What does a soil probe measure in an irrigation audit?

• A. Water pressure and flow rate
• B. Soil temperature and moisture
• C. Root depth and soil texture
• D. Head spacing and coverage

Answer: (C)

A soil probe is an essential tool used in irrigation audits primarily to assess soil characteristics directly related to plant health and water efficiency. When discussing what a soil probe measures, the correct answer focuses on root depth and soil texture.

Root depth information is crucial because it helps determine how deep plant roots extend, which influences water uptake and overall irrigation needs. Understanding the root depth allows landscapers to adjust irrigation systems to ensure adequate moisture reaches the roots.

Soil texture, on the other hand, refers to the composition of the soil in terms of sand, silt, and clay. This composition significantly impacts how well the soil retains water and nutrients, as well as how quickly water can infiltrate. A suitable understanding of soil texture enables landscapers to optimize irrigation practices by selecting appropriate watering methods and schedules based on the soil's properties.

The other choices pertain to elements that are important in an irrigation audit but are not functions of a soil probe. Water pressure and flow rate are typically measured with flow meters and pressure gauges, soil temperature and moisture are measured by different sensors, and head spacing and coverage relate to the physical layout of the irrigation system itself. Thus, while all the choices represent important aspects of irrigation, the soil probe specifically targets root depth and soil