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

Table 9

Marginal rate of return (MRR) in respect of irrigation and fertilizer N levels on marketable yield of onion.

Treatment combination	Total variable cost (Birr ha^−1)	Net benefit (Birr ha^−1)	Marginal rate of return (%)	Rank
Ir4N1	58527	119781	2159	D
Ir4N2	59182	137486	2703	C
Ir3N1	65260	178928	682	E
Ir3N2	66182	214510	3859	B
Ir2N1	73527	232221	241	F
Ir2N2	74182	288458	8586	A

Ir2 = 6 days irrigation interval; Ir3 = 9 days irrigation interval; Ir4 = 12 days irrigation interval; N1 = 50 kg nitrogen; N2 = 100 kg nitrogen.