Advanced 16 4 8 Lawn Fertilizer Liquid Lawn Food Spring & Summer Concentrated Spray Any Grass Type Fish and Seaweed Kelp Balanced NPK Simple LESCO 18 3 6 Liquid Fertilizer 50% Controlled Release Nitrogen with Iron Understanding NPK: The Three Key Nutrients in Fertilizers When you look at a fertilizer label, you'll often see three numbers. These numbers stand for nitrogen (N), phosphorus (P), and potassium (K). Each Nutri Kelp Sea Kelp Liquid Fertilizer with Potassium Mirimichi Green 32 Ounce Bottle