Science / Biology / Macronutrients: 1. Elements needed by plants in relatively large (primary) or smaller (secondary) quantities. 2. Foods needed by animals daily or on a fairly regular basis.
Science / Biology / Primary Macronutrients: Elements that plants require in relatively large quantities: nitrogen, phosphorus, and potassium. MORE
Science / Biology / Secondary Macronutrients: Elements that plants require in relatively small quantities: calcium, magnesium, and sulfur. MORE
Science / Biology / Micronutrients: Elements that are required by plants in very small quantities, but are toxic in large quantities: iron, manganese, molybdenum, copper, boron, zinc, and chloride. MORE