Effect of the Irrigation Interval and Nitrogen Rate on Yield and Yield Components of Onion (Allium cepa L.) at Arba Minch, Southern Ethiopia

Table 8

Partial budget analysis in respect of irrigation and fertilizer N levels on marketable yield of onion.

Treatment combination	Unadjusted marketable yield (t ha^−1)	Adjusted marketable yield (t ha^−1)	Gross benefit (Birr ha^−1)	Total variable cost (Birr ha^−1)	Net benefit (Birr ha^−1)	Cost dominance
Ir4N0	15.14	13.63	163512	57872	105640
Ir4N1	16.51	14.86	178308	58527	119781
Ir4N2	18.21	16.39	196668	59182	137486
Ir4N3	17.92	16.13	193536	59837	133699	D
Ir3N0	18.60	16.74	200880	64872	136008	D
Ir3N1	22.61	20.35	244188	65260	178928
Ir3N2	25.99	23.39	280692	66182	214510
Ir3N3	25.87	23.28	279396	66837	212559	D
Ir2N0	23.23	20.91	250884	72872	178012	D
Ir2N1	28.31	25.48	305748	73527	232221
Ir2N2	33.57	30.21	362640	74182	288458
Ir2N3	33.20	29.88	358560	74834	283726	D
Ir1N0	21.54	19.39	232632	105872	126760	D
Ir1N1	28.86	25.97	311688	106527	205161	D
Ir1N2	33.70	30.33	363960	107182	256778	D
Ir1N3	34.12	30.71	368496	107837	260659	D

Ir1 = 3 days irrigation interval; Ir2 = 6 days irrigation interval; Ir3 = 9 days irrigation interval; Ir4 = 12 days irrigation interval; N0 = no nitrogen fertilizer; N1 = 50 kg nitrogen; N2 = 100 kg nitrogen; N3 = 150 kg nitrogen; D = dominated.