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Agronomic Services

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

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