sap flow sensors

Sap flow sensors measure transpiration flow as the ascent of sap within xylem tissue; measurements can be made in stems, trunks, branches, or tillers. Given that transpiration is sensitive to plant water status, with the effect being mediated by stomatal opening, sap flow can be used as an indicator of plant water status.

for more information

https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/sap-flow

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