Insight 02 · Agriculture
Irrigation, from the calendar to the soil.
For most of its history irrigation ran on a schedule: open the gate on Tuesday, close it on Wednesday. The water didn’t know whether the crop needed it. Today a probe in the root zone reports the moisture every few minutes, a valve opens because the field asked, and the water used by each zone is a number on a screen. This page is about how that came about, what is moving in the field now, where the market stands, how a modern farm runs its water, and what it returns.
Every era moved the decision closer to the root.
First the water went where the land sloped. Then it reached the plant. Then the field became a map, and the soil started reporting its own moisture. The question each time was the same: does this field need water now, and how much?
Canals, flood and furrow irrigation by gravity; the farmer’s eye and the calendar.
Water went where the land sloped, when the roster said.
Drip and centre-pivot irrigation; pumps and pressurised networks.
Water reached the plant, not the field. Timing still came from a schedule.
GPS in the tractor, yield monitors; the first soil-moisture probes.
The field became a map. Yield varied within it, and now you could see where.
Auto-steer and variable-rate application; probes with cellular telemetry; weather stations on the farm.
The right amount in the right place; the soil’s own water read from the office.
Low-power radio (LoRaWAN) for probes and valves on battery; satellite imagery of crop health; valve controllers.
A probe every zone, for years on one battery; irrigation started by the reading, not the roster.
Farm platforms joining soil, weather, valves and meters; water accounting per field and season; rain holds; crop-stage targets.
Water as a managed input with a budget, a record and a reason for every litre.
The probe decides.
Soil moisture at the root depth, judged against the crop’s stage, is replacing fixed schedules; the valve opens on a threshold and stops on a target.
Water becomes an account.
Litres per zone, per field and per season are kept like money, because in many regions water is now licensed, metered or priced.
The weather station stays home.
A station on the farm, not the airport’s forecast, decides rain holds and frost warnings.
Everything on battery.
Low-power radio has put sensors where no cable or mains reaches, which is most of a farm.
Pressure on withdrawals.
Agriculture takes most of the world’s freshwater, and in five countries more than 90 % of cultivated land is equipped for irrigation; the regulatory and reputational pressure on irrigation efficiency is rising with it.
UN News · FAO AQUASTAT 2025 · 12 Dec 2025of global freshwater withdrawals go to agriculture.
UN News · FAO AQUASTAT 2025 · 12 Dec 2025draw more than 75 % of their water for agriculture.
UN News · same reportof cropped area in South Asia is irrigated.
FAO · drought portal · irrigated landof cropped area in Africa is irrigated.
FAO · same pageWater on the plant’s terms.
Irrigation starts because the soil asked, so the field is neither drowned on a wet week nor dry on a hot one.
The dry run caught.
A valve that opened with no flow, or a pipe that burst, shows up as a mismatch between valve and meter, not as a dead crop.
A water record that stands up.
Litres per zone and per season answer the regulator, the landlord and the bank without a search.
Fewer trips.
A valve that can be opened from the office, and a probe that reports on its own, replace a drive to look.
The crop’s stage in the decision.
A seedling and a fruiting plant want different soil; the target moves with the calendar of the crop, not the farm.
Salinity seen building.
Soil conductivity read over weeks shows a problem seasons before yield does.
These are the mechanisms; the size of each depends on the farm, the crop and the water’s price. We don’t publish savings figures.
- 01
Probes and a weather station
One probe per zone, at the root depth, and a station on the farm. The first season is spent watching.
- 02
The flow meter
At the pump, so run time becomes litres.
- 03
Valve control
From the office, once the readings are trusted.
- 04
Rules and schedules
Set against a year of soil data; only then do they make sense.
Which radio and which device, for each step: the decision table →
Where we come in
Forty minutes, free, about your fields.
You leave with the five questions answered for one site and our view, in writing, on whether an assessment is worth doing. If you ask, you see the platform running; if you don’t, you won’t. Chirp Technologies advises growers on this — which probes, which radio for a farm with no cable, how to keep the water record, the order to go in — and built HOLOIN, which runs on your own servers, for farms that want soil, weather, valves and water in one place.