What is the Salt Index?
The Salt Index, or SI, is a numeric ratio between the increase in osmotic pressure produced by a specific fertilizer product compared to that produced by the exact weight of Sodium Nitrate.Osmotic pressure needs to be applied to a pure solvent to prevent the solvent from passing into a solution via osmosis. Osmotic pressure indicates the strength of salt solutions in competition with plant roots for water. Various fertilizers have different salt indexes, which show the probability of fertilizer burn.
