Crop Fertilization Based on North Carolina Soil Tests
Table 4.5 Properties of fertilizer materials
Material
%N
%P2O5
%K2O
Soil Reaction *
Lime §
Salt Index †
Ammonium
nitrate
33.5
0
0
A
180
105
Monoammonium
phosphate
11
48
0
A
180
30
Diammonium
phosphate
18
46
0
A
180
34
Ammonium sulfate
(23.7% S)
21
0
0
A
538
69
Ammonium
polyphosphate
10
34
0
A
180
-
Urea
46
0
0
A
180
75
Liquid nitrogen
30
0
0
A
180
-
Calcium nitrate
15.5
0
0
N
0
65
Potassium
nitrate
13
0
44
N
0
74
Muriate
of potash
0
0
60
N
0
116
Potassium sulfate
(18% S)
0
0
50
N
0
46
Sodium nitrate
16
0
0
B
0
100
Magnesium sulfate
(10% Mg; 13% S)
0
0
0
N
0
44
Sulfate of potash-magnesia
(11% Mg; 22% S)
0
0
22
N
0
43
Nitrate of
soda-potash
15
0
14
N
0
19
Normal
superphosphate
(12% S)
0
20
0
N
0
10
Triple
superphosphate
0
46
0
N
0
10
Gypsum
(19% S; 22% Ca)
0
0
0
N
0
8
* A = acid; B = basic; N = neutral. § lb of lime required to neutralize acid from 100 lb of nitrogen. † Salt index for equal weights of materials, NaNO3 = 100.
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
