The effect of N fertilizer rates on agronomic parameters, yield components and yields of maize grown on Alfisols of North-western Ethiopia

Environmental Systems Research

Table 7 Partial budget and dominance analysis of maize grain yield response for different N fertilizer rates

N fertilizer rate (kg ha⁻¹)	Urea (kg ha⁻¹)	Grain yield (kg ha⁻¹)	Gross return (Birr ha⁻¹)	Variable cost (Birr ha⁻¹)			Gross margin (Birr ha⁻¹)	Cost dominance^a
N fertilizer rate (kg ha⁻¹)	Urea (kg ha⁻¹)	Grain yield (kg ha⁻¹)	Gross return (Birr ha⁻¹)	Fertilizer	Fertilizer application	Total	Gross margin (Birr ha⁻¹)	Cost dominance^a
0	0	3655.61	2193.37	0	0	0	2193.37	Non-dominated
30	65.2	4396.29	2637.77	117.36	160	277.36	2360.41	Non-dominated
60	130.4	5093.91	3056.35	234.72	160	394.72	2661.63	Non-dominated
90	195.7	5625.61	3375.37	352.26	160	512.26	2863.11	Non-dominated
200	434.8	5911.19	3546.71	782.64	160	942.64	2604.07	Dominated

^aNon-dominated are treatments that gave higher gross margin than treatments with lower N fertilizer rates; dominated is the treatment that gave lower gross margin than treatments with lower N fertilizer rates