Ace the Certified Arborist Test 2026 – Branch Out and Leaf Your Mark!

The correct answer focuses on nitrogen, phosphorus, and potassium, which are often referred to as the primary macronutrients essential for plant growth. These nutrients play vital roles in various physiological functions in plants.

Nitrogen is crucial for the synthesis of amino acids, which are the building blocks of proteins. It also plays a significant role in chlorophyll formation, affecting the plant’s ability to photosynthesize effectively. Adequate nitrogen levels can lead to healthy foliage and overall plant vigor.

Phosphorus is important for energy transfer within the plant. It is a key component of ATP (adenosine triphosphate), which is necessary for energy storage and transfer. Phosphorus also supports root development and flowering, making it critical in both early plant growth and reproduction.

Potassium contributes to several physiological processes, including water regulation, enzyme activity, and the overall resilience of the plant. It helps in the synthesis of proteins and starches while also improving drought resistance and disease tolerance.

Measuring these three macronutrients allows arborists and horticulturists to assess soil fertility and make informed decisions regarding fertilization and soil amendments to promote healthy plant growth. Other nutrient combinations mentioned in the choices may be important for specific situations, but they do not hold the same