A heat spell is coming
Temperatures reach 39 °C within three days. Move watering to the evening and skip midday spraying — leaf scorch risk is high.
Sunday, 2 August 2026Tire Plain · Tomatoeslogged 08:15SAMPLE ENTRY
TONIGHT, IN THE EVENING COOL
Water the field.
~62 mm · after sundown · drip
Available moisture is down to 48%; the crop draws comfortably above 60%. The root-zone deficit is 73 mm and no rain is due for 48 hours. Watering in the evening cool cuts evaporation losses.
WHAT IT SAW
Today's measurements — from the weather service and the water balance.
Weather37 °C
Low 21 °C · no rain due in 48 hours.
Available moisture48%
Threshold 60%. Falling for three days.
WATCHWater deficit73 mm
Comfortable limit 56 mm, total capacity 140 mm.
Field12 da
Tomatoes · loam soil · drip irrigation
WHAT IT SAYS
Today's order is above. What comes next, and the warnings:
The harvest window is opening
74 days since planting, against a growing season of about 145 days. Plan the last watering and your sale dates now.
WHAT CAME OF IT
Your work builds up here — it corrects the next calculation.
1 August62 mm
Watering
29 July58 mm
Watering
24 July—
Foliar feed
THE ARITHMETIC IS OPEN
Kahya's decision is a calculation, not a hunch. The advice above came out of these four numbers; every one of them is on the record.
- 01What the soil holds140 mm
Loam soil, 90 cm rooting depth for tomatoes.
- 02What the crop draws easily56 mm
Past this limit the plant starts to struggle.
- 03Today's deficit73 mm
Water evaporated since the last irrigation, minus rain.
- 04Water to apply62 mm
With drip irrigation's losses accounted for.
The deficit (73 mm) passed the limit (56 mm) — that is why today says water. Had it not, it would say the water is holding.
WHAT IT RESTS ON
No invented score, and no "the AI said so".
FAO-56 water balance
The irrigation decision comes from the soil-water accounting used as the standard worldwide: daily crop water use by growth stage, the soil's holding capacity, rain and irrigation.
Hourly weather data
Temperature, rainfall and evaporation are pulled for your field's coordinates. The seven-day forecast counts too — if rain is due tomorrow, it doesn't tell you to water today.
Sensors are optional
If you have a soil moisture sensor, its reading overrides the calculation. Without one the system still works; you can start without buying hardware.
AI doesn't decide
Rules decide, AI only explains. Bad irrigation advice costs money; in this field being auditable is the point.
WHAT IT ASKS OF YOU
Setup takes two minutes. No device, no cabling, no installation crew.
- 01
Where the field is
Standing in the field, your phone's location is enough.
- 02
Crop and planting date
The growth stage is worked out from this.
- 03
Soil type
Sandy, loam or clay — the holding capacity follows from it.
- 04
Last watering
The starting point of the calculation. If you don't know, the system corrects itself within days.