Soil Nutrient Requirements
Sixteen nutrients are considered important for rice, where N, P and K are the primary macronutrients; Mg, Ca, and S are secondary macronutrients; and Zn, Fe, Mn, Cu, B, Mo and Cl are micronutrients. Nitrogen (N), phosphorus (P), potassium (K) and sulfur (S) are the most important nutrients for plants.