Effect of NPS and Zinc Fertilizer Rates on Growth and Yield of Onion (Allium cepa L.) at Shewa Robit, North Shewa, Ethiopia

Table 5

Summary of partial budget and marginal rate of return analysis for response of onion production to different rates of NPS and Zinc sulfate.

NPS (kg/ha)	Zn (%)	TVC (ETB/ha)	AvY (t/ha)	AjY (t/ha)	GFB (ETB/ha)	NB (ETB/ha)	MRR (%)
0	0	—	23.26	20.93	627,900.00	628,020.00	0
121	0	4,418.98	24.55	22.09	662,700.00	658,431.02	688.19
242	0	7,861.11	31.04	27.94	838,200.00	830,218.89	4990.74
0	0.25	9,027.00	25.91	23.32	699,600.00	690,543.00	D
363	0	11,260.80	26.40	23.76	712,800.00	701,539.20	D
121	0.25	12,645.98	26.30	23.67	710,100.00	697,454.02	D
242	0.25	16,688.11	27.95	25.15	754,500.00	737,961.89	D
0	0.5	17,244.00	25.56	23.00	690,000.00	672,876.00	D
363	0.25	19,687.80	27.69	24.92	747,600.00	727,942.20	D
121	0.5	20,662.98	25.23	22.71	681,300.00	660,547.02	D
242	0.5	25,005.11	31.04	27.94	838,200.00	813,074.89	D
0	0.75	25,500.00	24.41	21.96	658,800.00	633,570.00	D
363	0.5	28,704.80	31.62	28.46	853,800.00	825,035.20	D
121	0.75	29,218.98	27.39	24.65	739,500.00	710,311.02	D
242	0.75	32,861.11	34.87	31.38	941,400.00	908,628.89	313.64
363	0.75	36,760.80	33.99	30.59	917,700.00	880,969.20	D

TVC: total variable cost; AvY: average yield; AjY: adjustable yield; GFB: gross field benefit; NB: net benefit; ETB: Ethiopian Birr; D: dominated treatment; MRR: marginal rate of return; selling price of onion at farm gate = 30 ETB kg⁻¹; purchasing costs of NPS fertilizer = 20.00 ETB kg⁻¹; cost of ZnSO₄ = 1200 ETB kg⁻¹; labor cost = 100 ETB per man day.