02262naa a2200313 a 450000100080000000500110000800800410001910000200006024500970008026000090017752013600018665000210154665000260156765000200159365000170161365000100163065000210164065000090166165300250167065300210169565300360171665300220175265300260177470000150180070000210181570000190183670000200185577300730187520513172017-05-24       2016    bl uuuu     u00u1 u    #d1 aCUNHA, T. J. F.  aHumified fraction of organic matter due to plant mixture cultivation.h[electronic resource]  c2016  aThe aim of this study was to assess the organic matter changes in quantity and quality, particularly of the humic fraction in the surface layer (0?20 cm), of a Typic Plinthustalf soil under different management of plant mixtures used as green manure for mango (Mangifera indica L.) crops. The plant mixtures, which were seeded between rows of mango trees, were formed by two groups of leguminous and non -leguminous plants. Prior to sowing, seeds were combined in different proportions and compositions constituting the following treatments: 100% non-leguminous species (NL); 100% leguminous species (L); 75% L and 25% NL; 50% L and 50% NL; 25% L and 75% NL; and 100% spontaneous vegetation, considered a control. The plant mixtures that grew between rows of mango trees caused changes in the chemical composition of the soil organic matter, especially for the treatments 50% L and 50% NL and 25% L and 75% NL, which increased the content of humic substances in the soil organic matter. However, the treatment 25% L and 75% NL was best at minimising loss of total organic carbon from the soil. The humic acids studied have mostly aliphatic characteristics, showing large amounts of carboxylic and nitrogen groups and indicating that most of the organic carbon was formed by humic substances, with fulvic acid dominating among the alkali soluble fractions.  aHumic substances  aInfrared spectroscopy  aSoil management  aSoil quality  aManga  aMangifera Indica  aSolo  aAdubação orgânica  aCoquetel vegetal  aEspectroscopia de infravermelho  aQualidade do solo  aSubstâncias húmicas1 aGIONGO, V.1 aMENDES, A. M. S.1 aMARQUES, F. A.1 aCANELLAS, L. P.  tRevista Caatinga, Mossorógv. 29, n. 3, p. 578-586, jul./set. 2016.