Which element is commonly associated with soil fertility?

Nitrogen is a critical element in soil fertility because it is an essential nutrient for plant growth. It plays a vital role in the synthesis of amino acids, which are the building blocks of proteins, and is also a key component of nucleic acids (DNA and RNA). High nitrogen availability is necessary for vigorous vegetative growth and is closely linked to higher yields in many crops. In many agricultural systems, nitrogen is considered the nutrient that most often limits plant growth.

While other elements like calcium, manganese, and iron are also important for various plant functions and can affect growth, nitrogen's direct impact on the overall fertility of the soil makes it a primary focus for many agronomic practices. For example, nitrogen deficiency can result in stunted growth and yellowing of leaves, while excess nitrogen can lead to rapid, lush growth that may be more susceptible to disease. These factors highlight the importance of nitrogen management in maintaining soil fertility and agricultural productivity.