Reference soil Namibia 9: Vertisol

Collection date: 
August, 1973
Soil surveyor: 
Creutzberg D & H Scholz
Grootfontein District, 30km E of Tsumeb, Farm Smithfield, lot 541
Climate classification: 

WRB 2006:

WRB 1998:

calcic horizon Grumic Vertisol(Pellic)
Pelli- calcic horizon Vertisol
20-40 cm cambic horizon  
40-110 cm vertic horizon  
secondary carbonates  




Calcari- Eutric Vertisol
Pellic Vertisol
0-20 cm ochric A horizon  
20-110 cm cambic B horizon  
0-20 cm ochric A horizon  
20-110 cm cambic B horizon  
vertic properties  
The altitude of the soil profile relative to mean sea level, specified in meters 1300 m asl
Regional landform basin
Topography of the surrounding country undulating
Physiographic Unit in the immediate surrounding of the site basin floor
The slope refers to the inclination of the land immediately surrounding the site. The measured or estimated slope angle is specified to the nearest per cent 0 %
The physiographic position of the site where the profile is located flat
Form of the slope surrounding the site straight
Slope Aspect of the site
Parent material: 
The main parent rock/ material over which the soil has been formed (1st entry) dolomitic limestone
Mode of Accumulation or deposition of parent material (1st entry) lacustrine sediments
Texture of parent material (1st entry) clayey
Weathering status of solid rock (1st entry) partially or moderately
Resistance against weathering (solid rock) (1st entry) moderate
Depth1 of lithological boundary cm
The main parent rock/ material over which the soil has been formed (2nd entry)  
Resistance against weathering (solid rock) (2nd entry)  
Soil Depth; depth to which roots can easily penetrate throughout the year cm
Hydrology and drainage: 
Depth of groundwater table cm
Groundwater Top cm
Groundwater Bottom cm
Kind of groundwater table no groundwater table observed
Top Stagnating Layer cm
Bottom Stagnating Layer cm
Runoff slow
Flooding frequency never
Estimated permeablity (class) of least permeable part of the profile slow
Drainage Class imperfect
To Drainage Class  
Moisture conditions of the profile: dry from -to 0-20 cm
Moisture conditions of the profile: moist from -to 20-120 cm
Wet From - To cm
Land use: 
Current land use at the site arable farming
Major crops cereals (unspecified)
Main type of irrigation  
Rotation scheme  
Vegetation Type;The natural vegetation at the site  
Status of vegetation
Soil erosion type (1st entry)  
Occurrence of soil aggradation absent
Slope Stability stable
Surface characteristics: 
Microrelief type: small-scale differences in relief in the direct vicinity of the site  
Microrelief Pattern none
Microrelief Height  
Rockiness none
Stoniness none
Average size of stones  
Shape of stones (on average)  
Cracks large cracks (width more than 1 cm, or depth more than 50 cm)
Slaking of aggregates by tillage, rainfall or frost no surface slaking/crusting observed
Evidence of salt non-saline
Evidence of alkali non-alkaline