Archive · 5 Oct 2026
How Smart Irrigation Uses Soil and Weather to Water Crops
Smart irrigation helps farms water crops based on what is happening in the field.
A sensor checks how much water is in the soil.
A controller compares that reading with a level chosen for the system.
If the soil is too dry, the controller opens a valve and water flows to the crops.
The sensor keeps checking as the water reaches the soil.
When the soil is moist enough, the controller closes the valve.
Rain and weather information can also help the system decide to water less or not at all.
This can make watering more precise than following the same schedule every day.
Smart irrigation systems use soil, weather, or plant information to decide when crops need water.
Soil moisture sensors measure water in the soil, often near crop roots.
A controller compares sensor readings with preset moisture thresholds and signals a valve to start or stop watering.
Some systems use lower and upper thresholds: irrigation starts when soil is too dry and stops when it reaches the desired moisture level.
Rain sensors and weather data can reduce or suspend watering, helping avoid unnecessary irrigation.
- Who
- Farmers using smart irrigation systems.
- What
- Systems use soil moisture sensors, controllers, valves, and sometimes weather data to adjust irrigation.
- When
- When soil readings or weather conditions indicate irrigation is needed; the article gives no publication date.
- Where
- In crop fields, with sensors commonly placed in the soil around the root zone.
- Why
- To provide crops with needed water while reducing unnecessary irrigation.
- Common sensor location
- In the soil, usually around the root zone.
- Moisture measurement
- Sensors estimate soil moisture by detecting changes in the soil’s electrical properties.
- System components
- Sensor, controller, and valve.
- On-demand watering
- A lower moisture threshold can start watering; a higher threshold can stop it.
- Weather inputs
- Systems may use temperature, rainfall, humidity, wind, and sunlight.
- Evapotranspiration
- Weather-based systems may estimate water loss through evaporation and transpiration.
- Rain response
- A rain sensor or weather data can prevent, reduce, or suspend irrigation.