To avoid lengthy descriptions, however, and to show the geographical distribution, interrelationships and salient features of the soil in a comprehensive manner, a schematic map was chosen as the most suitable form of data representation. Such a map of southern Africa, south of latitude 16°30′...
Soil surveys were first carried out in the 1920s, and the first national soil map was produced in 1940. Several regional studies were done in the 1960s, with the national Land Type Survey completed in 2002. Subsequently, the transfer of soil data to digital format has allowed a wide range...
For a cartographic guide to the distribution of the world’s major soils, featuring links to short descriptive entries on each soil type, see the interactive world map. The soil profile Soil horizons Podzol soil profilePodzol soil profile from Ireland, showing a bleached layer from which humus ...
Map courtesy of Dr. Nate Chaney. Soil organic carbon concentrations in sandy soils varied by continent and by climate zone. Most of the sandy soils from the databases are found in North America (− 120° to − 70°E), Africa and Europe (5° to 50°E), and Eastern Australia (150...
2. In contrast to temporally stable soil properties such as texture or bulk density, the spatial variation of dynamic soil properties, such as salinity, is especially challenging to measure, map, and monitor due to their complex temporal and spatial nature. To assess (i.e., measure, map, ...
The map is color-coded to show areas of very high (red), high (orange), moderate (yellow), low (green) and very low (white) susceptibility to liquefaction. This type of map is valuable in making land-use and development decisions. Image by USGS. Liquefaction Susceptibility Mapping An ...
1c-d). Differences exist for near-surface soil moisture where extra-tropical regions in the northern hemisphere and South Africa are not sufficiently reflected in the model results, and for sub-surface soil moisture where the models generally overestimate the positive sensitivity. When grouping the ...
provision of a soils map which shows the distribution of Fe and exploration of alternative options, other than agronomic approaches, which supply dietary Fe requirements of communities at larger risk of deficiency should be explored. We explored the magnitude by which farmer management might contribute...
GlobalSoilMap. Toward a Fine-Resolution Global Grid of Soil Properties. In Advances in Agronomy (Vol. 125, pp. 93–134). Basta, N. T., Ryan, J. A., & Chaney, R. L. (2005). Trace element chemistry in residual-treated soil: key concepts and metal bioavailability. Journal of ...
The groundwave sampling depth is frequency dependent, so multifrequency groundwave data could be used to map the shallow, three-dimensional water content distribution (Galagedara et al., 2005; Grote et al., 2010). GPR type (air-launched GPR) uses the magnitude of the reflection from the ...