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.
Hardy DH, Tucker MR, Stokes CE. 2013. Crop fertilization based on North Carolina soil tests. Raleigh (NC): North Carolina Department of Agriculture and Consumer Services, Agronomic Division. Circular No. 1.
September 27, 2013
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