Table 2.
Percentage of the total sum of squares for the effects of variety (V), salinity (S), and their interaction (V × S) for the substrate electrical conductivity and plant growth parameters of four Phaseolus varieties grown at four salinity levels (0, 50, 100, and 150 mM of added NaCl to the medium solution). For the S and V × S sources of variation, the sum of squares has been decomposed in the linear, quadratic, and cubic components.
| Source of Variation | Degrees of Freedom | Electrical Conductivity (dS·m−1) | Stem Length (%) | Number of Leaves | Fresh Weight (%) | Water Content (%) |
|---|---|---|---|---|---|---|
| Variety (V) | 3 | 0.84 ns | 19.48 **** | 17.73 *** | 3.22 **** | 16.24 **** |
| Salinity (S) | 3 | 88.78 **** | 59.21 **** | 64.77 *** | 92.55 **** | 17.33 **** |
| Linear | 1 | 87.64 **** | 57.52 **** | 61.33 *** | 88.32 **** | 10.85 **** |
| Quadratic | 1 | 0.56 * | 0.01 ns | 1.95 *** | 1.55 **** | 5.80 *** |
| Cubic | 1 | 0.59 * | 1.67 ** | 1.49 ** | 2.68 **** | 0.68 ns |
| V × S | 9 | 1.77 ns | 11.76 **** | 8.42 *** | 2.80 **** | 42.15 **** |
| Linear | 3 | – | 8.80 **** | 2.96 *** | 1.62 **** | 23.15 **** |
| Quadratic | 3 | – | 2.60 ** | 2.86 *** | 0.32 ** | 16.78 **** |
| Cubic | 3 | – | 0.36 ns | 2.60 ** | 0.86 **** | 2.22 ns |
| Residual | 64 | 8.61 | 9.55 | 9.08 | 1.42 | 24.28 |
ns, *, **, ***, **** indicate non-significant or significant at p < 0.05, p < 0.01, p < 0.001, or p < 0.0001, respectively.