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Greenhouse Fertilizer Calculators

A label for water soluble fertilizer often gives mixing directions and electrical conductivity (EC) readings for just one or a few different concentrations. To mix or analyze concentrations in the middle requires extrapolating or computing.

Sometimes, we want to adjust our injector to hit a target concentration.

We may know the percent nitrogen of a fertilizer, but not have mixing instructions for parts per million (ppm).

It’s easier and more accurate to mix a full bag rather than weighing out portions, but labels rarely tell us how to mix a full bag.

These calculators are designed to “do the math” for these real-life production decisions.

Visit the UNH Extension Greenhouse, Nursery & Garden Centers webpage for more information and resources

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