Which of the following is NOT considered a micronutrient essential for plant growth?

Nitrogen is not considered a micronutrient essential for plant growth; rather, it is classified as a macronutrient. Micronutrients are required in smaller quantities compared to macronutrients and play specialized roles in plant metabolism. On the other hand, nitrogen is vital for the synthesis of amino acids, proteins, and nucleic acids, and it is needed in larger amounts for overall plant health and development.

Boron, copper, and zinc are all examples of micronutrients, which, despite being required in smaller amounts, are crucial for various physiological functions, including enzyme activation, photosynthesis, and nutrient uptake. Thus, recognizing the distinction between macronutrients and micronutrients is essential in understanding plant nutrition.