SciELO - Scientific Electronic Library Online

vol.34 issue4Evaluation and spatialization of rainfall erosivity in the Rio Doce Valley, central-eastern region of Minas Gerais, BrazilAttributes of irrigated rice and soil solution as affected by salinity levels of the water layer author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657


LIMA, Claudivan Costa; MENDONCA, Eduardo de Sá  and  ROIG, Asunción. Contribution of humic substances from different composts to the synthesis of humin in a tropical soil. Rev. Bras. Ciênc. Solo [online]. 2010, vol.34, n.4, pp.1041-1048. ISSN 1806-9657.

The contribution of humic substances of different composts to the synthesis of humin in a tropical soil was evaluated. Increasing doses (0, 13, 26, 52, and 104 Mg ha-1) of five different composts consisting of agroinpowderrial residues were applied to a Red-Yellow Latosol. These composts were chemically characterized and 13C NMR determined and the quantity of the functional alkyl groups of humic acids applied to the soil as compost was estimated. Thirty days after application of the treatments, organic matter samples were collected for fractionation of humic acids (HA), fulvic acids (FA) and humin (HU), from which the ratios HA/FA and (HA + FA)/HU were calculated. The application of the composts based on castor cake resulted in the highest HU levels in the soil; alkyl groups of the HA fraction of the composts were predominant in the organic components added to the HU soil fraction.

Keywords : humic acids; fulvic acids; 13C NMR; alkyl groups; recalcitrance.

        · abstract in Portuguese     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License