How to set up and use the Delta-T Devices AP4 Leaf Porometer

This video gives a thorough overview of the AP4 Porometer by Technical Sales Specialist Tony Peloe. The AP4 measures stomatal aperture in terms of leaf conductance to water vapour. This is a major determinant of water loss from plant leaves and of CO2 uptake in photosynthesis. The AP4 is an invaluable tool for quantifying the effect of various influences on stomatal behaviour. It also has an important role to play in comparing the performance of different crop varieties in response to environmental variations and stresses. Key features of the AP4 Porometer include an automated, rapid cycle that gives temperature compensated readings, and rapid six-point field calibration – ensuring consistent and accurate results under changeable conditions.