Glossary
Plant water stress indicators and their applicability in precision irrigation

Abscisic acid; Acide abscissique

A substance produced by plants that acts like a plant hormone, and is involved in plant adaptation to stress conditions, as well as in seed development.

Evapotranspiration potentielle (ETP); Potential evapotranspiration

Quantity of water that would be evaporated and transpired by a healthy, well-nourished crop, completely covering the soil and having sufficient water available.

Flux de sève brute; Raw sap flow

Raw sap compensates for water lost through leaf transpiration. If this compensation is insufficient, water reserves in the leaves or underlying tissues are used.

Longueur d'onde reflétée ; Reflected wavelength

In the event of water stress, the light spectrum returned by the plant contains more red (800 nm) than an unstressed plant.

Microclimate

Climatic environment immediately close to plants.