Farmstand Nutrients An innovative integrated management strategy drives sustainable vegetable production in southwest China: Higher yield with reduced net GHG emissions ScienceDirect 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 Lawn Food: 16 4 8 Complete Balanced NPK (32 ounce)