CPP CPP Irrigation & Water Management 2 — Questions and Answers
Question 1: Smart irrigation controllers adjust watering schedules based on which type of real-time data?
- Soil nutrient levels
- Weather and ET data (Correct answer)
- Plant growth rate
- Fertilizer application history
Correct answer: Weather and ET data
Smart controllers use weather data and ET calculations to automatically adjust irrigation schedules based on current plant water needs.
Question 2: What is the recommended practice when irrigating slopes to prevent runoff and erosion?
- Apply water as fast as possible
- Use cycle-and-soak programming to match application rate to infiltration rate (Correct answer)
- Increase sprinkler head pressure
- Apply all water in a single long cycle
Correct answer: Use cycle-and-soak programming to match application rate to infiltration rate
Cycle-and-soak programming applies water in short intervals, allowing time for infiltration and preventing runoff on slopes.
Question 3: Which irrigation scheduling method uses soil moisture sensors to trigger irrigation only when soil moisture drops below a set threshold?
- Calendar-based scheduling
- ET-based scheduling
- Soil moisture-based scheduling (Correct answer)
- Time-domain reflectometry scheduling
Correct answer: Soil moisture-based scheduling
Soil moisture-based scheduling uses sensors to monitor actual soil moisture and irrigates only when plants need water, avoiding over- or under-watering.
Question 4: What condition results when soil is irrigated beyond its field capacity and the excess water displaces air in pore spaces?
- Drought stress
- Waterlogging/anaerobic conditions (Correct answer)
- Salt accumulation
- Nutrient leaching only
Correct answer: Waterlogging/anaerobic conditions
Waterlogging occurs when irrigation exceeds field capacity, saturating the soil and creating anaerobic conditions harmful to plant roots.
Question 5: Which irrigation practice is most effective for reducing salt accumulation in the root zone in arid US climates?
- Reducing irrigation frequency
- Leaching with excess water to push salts below the root zone (Correct answer)
- Switching to foliar fertilization
- Applying lime to the soil surface
Correct answer: Leaching with excess water to push salts below the root zone
Leaching applies extra water to flush accumulated salts below the root zone, protecting plants in arid, saline conditions.
Question 6: What is the primary advantage of using recycled or reclaimed water for landscape irrigation in the US?
- It contains higher nutrient levels than potable water
- It conserves potable water supplies and reduces demand on freshwater sources (Correct answer)
- It eliminates the need for fertilization
- It is always free of all pathogens
Correct answer: It conserves potable water supplies and reduces demand on freshwater sources
Reclaimed water use conserves potable water supplies by providing an alternative water source for non-potable landscape irrigation needs.
CPP CPP Irrigation & Water Management 2
Smart irrigation controllers adjust watering schedules based on which type of real-time data?