Agronomy Degree Practice Exam

What is the most limiting nutrient for plant growth on a worldwide basis?

1. Nitrogen

2. Boron

3. Phosphorus

4. Potassium

The correct answer is: Nitrogen

Nitrogen is recognized as the most limiting nutrient for plant growth globally due to its crucial role in various plant processes, including protein synthesis and the formation of nucleic acids. It is a fundamental component of amino acids, which are the building blocks of proteins, and it is also integral to the structure of DNA and RNA. Because nitrogen is often found in insufficient quantities in soils, plants may struggle to grow and produce effectively when this nutrient is limited. Additionally, the overall productivity of agricultural systems is frequently restricted by nitrogen availability. While other nutrients like phosphorus, potassium, and micronutrients such as boron are essential for plant development, nitrogen is often the primary nutrient that dictates growth rates. In many ecosystems and farming practices, nitrogen is applied in large quantities to optimize yield, underlining its significance in supporting robust plant health and productivity on a global scale.