Soil Assessment along Toposequences in Rural Northern Nigeria: A Geomedical Approach

Table 1

Physical soil characteristics of the soils in the Kaduna study area.

Morphological unit	Parent material	Soil type	Horizon	Depth (cm)	Sand (2000–63 μm)	Silt (63–2 μm)	Clay (<2 μm)
					(%)	(%)	(%)
Upper pediment	Grus slope deposits	Haplic Lixisols; (chromic)	Ap	0–5	55	31	14
			Bt*	5–55	37	22	41
			2Btw	55+	31	30	39
		Haplic Lixisols; (colluvic)	Ap	0–20	65	24	11
			2Btw*	20–50	39	23	38
			2Bwo	50+	45	20	35
		Haplic Lixisols	Ap	0–10	62	25	13
			Bt*	10+	51	22	27
Lower pediment	Grus slope deposits and river deposits	Haplic Acrisols; (arenic)	Ap	0–15	61	30	9
			Bo	15–30	56	25	19
			Bto*	30–50	41	27	32
			2Bo	50+	37	32	31
		Haplic Acrisols	Ap	0–10	27	46	27
			Bto*	10–45	16	39	45
			Bwo	45+	16	40	44
		Haplic Acrisols; (arenic)	Ap	0–10	58	36	6
			Bl	10–30	61	33	6
			Bt*	30–80	44	27	29
			2Bt	80+	41	28	31
River valley	River deposits	Gleyic Fluvisols; (dystric, siltic)	Ap	0–20	13	62	25
			Bsg*	20–60+	15	62	23
		Gleyic Fluvisols; (dystric, siltic)	Ap	0–15	25	44	31
			Bog*	15–45+	13	63	24
		Haplic Fluvisols; (arenic)	Ap	0–20	58	29	13
			Bg	20–35	52	33	15
			2Bsg*	35–80+	60	20	20
Lower plain	Pisolite slope deposits and river deposits	Pisoplinthic Acrisols; (chromic)	Ap	0–15	31	46	23
			Bto*	15–45	20	37	43
			2Bwo	45–55+	18	40	42
		Gleyic Acrisols; (siltic)	Ap	0–15	19	62	19
			Bto*	15–25	20	62	18
		Pisoplinthic Acrisols; (chromic)	Ahc	0–10	29	42	29
			Bto*	10–30	28	38	34
			2Bw	30–60+	22	32	46
Upper plain	Pisolite slope deposits	Haplic Plinthosols; (dystric)	Ap	0–15	43	24	33
			Bv*	15–30	43	35	22
		Haplic Plinthosols; (hyperdystric, clayic)	Ahc	0–5	21	37	42
			Btv*	5–30	18	31	51
			Bov	30–80	21	31	48

∗Diagnostic horizons.