Review Version - Fertilizer Label

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This indicates the sources of nitrogen and their percentages. This can help you determine the amounts of fast- and slow-release nitrogen available. To maintain an extended supply of nutrients that can be absorbed by plants, consider a fertilizer that contains 50% or more of a slow-release Nitrogen source. Slow-release nitrogen is known as water insoluble nitrogen (WIN). Sometimes it is listed as slowly available nitrogen. In this example, the label states that 10% of the nitrogen is water-insoluble compared to the total amount of nitrogen—18%. Over 50% won’t dissolve in water, and therefore it is a slow-release fertilizer.