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Crop Fertilization Based on North Carolina Soil Tests
Table 4.8 Commonly available sources of phosphorus (P)
%N % P2O5
Superphosphate (0-20-0) Ca(H2PO4)2 • H2O + CaSO4 0 18-20
Concentrated superphosphate (0-46-0) Ca(H2PO4)2 • H2O 0 44-52
Monoammonium phosphate (11-48-0) NH4H2PO4 11 48
Diammonium phosphate (18-46-0) (NH4)2HPO4 18 46
Ammonium polyphosphate (10-34-0) (NH4)3HP2O7  H2O 10 34
Phosphoric acid H3PO4 0 55
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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