NPK 15:5:35 is a fertilizer formula, indicating the percentage of nitrogen (N), phosphorus (P), and potassium (K) it contains.
Specifically, it contains 15% nitrogen, 5% phosphorus (as P2O5), and 35% potassium (as K2O). This formulation is often used in agriculture to provide plants with essential nutrients for various stages of growth, especially during fruit and tuber development and maturation.