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Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: I. spatial analysis Rev. Bras. Ciênc. Solo
Berg,M. van Den; Oliveira,J. B..
The spatial variability of strongly weathered soils under sugarcane and soybean/wheat rotation was quantitatively assessed on 33 fields in two regions in São Paulo State, Brazil: Araras (15 fields with sugarcane) and Assis (11 fields with sugarcane and seven fields with soybean/wheat rotation). Statistical methods used were: nested analysis of variance (for 11 fields), semivariance analysis and analysis of variance within and between fields. Spatial levels from 50 m to several km were analyzed. Results are discussed with reference to a previously published study carried out in the surroundings of Passo Fundo (RS). Similar variability patterns were found for clay content, organic C content and cation exchange capacity. The fields studied are quite...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil variability; Systematic sampling; Latosols; Semivariance analysis.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832000000200015
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Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: II. quality of soil maps Rev. Bras. Ciênc. Solo
Berg,M. van Den; Oliveira,J. B..
The quality of semi-detailed (scale 1:100.000) soil maps and the utility of a taxonomically based legend were assessed by studying 33 apparently homogeneous fields with strongly weathered soils in two regions in São Paulo State: Araras and Assis. An independent data set of 395 auger sites was used to determine purity of soil mapping units and analysis of variance within and between mapping units and soil classification units. Twenty three soil profiles were studied in detail. The studied soil maps have a high purity for some legend criteria, such as B horizon type (> 90%) and soil texture class (> 80%). The purity for the "trophic character" (eutrophic, dystrophic, allic) was only 55% in Assis. It was 88% in Araras, where many soil units had...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil variability; Map quality; Sampling; Latosols.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832000000200016
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