What type of nutrients are S, Ca, and Mg classified as?

S (sulfur), Ca (calcium), and Mg (magnesium) are classified as macronutrients - secondary nutrients. This classification stems from their essential roles in plant growth and development, as they are required in greater quantities compared to micronutrients but are not as abundant in plant material as the primary macronutrients (N, P, K).

Calcium is crucial for cell wall structure and stability, and it plays a vital role in plant metabolism. Magnesium is an essential component of chlorophyll, making it significant for photosynthesis, while sulfur is important for the synthesis of amino acids and proteins.

The distinction of these nutrients as secondary macronutrients highlights their necessary presence in the soil and plants, as well as their impact on overall crop health and yield. Understanding this classification is important for effective nutrient management strategies in agriculture.