Agronomic Services

Crop Fertilization Based on North Carolina Soil Tests

Table 4.2  Nitrogen fertilizer substitutions *
Fertilizer Grade Recommended	Substitute Fertilizers
20 lb of 5-10-5	10 lb of 10-10-10 + 2 lb of 0-46-0
17 lb of 6-6-18	10 lb of 10-10-10 + 3.5 lb of 0-0-60
12.5 lb of 8-0-24	5.0 lb of ammonium sulfate (21-0-0) + 5 lb of 0-0-60
7.5 lb of 15-0-14	5.0 lb of ammonium sulfate (21-0-0) + 1.75 lb of 0-0-60
1.0 lb of nitrogen	5.0 lb of ammonium sulfate (21-0-0)
16 lb of 3-9-9	5.0 lb of 10-10-10 + 2.0 lb of 0-46-0 + 1.5 lb of 0-0-60
10 lb of 5-5-15	5.0 lb of 10-10-10 + 1.5 lb of 0-0-60
3.0 lb of 15-0-14	2.5 lb of ammonium sulfate (21-0-0) + 0.75 lb 0-0-60
0.5 lb of nitrogen	2.5 lb of ammonium sulfate (21-0-0)
6.0 lb of 8-0-24	2.5 lb of ammonium sulfate (21-0-0) + 2.5 lb 0-0-60
20 lb of 5-10-10	10 lb of 10-20-20
* Many of the fertilizers suggested on NCDA&CS soil test reports are agricultural fertilizers and may not be found at garden centers or discount stores. A dealer who sells supplies to farmers may be the most likely source for the suggested fertilizers. All amounts of fertilizer listed in this table provide 1 lb of nitrogen per 1000 ft².
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.