Plant Density and Time of White Lupine (Lupinus Albus L.) Relay Cropping with Tef (Eragrostis tef (Zucc.) Trotter) in Additive Design in the Highlands of Northwest Ethiopia

Table 6

Economic profitability of tef-lupine intercropping combined over years as influenced by plant density and relay intercropping of white lupine with tef in 2016 and 2017 main cropping seasons in northwest Ethiopian highlands.

Treatment	IR (cm)	TL (weeks)	Adj. tef GY (t/ha)	Adj. tef SY (t/ha)	Adj. lupine GY (t/ha)	GB (birr/ha)	VB (birr/ha)	NB (birr/ha)	MRR (%)
Sole tef			1.6	4.32		51920	1006	50914	1.6
T4	40	7	1.44	4.63	1.32	66485	3846	62639	413
T5		14	1.58	4.83	1.24	69365	4256	65109	602
T6		21	1.62	4.93	0.9	66215	4946	61269
T1	20	7	0.71	3.03	0.89	38505	5887	32618
T2		14	1.13	3.9	0.94	51860	7996	43864	533
T3		21	1.31	4.39	0.69	54465	8982	45483	164

IR = inter-row spacing of lupine; TL = time of lupine intercropping in weeks; GY = grain yield, SY = straw yield price; GB = gross field benefit; VB = variable cost; NB = net benefit; MRR = marginal rate of return; EB kg⁻¹ of tef grain yield, straw yield, and lupine grain yield were 23.00, 3.50, and 13.00. Labour cost per day⁻¹ was 80.00.