Salt index

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1. Used to measure the effect of fertilizers on soil solution, and is expressed as a ratio of increase in osmotic pressure produced by a material to that produced by the same weight of sodium nitrate.

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An example of a salt index from Ultra Gro Plant Foods.
Source: http://www.ultragroplantfood.com/saltindex.htm

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A listing of some common fertilizer sources and their salt index values.
Source: http://www.hort.cornell.edu/department/faculty/good/growon/salt.html