Soil genesis and classification and soil resources databases

Lambrechts, Jan; Macvicar, C. N.

doi:10.1080/02571862.2004.10635065

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…Le Roux and Du Prezz (2006) and Lambrechts and MacVicar (2004) have shown that the profiles of soils under both urban and agricultural fields have a higher subsoil compaction than that of uncultivated soils. The compaction however seems to be more intense in rural agricultural than in urban agricultural fields.…”

Section: Discussionmentioning

confidence: 99%

“…According to Kuipers and van de Zande (1994), typical values for a 530-kg ox are 130 kPa standing and 250 kPa walking. Many soils also display hardsetting properties which can extend into the subsoil (Lambrechts and MacVicar 2004).…”

Section: Discussionmentioning

confidence: 99%

“…While many subsoil problems in Hutton soils are associated with the slow permeability of the upper B horizon and consequent seasonal waterlogging, both accelerated acidification and sodicity have also become an increasing problem in some cropping systems (Thompson 1986). Many Hutton soils also display hardsetting properties which can extend into the subsoil horizons in some soils (Lambrechts and MacVicar 2004). Hardsetting is a primarily physical phenomenon which results from a combination of packing materials in a porphyric fabric, limited biological activity, low organic matter content and high bulk density (Mullins et al 1990).…”

mentioning

confidence: 99%

“…Hardsetting is a primarily physical phenomenon which results from a combination of packing materials in a porphyric fabric, limited biological activity, low organic matter content and high bulk density (Mullins et al 1990). Furthermore, most of these Hutton soils are highly weathered resulting in low levels of plant available nutrients including phosphorus, sulphur, nitrogen and micronutrients (Lambrechts and MacVicar 2004).…”

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confidence: 99%

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Soil properties and subsoil constraints of urban and peri-urban agriculture within Mahikeng city in the North West Province (South Africa)

Materechera

2016

J Soils Sediments

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Purpose Urban and peri-urban agriculture is becoming increasingly important as a source of income and food for the urban population in South Africa. While most studies on urban agriculture have focused their attention on surface soils, there is dearth of information regarding subsoil properties. This study examined properties of subsoil horizons that may impede root growth and productivity of crops under urban agriculture. Materials and methods The properties of topsoil (0-20 cm) and subsoil horizons (20-40 cm) of four profiles from plots within the city of Mahikeng (25°48′ S and 25°38′ E) were examined to determine the nature of subsoil constraints that can limit root growth and crop productivity. The plots were selected in an area extending through four residential suburbs of the city, and two plots with a long history of cultivation were purposely selected from each suburb to represent the main cropping systems and soil types. Soil physical (penetrometer resistance, bulk density, hydraulic conductivity), chemical (pH, exchangeable Ca, Mg, K, Na, phosphorus and boron) and biological (root growth, organic carbon, microbial biomass, enzyme activity) properties were measured in the profiles. Results and discussion Even though there was a large variability between profiles, the results revealed high bulk density (mean 2.06 Mg m −3

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Soil properties and subsoil constraints of urban and peri-urban agriculture within Mahikeng city in the North West Province (South Africa)

Materechera

2016

J Soils Sediments

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Perspectives on soil series classification based on comparison of two contrasting scenarios

Laker

Nortjé

2022

Advances in Agronomy

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Advances in pedology in South Africa

Roux

Hensley

Huyssteen

2010

South African Journal of Plant and Soil

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The ability of soil to serve as a unique buffer of water, organic carbon, nutrients, pH, redox and temperature is recognised in environmental research. A detailed study on hardpan carbonate and dorbank horizons in the commonly occurring 'heuweltjies' of the arid Namaqualand coastal region revealed a 'sepiolitic' hardpan carbonate centre through 'sepiolitic' / 'petrosepiolitic' (hardened) to the dorbank horizon on the edges. Footprints of ferrolysis manifests in various properties of duplex and plinthic soils of the semi-arid eastern Free State as (1) acidity, (2) colour, (3) Fe-Mn, (4) mottles and concretions, (5) CEC and ( 6) abrupt textural differentiation. Soils with melanic A horizons cover 2% of South Africa and are confined to regions with annual rainfall between 550 and 800 mm (aridity index of 0.2-0.5). The understanding of soil formation is applied to divide a land type into soilscapes with a more homogeneous soil distribution pattern. The quantification of the water regime of South African soils showed that 'freely drained' soils may have significant periods of drainable water.

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Soil genesis and classification and soil resources databases

Cited by 5 publications

References 22 publications

Soil properties and subsoil constraints of urban and peri-urban agriculture within Mahikeng city in the North West Province (South Africa)

Soil properties and subsoil constraints of urban and peri-urban agriculture within Mahikeng city in the North West Province (South Africa)

Perspectives on soil series classification based on comparison of two contrasting scenarios

Advances in pedology in South Africa

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