Use Turgor Pressure Estimate when you need to estimate turgor pressure in megapascals as the total water potential minus the osmotic potential, floored at zero when the cell is flaccid; both potentials are signed and finite. Enter Total water potential and Osmotic potential using the definitions and units below so the result can be reproduced.

Total water potential

Total (whole-cell) water potential in megapascals.

Osmotic potential

Osmotic (solute) potential in megapascals.

The published tool contract uses this rule: Estimate turgor pressure in megapascals as the total water potential minus the osmotic potential, floored at zero when the cell is flaccid; both potentials are signed and finite.

Turgor pressure

Estimated turgor pressure in megapascals; never negative.

The output is an estimate tied to the stated model and coefficients; it is not a direct measurement and should retain that label when reported.

Retain the original Total water potential and Osmotic potential values and their units alongside the result. Pressure Potential is useful when you instead need to compute the pressure (turgor) potential in megapascals as the total water potential minus the osmotic potential; both inputs are signed. Stomatal Conductance Estimate provides another view by helping you estimate stomatal conductance in moles per square metre per second from transpiration and vapour pressure deficit.

• Pressure Potential

  Compute the pressure (turgor) potential in megapascals as the total water potential minus the osmotic potential; both inputs are signed.

• Stomatal Conductance Estimate

  Estimate stomatal conductance in moles per square metre per second from transpiration and vapour pressure deficit.

• Leaf VPD From RH

  Compute the leaf vapour pressure deficit in kilopascals from leaf temperature using the Tetens equation for saturation vapour pressure, 0.6108 times e^(17.27 times temperature divided by temperature plus 237.3), scaled by one minus relative humidity over one hundred.