Table 3 The heat stress indices used in the study with their mathematical formulas. Yp yield under normal conditions, Ys yield under stress conditions, Xp average yield of all lentil genotypes under normal conditions, Xs average yield of all lentil genotypes under stress conditions.
From: Identification of heat tolerant lentil genotypes through stress tolerance indices
Stress Indices | Method of Calculation | References |
|---|---|---|
The Tolerance Index (TOL) | Yp - Ys | Rosielle and Hamblin34 |
Stress Tolerance Index (STI) | (Yp × Ys)/ Xp2 | Fernandez40 |
Stress susceptibility percentage index (SSPI) | \(\:(\text{Y}\text{p}\:-\:\text{Y}\text{s})/\left(2\text{X}\text{p}\:\right)\:\:\times\:100\) | Moosavi et al.37 |
Yield Index (YI) | Ys/ Xs | Gavuzzi et al.42 |
Yield Stability Index (YSI) | Ys/ Yp | Bouslama and Schapaugh41 |
Relative Stress Index (RSI) | (Ys/ Yp) / (Xs/ Xp) | Fischer and Wood38 |
Mean Productivity (MP) | (Yp + Ys)/2 | Rosielle and Hamblin34 |
Geometric Mean Productivity (GMP) | \(\:\sqrt{(\text{Y}\text{s}\:\times\:\text{Y}\text{p}}\) | Fernandez40 |
Harmonic Mean (HM) | 2(Yp × Ys)/ (Yp + Ys) | Bidinger et al.45 |
Mean relative performance (MRP) | (Ys/ Xs) + (Yp/ Xp) | Ramirez and Kelly36 |
Percent yield Reduction (PYR) | (Yp - Ys)/Yp ×100 | Farshadfar and Javadinia46 |
