Macronutrients are nutrients that are absorbed by plants in large quantities. These are found and needed in plants in relatively higher amounts than micronutrients. Macronutrients are essential for plants as they are readily absorbed and utilized for various physiological processes, including photosynthesis, protein synthesis, and overall growth. The macronutrients required by plants are carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), potassium (K), sulphur (S), calcium (Ca), and magnesium (Mg).