Water insoluble nitrogen (WIN)

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1. A form of fertilizer in which the nitrogen is not readily available for uptake by plants, and which provides sustained color and growth response, extended response duration and low foliar burn and leaching potential; WIN sources are typically more expensive per pound of nutrient than Water soluble nitrogen (WSN) sources.

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Turf Food that is 4.7% Water Insoluble Nitrogen

Source: http://berks.extension.psu.edu/