Data/hora: 23/09/2024 12:53:10

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	08/06/2004	
Data da última atualização: 	27/08/2018	
Autoria: 	CANELLAS, L. P.; FAÇANHA, A. R.	
Afiliação: 	Luciano Pasqualoto Canellas; Arnoldo Rocha Façanha, Universidade Estadual do Norte Fluminense Darcy Ribeiro/Centro de Ciências e Tecnologias Agropecuárias, Laboratório de Solos.	
Título: 	Chemical nature of soil humified fractions and their bioactivity.	
Ano de publicação: 	2004	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 3, p. 233-240, mar. 2004	
Idioma: 	Inglês	
Notas: 	Título em português: Natureza química do húmus do solo e sua bioatividade.	
Conteúdo: 	The aim of this work was to evaluate the humus composition from an Ultisol from Campos dos Goytacazes, RJ, Brazil. Soil samples of four depths (0-0.05, 0.05-0.10, 0.10-0.20 and 0.20-0.40 m) and its chemical nature were analysed by elemental composition, E4/E6 ratios and Fourier transformed infrared spectroscopy. The bioactivity of these humified substances was evaluated through their action on maize root growth and H+-ATPase activity of root´s microsomes. In topsoil, the content of high condensed alkaline soluble humic substances is greater than that found in the subsuperficial layers. The chemical nature of humic and fulvic acids also varied with the soil depth. The humic acids isolated from the soil samples exhibited higher bioactivity compared with the fulvic acids. Moreover, the results suggest that more condensed humic substances can promote highest stimulation of the microsomal H+-ATPases from maize roots. These data reinforce the concept that the activity of the H+ pumps can be used as a biochemical marker for evaluation of humic substances bioactivity.	
Palavras-Chave: 	ácidos fúlvicos; ácidos húmicos; H+-ATPase.	
Thesaurus Nal: 	fulvic acids; humic acids.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/108425/1/Chemical.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (26494-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS