Natural Fertilizers A natural fertilizer is a plant fertilizer derived from all natural sources, and Republic Mills has an extensive inventory of options to meet your specific needs. Alfalfa Meal View Product All Natural Poultry Compost/Litter View Product All-Natural Pre-Emergence View Product Azomite Granular View Product Azomite Powder View Product Blood Meal View Product Cottonseed Meal View Product Epsom Salts/Magnesium Sulfate View Product Feather Meal View Product Fish Meal View Product Fossil Flour/Diatomaceous Earth (Red) View Product Graze-ON View Product Kelp Meal View Product Play-ON View Product Sulfate of Potash View Product Sulfur (powder) View Product