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

Table 1

The composition and characterization of the biochar.

Parameters	Grass	Chat
pH	6.69 ± 0.4	5.1 ± 0.2
Electric conductivity (dS m^−1)	0.38 ± 0.03	0.25 ± 0.02
Cation exchange capacity (cmolc kg^−1)	29.9 ± 2.4	19.8 ± 1.3
Organic matter (OM)	6.7 ± 1.2	1.5 ± 0.07
Sodium	0.59 ± 0.03	0.27 ± 0.01
Potassium	9.90 ± 1.2	4.1 ± 1.1
Magnesium	8.1 ± 0.9	3.45 ± 0.9
Nitrogen	0.45 ± 0.02	0.24 ± 0.03
Sulfur	52.45 ± 3.45	10.4 ± 1.5
Phosphorus	6.34 ± 0.8	0.42 ± 0.06