Soil test value (0.1 M H2SO4-P, mg·kg−1) | kg P2O5 ha−1 to apply (to raise soil P to 80 mg·kg−1) |
30 | 600 |
35 | 525 |
40 | 475 |
45 | 425 |
50 | 375 |
55 | 325 |
60 | 275 |
65 | 200 |
70 | 125 |
75 | 50 |
80 | 0 |