Which of the following is not a micronutrient?

Nitrogen is considered a macronutrient, which is essential for plant growth in relatively large amounts. It plays a crucial role in processes such as photosynthesis and the synthesis of amino acids and proteins, which are vital for plant development. In contrast, zinc, iron, and copper are classified as micronutrients because they are required by plants in much smaller quantities but are still necessary for various physiological functions, including enzyme activity and chlorophyll production. Understanding the difference between macronutrients and micronutrients is fundamental in plant nutrition, as it influences fertilization strategies and overall plant health.