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.
Hatfield AL. 1972. Soil test reporting: a nutrient index system. Comm Soil Sci Plant Anal
Hardy DH, Tucker MR, Stokes CE. 2014. Crop fertilization based on North Carolina soil tests. Raleigh (NC
): North Carolina Department of Agriculture and Consumer Services, Agronomic Division. Circular No.
January 10, 2014