Factors that transformed maize productivity in Ethiopia

Table 8 Regression of maize grain yield on various factors across selected administrative regions of Ethiopia (2004–13)

Factors	Parameters	Administrative Regions
Factors	Parameters	Ethiopia	Oromia	Amhara	SNNP	Tigray	BSG
Area under MVs (%)	b-value	0.50***	0.40**	0.40***	0.49***	1.58	0.84**
Area under MVs (%)	R²	0.84	0.67	0.86	0.78	0.11	0.73
Area under NP fertilizer (%)	b-value	0.51**	0.32*	1.04*	0.74**	0.51	0.20
Area under NP fertilizer (%)	R²	0.60	0.47	0.34	0.65	0.30	0.02
NP application rate (kg/ha) – overall maize growers	b-value	0.77***	0.56*	0.39**	0.79*	0.47	1.05*
NP application rate (kg/ha) – overall maize growers	R²	0.09	0.06	0.13	0.27	0.22	0.01
NP application rate (kg/ha) – exclusively those applying applying fertilizers	b-value	0.18	−0.13	0.22	0.21	0.08	−0.05
	R²	−0.09	−0.12	0.23	−0.04	−0.08	−0.13
Area under organic fertilizer (%)	b-value	−1.31*	−0.62	−0.86***	−1.56**	−0.05	−1.31**
Area under organic fertilizer (%)	R²	0.52	0.10	0.81	0.73	0.06	0.73

*, **, and *** denote significant difference from zero at p < 0.05, p < 0.01 and p < 0.001 levels, respectively (source: calculated by the authors from CSA www.csa.gov.et)