Certified Professional Horticulturist (CPH) Practice Exam

What is the primary purpose of fertilization in horticulture?

1. To stimulate plant growth

2. To enhance soil structure

3. To prevent diseases

4. To encourage pest resistance

The correct answer is: To stimulate plant growth

The primary purpose of fertilization in horticulture is to stimulate plant growth. Fertilizers supply essential nutrients that plants require to develop and thrive. These nutrients, such as nitrogen, phosphorus, and potassium, play crucial roles in various biological processes. For instance, nitrogen is vital for the synthesis of proteins and chlorophyll, which is necessary for photosynthesis. Phosphorus supports root development and flowering, while potassium helps with overall plant health and stress resistance. While enhancing soil structure, preventing diseases, and encouraging pest resistance are important aspects of horticultural practices, they are not the primary objectives of fertilization. Soil structure can be improved through organic matter addition and proper management practices rather than through fertilization alone. Disease prevention involves integrated pest management techniques and might require specific treatments beyond standard fertilization. Similarly, pest resistance is achieved through various cultural practices, genetic selection, and sometimes natural pest control methods, rather than solely relying on fertilization. Thus, stimulating plant growth through the provision of essential nutrients is indeed the primary goal of applying fertilizers in horticulture.