Campbell Scientific Sentek TriSCAN® Manual v 1.2a User Manual

Page 59

TriSCAN Manual Version 1.2a

Page 52

Appendix 6: Relative Effect of Fertilizer Materials on the

Soil Solution

Table 14. Relative Effect of Fertilizer Materials on the Soil Solution (from Ayars and Westcot)

Material

Salt Index

Partial Salt Index

per Unit of Plant

Nutrient

Anhydrous ammonia

47.1

0.572

Ammonium nitrate

104.7

2.990

Ammonium nitrate-lime

61.1

2.982

Ammonium phosphate (11-48)

26.9

2.442

Ammonium sulphate

69.0

3.253

Calcium carbonate (limestone)

4.7

0.083

Calcium cyanamide

31.0

1.476

Calcium nitrate

52.5

4.409

Calcium sulfate

8.1

0.247

Diammonium phosphate

29.9

1.614

Dolomite (calcium and magnesium carbonates)

0.8

0.042

Kainit, 13.5 %

105.9

8.475

Kainit, 17.5 %

109.4

6.253

Manure salts, 20%

112.7

5.636

Manure salts, 30%

91.9

3.067

Monoammonium phosphate

34.2

2.453

Monocalcium phosphate

15.4

0.274

Nitrate of soda

100.0

6.060

Nitrogen solution, 37%

77.8

2.104

Nitrogen solution, 40%

70.4

1.724

Potassium chloride, 50%

109.4

2.189

Potassium chloride, 60%

116.3

1.936

Potassium chloride, 63%

114.3

1.812

Potassium nitrate

73.6

5.336

Potassium sulphate

46.1

0.853

Sodium chloride

153.8

2.899

Sulphate of potash-magnesia

43.2

1.971

Superphosphate, 16%

7.8

0.487

Superphosphate, 20%

7.8

0.390

Superphosphate, 45%

10.1

0.224

Superphosphate, 48%

10.1

0.210

Urea

75.4

1.618

The salt index is for various fertilizer materials when applied at equal weights. Sodium nitrate, with a salt
index of 100, is used as a base for the index.