	chloroform; fumigation; microbial biomass.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (4498-1) - ADP - SP - -- -  -  - 1995.00232 - DIS