North Carolina Building Contractor License Practice Exam

When testing soil, what is the importance of soil reaction known as?

1. Soil type

2. Soil texture

3. Soil PH

4. Soil moisture

The correct answer is: Soil PH

The importance of soil reaction is referred to as soil pH. Soil pH is a crucial measure that indicates the acidity or alkalinity of the soil, which significantly affects nutrient availability, microbial activity, and overall soil health. A suitable pH range is essential for optimal plant growth, as many nutrients are most accessible to plants within specific pH levels. For instance, most plants thrive in soil with a pH between 6.0 and 7.5, where nutrients like nitrogen, phosphorus, and potassium are readily available. If the soil is too acidic (low pH) or too alkaline (high pH), it can lead to nutrient deficiencies or toxicities, which can impede plant growth and yield. Testing soil pH, therefore, is vital in agricultural practices, landscaping, and environmental management to ensure that the soil conditions support the desired plants or crops effectively.