Name a key nutrient required for healthy plant growth.

Nitrogen is a vital nutrient for healthy plant growth as it plays a crucial role in several key processes. It is primarily a component of amino acids, which are the building blocks of proteins. Proteins are essential for the growth and development of plant tissues and are involved in various biochemical reactions. Nitrogen is also a vital part of chlorophyll, the molecule responsible for photosynthesis, which allows plants to convert sunlight into energy. Therefore, an adequate supply of nitrogen directly impacts a plant's ability to produce energy, grow, and thrive.

While phosphorus, potassium, and calcium are also important nutrients for plants, nitrogen often takes precedence in discussions of plant health due to its significant influence on growth rates and foliage development. Phosphorus is crucial for root development and flowering, potassium aids in overall plant function and stress resistance, and calcium is important for cell wall structure and stability. However, without sufficient nitrogen, plants may exhibit stunted growth, yellowing of leaves, and poor overall health, highlighting nitrogen's essential role in the nutrient balance required for optimal plant development.