Effect of Biochar and Inorganic Fertilizer on the Soil Properties and Growth and Yield of Onion (Allium cepa) in Tropical Ethiopia

Table 4

Metallic ion effect on soil.

Treatment	Na	K	Mg
Wfb^b	0.06 ± 0.001	2.86 ± 0.9	2.91 ± 0.2
Bc^b	0.24 ± 0.01	3.68 ± 0.7	3.01 ± 0.9
Bg^a	0.55 ± 0.02	9.27 ± 0.9	7.96 ± 0.6
If ^a	0.64 ± 0.03	11.41 ± 1.1	7.17 ± 0.5

Bg = biochar grass; Bc = biochar chat; If = inorganic fertilizer; Wfb =  controlled plot (free from biochar and fertilizer); Na = sodium; K = potassium; Mg = magnesium. Treatments with the same letters were not significantly different at .