What are secondary components of fertilizer?

Secondary components of fertilizer include nutrients that are essential for plant growth but are required in smaller quantities compared to primary nutrients (nitrogen, phosphorus, and potassium). Key secondary nutrients include calcium, magnesium, and sulfur. These elements play vital roles in various physiological processes, such as cell wall structure, chlorophyll production, and enzyme function. Ensuring adequate levels of these secondary nutrients helps promote overall plant health and productivity.