Smart irrigation thrives when smart farmers use it
The 2025 Irrigation Show & Education Week brought together growers, consultants and tech tinkerers hungry for tools that can stretch every drop. In the middle of the bustle, Dr. Stacia L. Davis Conger, state irrigation specialist and associate professor of irrigation engineering at LSU’s AgCenter, delivered a seminar that stirred the crowd with equal parts science and straight talk.
Conger explained that the steady rise of smart irrigation is reshaping how producers plan, apply and protect their most precious resource. Water may be timeless, but the technology that tends it is racing ahead.
Conger opened with a clarification of a term that gets tossed around as casually as a garden hose. What exactly is smart technology? In her words, it involves devices that monitor weather and site conditions and “make decisions” that adjust an irrigation schedule.
Although that might sound futuristic, the objective is simple. Smart irrigation aims to apply the right amount of water at the right time automatically. The charm of the system lies in its promise that growers can get precision without constant presence. Yet the sophistication can be misleading because smart technology is not superhuman. It cannot mend a misaligned head or heal a hobbled layout. It can only guide a good system, not rescue a rotten one.
Smart systems trim the tendency for over-irrigation by adjusting schedules in response to shifts in weather that lower evapotranspiration. When rainfall arrives these tools pause or reduce planned watering. They turn weather and soil signals into timely tweaks that protect yields and budgets.
What they will not do is erase the consequences of poor design or sloppy upkeep. Sensors cannot compensate for a system that sprays more at the sky than the soil. Controllers cannot correct leaky lines or lazy maintenance.
The message was blunt and bright.
Smart tools are helpful but only if the groundwork has been laid with competence.
From there, Conger sketched out the stubborn question that has haunted growers since the first furrow. When should we irrigate and for how long?
Smart tech cannot conjure answers by magic but it can guide irrigators toward informed choices that echo real water requirements. By listening to the atmosphere and the soil these systems whisper reminders that keep farmers grounded in data rather than guesswork.
She discussed the two broad categories of smart irrigation technology. Weather-based tools, often called ET technologies, determine irrigation needs by calculating evapotranspiration. ET represents the combined water loss from evaporation at the soil surface and transpiration from plant tissues. These devices digest local weather inputs like temperature, solar radiation, relative humidity and wind speed. They study the sky then schedule accordingly.
Sensor-based technologies dive underground instead. They monitor soil moisture directly and report how much water remains available to plants. By reading the soil’s subtle signals these sensors help irrigators sense shortages before the plants suffer.
Eventually the industry hopes to fuse the strengths of both weather- and sensor-based systems into a seamless hybrid that thinks with the clarity of climate data and the intimacy of soil insight.
To appreciate how these technologies work Conger walked the audience through the language of soil water.
Moisture can sit anywhere between saturation and wilting point. Saturation occurs when all the pore space is filled with water, leaving no room for air. Once some of that excess drains away under gravity the soil reaches field capacity, which represents the upper threshold of water that plants can comfortably use. Wilting point marks the other extreme, when moisture levels plummet so low plants can no longer pull enough water to survive. Somewhere between these boundaries sit the levels growers care most about.
Water moves in and out of this system through rainfall, irrigation, evaporation and transpiration. The last two processes often get lumped together as ET, which is influenced by a swirling cocktail of weather. Hotter temperatures, stronger sun, lower humidity and brisker winds all demand higher levels of water from plants.
Different crops drink at different rates so knowing each plant’s ET profile helps irrigators tailor timing and volume.
Conger explained how the atmosphere and irrigation activities interact with measurement tools. Rainfall can be tracked with rain gauges or soil moisture sensors.
Irrigation volumes can be monitored with flow meters or the same soil sensors that register water content. The trick is understanding the balance between “field capacity” and the “maximum allowable depletion.”
Maximum allowable depletion refers to the threshold of water loss that can occur before crops begin to experience stress. Between this line and field capacity lies the sweet spot known as “readily available water.”
Keeping soil moisture within this zone is the essence of effective irrigation. Smart tech seeks to keep growers in that safe region without over- or underwatering.
She then surveyed the various gadgets that aim to make this balance easier. Rain sensors may not qualify as fully “smart” but they sparked the movement. These simple switches halt irrigation when they detect rain so systems do not water during a storm. Soil moisture sensors measure the actual water content of the ground, telling growers exactly what sits beneath the surface.
Weather-based irrigation controllers (also known as WBICs or ET controllers) gather weather inputs either from onsite stations or regional networks then generate schedules based on calculated ET. When combined with flow meters, these tools help verify how much water truly enters the field.
Another piece of the puzzle is Smart Water Application Technologies (SWAT). This industry initiative tests, evaluates and labels irrigation products that deliver proven performance in managing water use. SWAT helps buyers sort through the growing sea of devices by providing standardized data on effectiveness. Products that pass SWAT scrutiny give growers confidence that the savings they expect are savings they will see.
Conger emphasized that smart irrigation is not simply a stack of sensors and circuits. It is a philosophy that favors precision over habit and insight over intuition. It gives growers the power to respond to the landscape with the speed of software and the subtlety of science. It encourages a mindset that honors water as the lifeblood of production and treats every gallon with care.
She cautioned that this technology does not replace the role of an attentive irrigator. “These tools are here to help you make better decisions, not to make the decisions for you,” she stated.
Smart irrigation thrives when smart humans use it.
by Enrico Villamaino
