The major nutrients are

The major nutrients are N, P and K.
The macronutrients are taken up in larger quantities; hydrogen, oxygen, nitrogen and carbon contribute to over 95% of a plant's entire biomass on a dry matter weight basis. Along with phosphorus and potassium.
Nitrogen is a major constituent of several of the most important plant substances. For example, nitrogen compounds comprise 40% to 50% of the dry matter of protoplasm, and it is a constituent of amino acids, the building blocks of proteins It is also an essential constituent of chlorophyll.
Phosphorus is the structural component of the nucleic acids: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), as well as a constituent of fatty phospholipids that are important in membrane development and function.
Potassium is essential for enzyme activity including enzymes involved in primary metabolism. It plays a role in turgor regulation, affecting the functioning of the stomata and cell volume growth.