There is a signal the plant emits continuously, silently, and ahead of the eye: the diameter of its trunk. It is not a fixed value. Over the course of a day, the trunk contracts when transpiration outpaces water uptake, and recovers at night as the plant rehydrates. That cycle of micro-variations — thousandths of a millimeter — is a direct mirror of the crop’s water status.
Dendrometry is the discipline that measures that pulse. With precision sensors mounted on the trunk or the fruit, its expansion and contraction are recorded continuously, day and night, with no one needing to be in the field.
What growth hides
A well-hydrated crop has a recognizable daily pattern: it contracts during peak-demand hours and grows net over the season. When water stress sets in, that pattern changes before the leaf wilts or the fruit suffers: the daily contraction deepens, the nightly recovery shortens, net growth stalls.
That change is measurable hours or days ahead of any visible symptom. And it is quantitative: it is not "the plant looks stressed," it is a curve deviating from its baseline.
Precision irrigation, not calendar irrigation
The practical consequence is enormous. Most irrigation plans are run by calendar or by feel. Dendrometry lets you move to plant-guided irrigation: watering when the plant asks for it, in the amount it needs, without wasting water or forcing stress.
In a context where water is increasingly expensive and limited, fine-tuning irrigation is not just agronomy: it is economics and sustainability. The 10–20% water savings achieved by combining satellite and field data come, in large part, from deciding irrigation with evidence rather than intuition.
One more signal for the engine
Dendrometry shines especially as part of a system. On its own it tells you the plant’s water balance. Crossed with soil analysis, sap analysis and satellite monitoring, it becomes one of the signals feeding the decision engine:
- The satellite sees vigor and its spatial variability.
- The lab sees soil and plant chemistry.
- Dendrometry sees the water pulse, minute by minute.
A model that fuses those sources doesn’t just detect that something is happening: it understands why and recommends when to intervene. The plant was already warning you. Now, at last, someone is listening — continuously.