Parameters Zone I Zone II Zone III Zone IV Total land area
Topological classes
Mountain 44.6 69.2 36.8 35.5 46.9
Hill 21.4 8.8 23.1 12.2 18.2
Pediment 14.7 7.6 15.8 7.0 12.8
Interrill area 7.6 9.0 7.4 11.3 8.1
Fan 2.5 2.1 2.4 2.7 2.3
Lava terrace - 0.2 0.5 20.1 1.5
Others 9.0 3.1 14.0 11.2 10.1
Sum 100.0 100.0 100.0 100.0 100.0
Parent material types
Acidic rocks 50.1 46.3 48.2 56.9 48.5
Metamorphic rocks 26.2 38.2 22.4 5.0 26.3
Sedimentary rocks 13.5 11.5 13.8 0.7 12.3
Quaternary deposits 9.8 3.7 14.6 10.2 10.6
Volcanic ash - - 0.4 23.7 1.7
Others 0.3 0.3 0.6 3.4 0.6
Sum 100.0 100.0 100.0 100.0 100.0
Soil depth classes (cm)
<20 19.0 20.9 17.7 26.8 19.3
20–50 21.6 27.4 20.2 25.4 22.7
50–100 40.5 42.9 38.4 24.9 39.1
>100 18.9 8.9 23.7 22.9 18.8
Sum 100.0 100.0 100.0 100.0 100.0
Soil texture types
Sandy gravel 2.2 1.4 2.5 4.4 2.3
Silt sandy loam 52.6 69.4 44.5 27.8 51.6
Clay loam 41.5 27.1 47.9 63.1 42.1
Clay 3.7 2.2 5.2 4.7 4.1
Sum 100.0 100.0 100.0 100.0 100.0