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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

Figure 1.3: graph of idealized relationship among soil test index, crop response and amount of fertilizer.

  • 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.
return icon.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. 1.

Last Update January 10, 2014



NCDA&CS Agronomic Services Division, Colleen M. Hudak-Wise, Ph.D., Director
Mailing Address: 1040 Mail Service Center, Raleigh NC 27699-1040
Physical Address: 4300 Reedy Creek Road, Raleigh NC 27607-6465
Phone: (919) 733-2655; FAX: (919) 733-2837