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Agronomic Services

Crop Fertilization Based on North Carolina Soil Tests
Table 4.17  Commonly available sources of iron (Fe)
% 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
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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