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| Dieckow,Jeferson; Mielniczuk,João; Knicker,Heike; Bayer,Cimélio; Dick,Deborah Pinheiro; Kögel-Knabner,Ingrid. |
| Organic carbon (C) concentration evaluated by the Walkley-Black method, and total nitrogen(N)concentration determined by Kjeldahl method, were compared with corresponding results of C and N concentrations obtained through the dry combustion method (Elementar Vario EL analyzer), using samples of ten soil layers down to the depth of 107.5 cm of a kaolinitic Typic Paleudult (220-418 g clay kg-1 along the profile) subjected to no-till cropping systems [fallow bare soil, pigeon pea (Cajanus cajan L. Millsp.) plus maize, and lablab (Lablab purpureum L. Sweet) plus maize]. A close correlation (R² > 0.96) was observed between the C results of the Walkley-Black and dry combustion methods, but a correction was suggested to be applied to C results of Walkley-Black... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Walkley-Black; Kjeldahl; Wet combustion; Dry combustion. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500011 |
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| Sato,Juliana Hiromi; Figueiredo,Cícero Célio de; Marchão,Robélio Leandro; Madari,Beáta Emöke; Benedito,Luiz Eduardo Celino; Busato,Jader Galba; Souza,Diego Mendes de. |
| Several methods exist for determining soil organic carbon, and each one has its own advantages and limitations. Consequently, a comparison of the experimental results obtained when these methods are employed is hampered, causing problems in the comparison of carbon stocks in soils. This study aimed at evaluating the analytical procedures used in the determination of carbon and their relationships with soil mineralogy and texture. Wet combustion methods, including Walkley-Black, Mebius and Colorimetric determination as well as dry combustion methods, such as Elemental and Gravimetric Analysis were used. Quantitative textural and mineralogical (kaolinite, goethite and gibbsite) analyses were also carried out. The wet digestion methods underestimated the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic matter; Wet combustion; Dry combustion. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400007 |
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