This is a quick reference guide to the nutrient contents of fertilizer materials, broken down by primary and secondary nutrient sources (nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur), as well as micronutrient materials. Also included are comments for pertinent materials that will further help you.
The following tables can be used as quick reference guides to fertilizer materials. These materials may be used alone or blended with other fertilizer materials to form a multinutrient fertilizer.
The actual nutrient content may vary from what is listed, depending upon the manufacturer, the purity of the product, or other materials blended with the product. Most values are for the fertilizer-grade product and not the pure chemical. The chemical formulas given are for the primary active compound.
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Charles C. Mitchell, Extension Agronomist, Professor, Agronomy and Soils, Auburn University
Reviewed December 2021, Nutrient Content of Fertilizer Materials, ANR-0174