Sigrow Help Portal
Sigrow Help Portal
App release v3.8.4

App release v3.8.4

Release on: 13-03-2026

  • New Features
  • Transpiration Module
  • User configuration
  • Output of Module
  • View output on Charts
  • Updates/Bug fixes:

New Features

Transpiration Module

Transpiration and stomatal conductance are key indicators for greenhouse growers. They describe how actively plants are exchanging water and energy with their environment.

  • Transpiration is the flux of water vapor from the leaves into the greenhouse air. It reflects how much water plants are losing through evaporation.
      • El=(rad−Q)⋅36002500⋅1000⋅1000[g m−2 h−1]E_l = \frac{(rad - Q)\cdot 3600}{2500 \cdot 1000} \cdot 1000 \quad [g\, m^{-2}\, h^{-1}]El​=2500⋅1000(rad−Q)⋅3600​⋅1000[gm−2h−1]Q=2⋅LAI⋅(Tair−Tleaf)⋅(5+3.5⋅Vair)Q = 2 \cdot LAI \cdot (T_{air} - T_{leaf}) \cdot (5 + 3.5 \cdot V_{air})Q=2⋅LAI⋅(Tair​−Tleaf​)⋅(5+3.5⋅Vair​)
    1. Variables:
      • rad: radiation (W m^-2)
      • T_air: air temperature (°C)
      • T_leaf: leaf temperature (°C)
      • V_air: air velocity (m s^-1). Assumption applied: 1/1000 m/s
      • LAI: leaf area index. Assumption applied: 3
  • Stomatal conductance is a measure of how open or closed the stomata are. Open stomata allow gas exchange (CO₂ uptake, water release), while closed stomata limit both.
      • Gs=ElVPDleaf[g m−2 h−1 kPa−1]G_s = \frac{E_l}{VPD_{leaf}} \quad [g\, m^{-2}\, h^{-1}\, kPa^{-1}]Gs​=VPDleaf​El​​[gm−2h−1kPa−1]
    1. Variables:
      • VPD_leaf: vapor pressure deficit (kPa)

User configuration

The following options are required for configuration

  1. Set the name of transpiration setting
  2. Air temperature source - Select one or more devices that measure Air temperature
  3. Leaf temperature source - Select Camera and choose either camera points or AI recognition
  4. Radiation source - Select NetRadiometer device at location
  5. Save configuration settings
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Output of Module

With the above inputs, the module will calculate:

  • Daily and real-time transpiration values -   g/m²/h
  • Stomatal conductance estimates -  g/m²/h/kPa (based on energy balance and leaf-air temperature difference)
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Both transpiration and stomatal conductance models can be viewed on the standard Charts page once configured

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View output on Charts

Once configured and saved, the transpiration and stomata conductance estimates can be viewed on the Charts page.

They appear as standard variables.

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To select the specific transpiration configuration - click the transpiration config icon and select the saved configuration from the dropdown.

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Updates/Bug fixes:

This release included some bug fixes and updates to improve your experience

  • Update - ⁠⁠Improved Zoom for charts. When zoomed in on charts - fixed issue where view would reset once a new variable or device is selected.
  • Bug fix - Fixed redirect issue for user password resetting