Certified Professional Horticulturist (CPH) Practice Exam

What is the primary purpose of testing soil before planting?

1. To determine pest presence

2. To assess soil texture

3. To establish nutrient and pH levels

4. To identify weed seeds

The correct answer is: To establish nutrient and pH levels

The primary purpose of testing soil before planting is to establish nutrient and pH levels. Soil testing provides essential information about the availability of key nutrients such as nitrogen, phosphorus, and potassium, which are critical for plant growth. Additionally, it helps determine the pH level of the soil, which affects nutrient availability and overall soil health. Knowing the nutrient levels allows gardeners and farmers to create a targeted fertilization plan that can enhance plant growth and productivity. Adjusting the pH as needed can further optimize nutrient uptake, ensuring that plants can access the nutrients they need to thrive. This foundational knowledge from a soil test can significantly influence planting decisions, crop selection, and management practices aimed at achieving optimal growth and yield.