Table 1: Physical soil characteristics of the soils in the Kaduna study area.

Morphological unitParent materialSoil typeHorizonDepth (cm)Sand (2000–63 μm)Silt (63–2 μm)Clay (<2 μm)
(%)(%)(%)

Upper pedimentGrus slope depositsHaplic Lixisols
(chromic)
Ap0–5553114
Bt*5–55372241
2Btw55+313039
Haplic Lixisols
(colluvic)
Ap0–20652411
2Btw*20–50392338
2Bwo50+452035
Haplic LixisolsAp0–10622513
Bt*10+512227

Lower pedimentGrus slope deposits and river depositsHaplic Acrisols
(arenic)
Ap0–1561309
Bo15–30562519
Bto*30–50412732
2Bo50+373231
Haplic AcrisolsAp0–10274627
Bto*10–45163945
Bwo45+164044
Haplic Acrisols
(arenic)
Ap0–1058366
Bl10–3061336
Bt*30–80442729
2Bt80+412831

River valleyRiver depositsGleyic Fluvisols
(dystric, siltic)
Ap0–20136225
Bsg*20–60+156223
Gleyic Fluvisols
(dystric, siltic)
Ap0–15254431
Bog*15–45+136324
Haplic Fluvisols
(arenic)
Ap0–20582913
Bg20–35523315
2Bsg*35–80+602020

Lower plainPisolite slope deposits and river depositsPisoplinthic Acrisols
(chromic)
Ap0–15314623
Bto*15–45203743
2Bwo45–55+184042
Gleyic Acrisols
(siltic)
Ap0–15196219
Bto*15–25206218
Pisoplinthic Acrisols
(chromic)
Ahc0–10294229
Bto*10–30283834
2Bw30–60+223246

Upper plainPisolite slope depositsHaplic Plinthosols
(dystric)
Ap0–15432433
Bv*15–30433522
Haplic Plinthosols
(hyperdystric, clayic)
Ahc0–5213742
Btv*5–30183151
Bov30–80213148

Diagnostic horizons.