Crop Fertilization Based on North Carolina Soil Tests
Table 4.8 Commonly available sources of phosphorus (P)
Source
Formula
%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
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
