Water soluble nitrogen (WSN)

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1. A form of fertilizer in which the nitrogen is readily available for uptake by plants, and which provides quick color and growth response, limited response duration and high foliar burn and leaching potential; WSN sources are typically less expensive per pound of nutrient than Water insoluble nitrogen (WIN) sources.

B1237-fertilizer-label.jpg

Fertilizer injectors apply water soluble fertilizers, pesticides, and other products used in commercial crop production.
Source: http://pubs.caes.uga.edu/caespubs/pubcd/B1237.htm