Use this plant measurement when samples, dry- or fresh-mass basis, image threshold, geometry, instrument calibration, and treatment timing follow one consistent protocol.

Control ratio

Control conductivity ratio between 0 and 1.

Treated ratio

Treated conductivity ratio between 0 and 1; must be greater than zero.

The implementation follows this calculation rule: Compute cell membrane stability as a percentage by comparing the control conductivity ratio to the treated conductivity ratio, control divided by treated times one hundred, clamped to the range zero through one hundred.

Cell membrane stability

Cell membrane stability percentage clamped to 0 through 100.

Pigment proxies, canopy metrics, tissue density, and leakage indices are method-dependent. Species, developmental stage, hydration, illumination, extraction efficiency, sensor angle, and environmental conditions can confound comparisons. Ratios and percentages become unstable when their denominator is small, uncertain, or defined differently between samples.

Pair the proxy with calibrated chemical analysis, destructive biomass sampling, or repeated field measurements where practical. Report environmental conditions and whether values use fresh mass, dry mass, area, or volume.

• MSI Percent

  Compute membrane stability as one minus the ratio of initial to boiled conductivity times 100, requiring a positive boiled conductivity and an initial conductivity that does not exceed it.

• Drought Tolerance Index

  Compute the drought tolerance index as stressed yield divided by control yield times one hundred.

• Leakage Two Step

  Compute the electrolyte leakage ratio as the initial conductivity divided by the maximum conductivity measured after a second boil; the result is a fraction between zero and one.