Crop Fertilization Based on North Carolina Soil Tests
Figure 1.3 Idealized relationship among soil test index, crop response and
the amount of fertilizer (P2O5 and K2O) required
- A — expected response very high
- B — response low to medium
- C — little or no response expected
- D — test levels far in excess of plant requirements, no response.Modified from: Hatfield AL. 1972. Soil test reporting: a nutrient index system. Comm Soil Sci Plant Anal 3(5): 425-36.