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Crop Fertilization Based on North Carolina Soil Tests
Table 1.1 Relationship between soil test index and yield
Soil Test Index Crop Response to Nutrient Application *
Range Rating P K Mn Zn Cu
0–10 very low high high high high high
11–25 low high high high high high
26–50 medium medium medium none none none
51–100 high none low/none none none none
100+ very high none none none none none
* Crop response to phosphate (P2O5) and potash (K2O) decreases as the soil test index approaches 50.
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