Crop Fertilization Based on North Carolina Soil Tests
Table 4.17 Commonly available sources of iron (Fe)
Source
Formula
% Fe
Ferrous sulfate
FeSO4 • 7H2O
19–21
Ferric sulfate
Fe(SO4)3 • 4H2O
23
Ferrous ammonium sulfate
(NH4)2SO4 FeSO4 • 6H2O
14
Ferrous ammonium phosphate
FeNH4PO4 • H2O
29
Iron chelates
NaFe EDTA
5–14
NaFe HEDTA
5–9
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.
Last Update
February 15, 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
