Table 10: Mean interaction effects of varieties and nitrogen rate on partial budget and marginal rate of return mean grain yield of maize at Bako Tibe, western Ethiopia.

ItemsMaize varieties + nitrogen kg ha−1
BH-543BH-540
(50% RR)
BH-543
(50% RR)
BH-660 (50% RR)BH-661 (50% RR)BH-140
(50% RR)
BH-540
(100% RR)
BH-543
(100% RR)
BH-661
(100% RR)
BH-660
(100% RR)
BH-140
(100% RR)

Grain yield kg ha−130293663375540294859353541394012519941163981
Adjusted grain yield kg ha−127263297338036264373318237253611467937043583
Gross field benefit EB ha−11022312363126731359816399119311396913541175471389213436
Total field cost EB ha−101388138813881388138840504050405040504050
Net benefit EB ha−1102231097511285122101501110543991994911349798429386
Values to cost ratio7.918.138.8010.817.602.452.343.332.432.32
Marginal rate of return (MRR)54.1676.53143.16344.97

Note. Grain price = EB 3.75 kg−1, labour cost = EB 21.00/day, yield was down adjusted with 10% coefficient, cost of urea = EB 12.75 kg−1 DAP = EB 15.00 kg−1, RR = recommended rate of nitrogen fertilizer (110 kg N ha−1), and D = dominated treatment.