injury to a plant resulting from excess fertilizer salts in the surrounding soil.

fertilizer burn (Wikipedia)
Fertilizer burn on a leaf.

Fertilizer burn is defined as leaf scorch resulting from over-fertilization, usually referring to excess nitrogen salts.

Fertilizer burn is the result of desiccation of plant tissues due to osmotic stress, creating a state of hypertonicity.

Fertilizers vary in their tendency to burn roughly in accordance with their salt index.

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