SOIL MAPPING AND TESTING
The Global Positioning System (GPS) was used for locating the soil samples and navigation in the field. The soil mapping was made using a semi-detailed soil survey and grid system with an intensity of one observation auger for each 60 feddans (25 ha). The soil sampling was carried out with an intensity of one sampled site (two depths, 0 – 30 cm and 30 – 60 cm) for each 240 feddans (100 ha). The performing of above mentioned grid resulted in 3105 and 1034 observation and sampled sites, respectively. The soils were mapped using the soil color, texture, soil depth, topography, vegetation, erosion hazard and surface features. Thirty two soil profiles were excavated, described and sampled according to their different genetic horizons. Field infiltration rates using double ring infiltrometer method were carried out for important extensive soil mapping units. At the end of the field work, a total of 1384 soil samples were delivered to the laboratories of the Land and Water Research Centre of the Agricultural Research Corporation for analysis, 133 of them (profile sample) for routine chemical and physical analysis and the remainder 1251 (auger sample) for the determination of electric conductivity (EC.), soil pH and sodium adsorption ratio (SAR).
Title: Soil Samples Distribution Map
Area: TABA Agricultural Project, River Nile State, Sudan
Projection: Geographic Coordinate System
Author: Land and Water Research Center
Keywords: Sudan, Soil samples, Irrigation project, River Nile State.
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