Chemical nature of soil humified fractions and their bioactivity.

dc.creatorCANELLAS, L.P.
dc.creatorFAÇANHA, A.R.
dc.date2014-09-17T07:33:38Z
dc.date2014-09-17T07:33:38Z
dc.date2004
dc.date2004-06-08
dc.date.accessioned2017-03-06T21:34:07Z
dc.date.available2017-03-06T21:34:07Z
dc.identifier26494
dc.identifierhttp://www.alice.cnptia.embrapa.br/handle/doc/110092
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/314519
dc.descriptionThe 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.
dc.description2004
dc.languageen
dc.publisherPesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 3, p. 233-240, mar. 2004.
dc.relationÁrea de Informação da Sede - Artigo em periódico indexado (ALICE)
dc.subjectfulvic acids
dc.subjecthumic acids
dc.subjectH+-ATPase
dc.subjectácidos húmicos
dc.subjectácidos fúlvicos
dc.titleChemical nature of soil humified fractions and their bioactivity.
dc.typeArtículos de revistas


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