Residual P (kg・ha−1 of P2O5) | Grain Productivity (Mg・ha−1)* | Net Revenue (US$) |
0 | 120.48 c | 105.13 |
60 | 256.32 b | 210.73 |
70 | 256.37 b | 208.47 |
80 | 393.44 a | 326.26 |
90 | 295.82 ab | 238.42 |
100 | 189.37 bc | 142.85 |