HORTICULTURE

Detailed explanation-1: -Answer. Answer :Primary nutrients, also known as macronutrients, are those usually required in the largest amounts. They are carbon, hydrogen, nitrogen, oxygen, phosphorus, and potassium. Secondary nutrients are those usually needed in moderate amounts compared to the primary essential nutrients.

Detailed explanation-2: -Macronutrients are essential for plant growth and a good overall state of the plant. The primary macronutrients are Nitrogen (N), Phosphorus (P), and Potassium (K). Nitrogen is essential for plant development, since it plays a fundamental role in energy metabolism and protein synthesis.

Detailed explanation-3: -Primary nutrients are known as macronutrients. They are required in huge amounts by plants. Micronutrients are trace nutrients. They are relatively required in small amounts when compared to macronutrients.

Detailed explanation-4: -Carbohydrates, fat and protein are called macronutrients.