A key measurement approach in plant water relations and status is sap flow or movement of fluid in the water-conducting tissue of the plant, or xylem.
ICT International offers both the Heat Ratio (HRM) and the Heat Field Deformation (HFD) methods of measuring sap flow.
More information on the principles behind the measurement of sap flow can be found on the Sap Flow Measurement knowledge base, and the differences between the models on Which Sap Flow Sensors do I need?
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