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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.
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