Assessment of soil fertility status of Vertisols under selected three land uses in Girar Jarso District of North Shoa Zone, Oromia National Regional State, Ethiopia

Environmental Systems Research

Table 6 Main effects of land uses and soil depths on exchangeable bases, exchangeable aluminum, CEC, PBS, and ECEC of soils of the study area

	Ca	Mg	K	Na	CEC	ECEC	EAl	PBS (%)
	(cmol(+) kg⁻¹)						EAl	PBS (%)
Land use
CUL	6.71^c	4.78^c	0.32^b	0.07^b	43.06^c	14.07^c	0.39^a	27.57^c
GRL	15.62^a	8.88^a	0.41^a	0.11^a	53.77^a	26.29^a	0.08^c	46.53^a
NFL	9.94^b	5.49^b	0.40^a	0.08^b	51.11^b	17.23^b	0.21^b	31.13^b
LSD (0.05)	1.04	0.31	0.02	0.01	1.83	1.50	0.12	1.66
SEM (±)	0.33	0.10	0.01	0.00	0.85	0.62	0.06	0.53
Soil depth (cm)
0–20	10.97^a	6.59^a	0.39^a	0.07^b	50.11^a	19.90^a	0.20	35.98
20-40	10.55^b	6.17^b	0.36^b	0.10^a	48.51^b	18.49^b	0.25	35.42
LSD (0.05)	0.32	0.25	0.01	0.01	1.49	0.70	NS	NS
SEM (±)	0.27	0.08	0.00	0.00	0.48	0.50	0.05	0.43
CV (%)	7.48	3.74	3.34	8.42	2.88	5.82	6.58	3.68

Means within a column for the same factor followed by the same letters in superscripts are not significantly different from each other at P = 0.05
LSD least significant difference, NS not significant, SEM standard error of mean, CEC cation exchange capacity, ECEC effective cation exchange capacity, PBS percent base saturation, CUL cultivated land, GRL grazing land, NFL natural forest land