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metadata.artigo.dc.title: Hydrophysical properties of humic latosols from Brazil
metadata.artigo.dc.creator: Ajayi, A. E.
Dias Junior, M. S.
Curi, N.
Pais, Paula Sant Anna Moreira
Iori, Piero
metadata.artigo.dc.subject: Humic latosols
Organic matter
Precompression stress
Hydrophysical properties
metadata.artigo.dc.publisher: Institute of Agrophysics, Polish Academy of Science International Agrophysics 2014
metadata.artigo.dc.identifier.citation: AJAYI, A. E. et al. Hydrophysical properties of humic latosols from Brazil.International Agrophysics, [S.l.], v. 28, n. 4, p. 395-402, 2014. DOI: 10.2478/intag-2014-0030.
metadata.artigo.dc.description.abstract: The hydrophysical properties of the prevalent Humic Latosols (organic matter rich and charcoal stained soils) were related to structural sustainability under loading. Intact cores collected at the Ap, AB, Bw horizons were used for hydrophysical characterization. Precompression stresses at 10 suctions were obtained to estimate the load bearing capacities. We observed the dominance of kaolinite with some occurrences of gibbsite and hydroxy-interlayered vermiculite in the clay mineralogy. The high organic matter content in the Ap horizon favours crumb structure with the structural unit presenting high porosity and water retention. The structure of the AB and Bw horizons was, however, granular with structural units having low porosity. Possible influence of earlier incidences of fire enhanced the organic matter and carbon content in the soil reducing down the profile from 42.5 g kg-1 at the Ap to 16.4 g kg-1 at the Bw horizon. The C/N ratio increased from 14 at the Ap to 17 at the Bw, and air capacity increased from 18.1% at Ap to 32.0% at Bw. Precompression stress values were: 100.6±40.7 kPa at Ap, 117.4±44.6 kPa at AB, and 116.1±58.9 kPa at Bw. Load bearing capacities at the AB and Bw horizons were homogenous.
metadata.artigo.dc.language: en_US
Appears in Collections:DCS - Artigos publicados em periódicos

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