Table 3. Levels of heavy metals (mg/kg) in soil samples collected from Mojo area farmlands in central Ethiopia.

Metals	Levels of heavy metals (mg/kg) in soil samples		Reference values (mg/kg)
	Under Tomato Cultivation	Under Cabbage Cultivation
As	24.50±0.60	24.06±0.05	14a
Pb	37.93±0.0	35.80±0.17	10b
Cd	5.30±0.3	4.76±0.15	≤ 0.3c
Zn	98.86±1.45	93.66±1.92	50b
Cu	25.96±0.3	25.50±0.62	20b
Fe	46426.67±141.80	41410.00±191.57	-
Mn	1763.33±47.25	1696.67±15.27	2000d
Cr	36.23±0.4	35.93±0.30	100b
Hg	6.26±0.40	7.30±0.43	≤ 0.3c
Ni	35.58±0.56	30.50±0.81	50d
Co	15.13±0.30	14.93±0.25	8b

^a[66]

^b[44]

^c[11]

^d[54]