Effect of Mineral Nitrogen, Phosphorus, and Potassium Fertilizers on the Productivity of Faba Bean (Vicia faba L.) in Acidic Soils of Wolaita Zone, Southern Ethiopia
Table 11
Mean marginal rate of return of faba bean influenced by N, P, and K fertilizers.
NPK treatments
UGY (t ha−1)
AGY (t ha−1)
USY (t ha−1)
ASY (t ha−1)
GFB (USD ha−1)
TVC (USD ha−1)
NB (USD ha−1)
MRR (%)
Control
1.08
0.97
1.29
1.16
917.69
0
917.69
—
23 kg N ha−1
2.77
2.49
2.98
2.68
2,350.26
14.59
2,335.66
9,719
23 kg N × 30 kg K2O ha−1
3.52
3.17
4.39
3.95
2,992.92
32.67
2,960.24
3,455
23 kg N × 60 kg K2O ha−1
3.67
3.30
4.75
4.28
3,122.27
50.76
3,071.51
615
23 kg N × 46 kg P2O5 × 30 kg K2O ha−1
4.54
4.09
5.75
5.18
3,861.10
68.84
3,792.27
3,987
23 kg N × 46 kg P2O5 × 60 kg K2O ha−1
4.62
4.16
6.33
5.70
3,934.15
79.94
3,854.21
558
23 kg N × 92 kg P2O5 × 30 kg K2O ha−1
4.67
4.20
5.96
5.36
3,972.14
105.00
3,867.14
52
23 kg N × 92 kg P2O5 × 60 kg K2O ha−1
4.97
4.47
6.83
6.15
4,232.41
123.08
4,109.33
1,340
Note: UGY, unadjusted grain yield; AGY, adjusted grain yield; USY, unadjusted straw yield; ASY, adjusted straw yield; GFB, gross field benefit; TVC, total variable cost; NB, net benefit; USD ha−1 = United States dollar per hectare; and MRR, marginal rate of return.
