The growing plants need which of the following elements in the largest quantity?

Plants require sixteen essential elements for growth, but nitrogen (N), phosphorus (P), and potassium (K) are needed in the largest quantities - these are the primary macronutrients. Among all nutrients, nitrogen is typically required in the greatest amount as it's a crucial component of amino acids, proteins, chlorophyll, and nucleic acids. Calcium, ammonia (which provides nitrogen), and phosphorus are also important but not needed in quantities as large as nitrogen.