Table 1. Salt Index of Fertilizer Materials and Soil Amendments Material and Analysis Salt Index
Partial Salt Index *
Nitrogen: Anhydrous ammonia, 82% N Ammonium nitrate, 34% N Ammonium sulfate, 21% N, 24% S
47.1 104.0 88.3 74.4
0.572 3.059 3.252 1.618 2.250 2.221 4.194 6.080 0.390 0.224 0.405 0.405 0.456 0.455
Urea, 46% N
Urea-ammonium nitrate solution: 28% N (39% ammonium nitrate, 31% urea) 32% N (44% ammonium nitrate, 35% urea)
63.0 71.1 65.0
Calcium nitrate, 15.5% N Sodium nitrate, 16.5% N
100.0
Phosphorus: Ordinary superphosphate, 20% P 2 0 5 Triple superphosphate, 45% P 2 0 5
7.8 10.1 26.7 24.3 29.2 20.0
Monoammonium phosphate: 11% N, 52% P 2 0 5
10% N, 50% P 2 0 5
Diammonium phosphate, 18% N, 46% P 2 0 5 Ammonium polyphosphate, 10% N, 34% P 2 0 5
Phosphoric acid, 54% P 2 0 5 Phosphoric acid, 72% P 2 0 5 Potassium: Potassium chloride, 60% K 2 0 Potassium hydroxide, 83.6% K 2 0 Potassium nitrate, 13% N, 44% K 2 0 Potassium sulfate, 50% K 2 0, 18% S
1.613 ** 1.754 **
116.2
1.936 1.015 1.219 0.852 1.971 0.097 2.720 7.533 2.960 0.247 0.002 2.687 0.083 0.042 4.636
69.5 42.6 43.4 8.4 68.0 90.4 59.2
Sulfate of potash-magnesia, 22% K 2 0, 11% Mg, 22% S Monopotassium phosphate, 52.2% P 2 0 5 , 34.6% K 2 0 Potassium thiosulfate, 25% K 2 0, 17% S
Sulfur: Ammonium thiosulfate, 12% N, 26% S Ammonium polysulfide, 20% N, 40% S
Gypsum, 23% Ca, 17% S Magnesium oxide, 60% Mg
8.1 1.7
Magnesium sulfate, 10% Mg, 14% S Miscellaneous: Calcium carbonate, lime, 35% Ca Dolomite, 21.5% Ca, 11.5% Mg
44.0
4.7 0.8
Manure salts, 20% Manure salts, 30%
112.7 91.9
3.067 * The salt index of a mixed fertilizer containing N, P and K is the sum of the partial salt index per unit (20 lbs) of plant nutrient times the number of units due to each component in the formulation. ** Per 100 lbs of H 3 PO 4
Fertilizer Salt Index • Fact Sheet No. 15 • Revised 5/2002 A & L Great Lakes Laboratories • 3505 Conestoga Drive • Fort Wayne, IN 46808 • 260-483-4759 • www.algreatlakes.com
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