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Basic Soil-Plant Interactions
Table 2.2.4 Salt Index (SI) for Various Fertilizers
Fertilizer SI (NaNO
3
= 100)
Anhydrous Ammonia 47.1 Urea 74.4 Ammonium Sulphate 68.3
Urea-ammonium Nitrate
63.0 (28-0-0) 71.1 (31-0-0) Monoammonium Phosphate 26.7 Ammonium Polyphosphate 20.0 Potassium Chloride 120.1 Potassium Sulphate 46.0
Sources: Mortvedt 2001, McCauley et al. 2003
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