Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: II. quality of soil maps

Berg, Matthijs van den; Oliveira, João

doi:10.1590/s0100-06832000000200016

Cited by 4 publications

(2 citation statements)

References 8 publications

(14 reference statements)

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“…Samples from two depths were analysed in the laboratory: 0-20 and 60-80 cm. The 60-80 cm layer was chosen to represent the subsurface soil, because it is important for crop growth but relatively little affected by soil management, and to facilitate comparison with the studies of Berg & Klamt (1997a,b), and also with the soil surveys of Oliveira et al (1977), and Prado et al (1981), as described by Berg & Oliveira (2000).…”

Section: Field Methodsmentioning

confidence: 99%

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Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: I. spatial analysis

Berg

Oliveira

2000

Rev. Bras. Ciênc. Solo

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SUMMARYThe 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 homogeneous with respect to these relatively stable soil characteristics. Spatial variability of other characteristics (resin extractable P, pH, base-and Al-saturation and also soil colour), varies with region and, or land use management. Soil management for sugarcane seems to have induced modifications to greater depths than for soybean/wheat rotation. Surface layers of soils under soybean/wheat present relatively little variation, apparently as a result of very intensive soil management. The major part of within-field variation occurs at short distances (< 50 m) in all study areas. Hence, little extra information would be gained by increasing sampling density from, say, 1/km 2 to 1/50 m 2 . For many purposes, the soils in the study regions can be mapped with the same observation density, but residual variance will not be the same in all areas. Bulk sampling may help to reveal spatial patterns between 50 and 1.000 m.Index terms: soil variability, systematic sampling, Latosols, semivariance analysis.(1) Part of Doctor's thesis of the first author. Received for publication in april of 1999 and aproved in april of 2000.

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Section: Field Methodsmentioning

confidence: 99%

“…Major crops are sugarcane and citrus in Araras and sugarcane and soybean/wheat rotation in Assis. More information on soil types is given by Berg & Oliveira (2000), who discussed the relation between soil variability and the quality of existing soil maps in the regions.…”

Section: The Study Regionsmentioning

confidence: 99%

Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: I. spatial analysis

Berg

Oliveira

2000

Rev. Bras. Ciênc. Solo

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Validation of topsoil texture derived from agricultural soil maps by current dense soil sampling

Stępień

Gozdowski

Samborski

et al. 2016

J. Plant Nutr. Soil Sci.

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Agricultural soil maps were created to facilitate the management of fields. Such maps, at very large scale (1:5000), cover almost the entire agricultural land in Poland. These maps can be very useful for precision field management. However, they were prepared about 40–50 years ago using old mapping techniques with mainly field (organoleptic) examination of soil. For this reason it is necessary to verify agreement between such maps with the current soil status. In the case of detection of disagreements it is important to identify the causes and propose methods for improving soil maps. Only few studies were made in this aspect. The soil texture (ST) of the upper layer, as presented on the agricultural soil maps from the 1960s and 1970s, was compared with the actual ST of the same four fields in northern and central Poland. For laboratory ST determination, soil samples were collected in a dense sampling network. On average, the agreement of the ST presented on the agricultural soil maps and determined in this study was classified as medium for three fields and good for one field. However, the presence of field areas with poor agreement between the ST determined in this study and that shown on the agricultural maps was detected in all investigated fields. Identified causes for this comprised imprecision of ST determination using the organoleptic method, the generalization of the soil quality maps, and erosion processes during the years between soil mapping and this investigation. The improvement of ST presentation on the large scale soil maps might be achieved by quite denser soil sampling for ST analysis supported by ECa, yield and NDVI maps.

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Potential of soil minerals to sequester soil organic carbon

et al. 2023

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Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: II. quality of soil maps

Cited by 4 publications

References 8 publications

Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: I. spatial analysis

Variability of apparently homogeneous soilscapes in São Paulo state, Brazil: I. spatial analysis

Validation of topsoil texture derived from agricultural soil maps by current dense soil sampling

Potential of soil minerals to sequester soil organic carbon

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