Table 3. Models obtained with the significance level and statistical parameters for the determined parameters in the growing media and in the seedlings of tomato, melon and lettuce.
| Parameter | Model | Pvalue | Equation | R2 | Pred. R2 |
|---|---|---|---|---|---|
| Substrate pH | Linear | < 0.0001 | pH = 7.94GC + 5.94PF + 4.21SP | 0.9433 | 0.8704 |
| Substrate EC | Linear | 0.0013 | (EC)2 = 13.05GC + 1.85PF + 0.25SP | 0.8499 | 0.6959 |
| Substrate BD | Quadratic | < 0.0001 | BD = 0.34GC + 0.075PF + 0.13SP—0.056GC·PF—0.096GC·SP + 0.099PF·SP | 0.9979 | 0.9625 |
| Substrate TPS | Linear | 0.0165 | TPS = 70.17GC + 80.55PF + 67.05SP | 0.6904 | 0.2357 |
| Substrate AV | Quadratic | 0.0010 | (AC)2 = 12.34GC + 1.46PF + 65.84SP + 214.2GC·PF—4.5GC-113.4PF·SP | 0.9850 | 0.7178 |
| Substrate AW | Special cubic | 0.0062 | (AW)-1.5 = -0.014GC + 0.011PF + 0.033SP—3.98·10-3GC·PF + 4.23GC·SP + 1.51PF·SP—17.01GC·PF·SP | 0.9873 | 0.5374 |
| Substrate EAW | Special cubic | 0.0153 | (EAW)-0.5 = 0.35GC + 0.16PF + 0.16SP + 0.46GC·PF + 13.44GC·SP + 4.38PF·SP—51.97GC·PF·SP | 0.9765 | 0.2519 |
| Tomato-H | Linear | 0.0169 | (H)2 = 0.0392GC + 6.657·10-3PF—6.575·10-4SP | 0.7435 | 0.5172 |
| Tomato-NL | Quadratic | 0.0022 | NL = -0.16GC + 3.68PF + 3.73SP + 11.74GC·PF + 7.20GC·SP + 1.44PF·SP | 0.9991 | 0.9499 |
| Tomato-D | Quadratic | 0.0144 | D = -1.11·10-3GC + 3.60·10-3PF + 3.52·10-3SP + 1.04·10-4GC·PF + 1.16·10-4GC·SP + 2.96·10-5PF·SP | 0.9733 | 0.6052 |
| Tomato-FW | Quadratic | 0.0045 | 1/FW = 2.62GC + 0.57PF + 0.76SP—4.25GC·PF—4.66GC·SP—1.09PF·SP | 0.9879 | 0.7729 |
| Tomato-DW | Quadratic | 0.0008 | 1/DW = 28.11GC + 4.24PF + 6.40SP -38.59GC·PF—45.12GC·SP—10.45PF·SP | 0.9961 | 0.9355 |
| Tomato-SPAD | Quadratic | 0.0040 | 1/SPAD = 0,053GC + 0.078PF + 0.039SP—0.149GC·PF—0.036GC·SP—0.088PF·SP | 0.9889 | 0.7782 |
| Melon-H | Quadratic | 0.0061 | (H)-2 = 0.034GC + 0.016PF + 0.054SP—0.067GC·PF—0.077GC·SP—0.083PF·SP | 0.9851 | 0.7772 |
| Melon-NL | Quadratic | 0.0015 | (NL)-3 = 0.17GC + 0.043PF + 0.099SP—0.24GC·PF—0.32GC·SP—0.098PF·SP | 0.9814 | 0.6299 |
| Melon-FW | Special cubic | 0.0083 | (FW)-3 = 0.20GC + 0.029PF—0.09SP—0.41GC·PF + 0.26GC·SP + 0.39PF·SP—1.67GC·PF·SP | 0.9972 | 0.8261 |
| Melon-DW | Linear | 0.0219 | 1/DW = 4.49GC + 1.57PF + 5.90SP | 0.7203 | 0.3587 |
| Melon-SPAD | Quadratic | 0.0038 | 1/(SPAD+15) = 0.025GC +0.045PF + 0.030SP—0.043GC·PF + 6.83·10-3GC·SP—0.051PF·SP | 0.9701 | 0.7160 |
| Lettuce-NL | Linear | 0.0377 | (L)-2 = 0.047GC + 1.09PF + 0.026SP | 0.6646 | 0.1330 |
| Lettuce-FW | Quadratic | 0.0021 | (FW)-3 = 5.23GC + 2.15PF + 1.81SP—12.84GC·PF—8.16GC·SP—7.78PF·SP | 0.9778 | 0.5669 |
| Lettuce-DW | Quadratic | 0.0009 | (L)-3 = 5565GC + 783PF + 1496SP—11498GC·PF—10599GC·SP—3731PF·SP | 0.9855 | 0.7429 |
| Lettuce-SPAD | Linear | 0.0248 | SPAD = 28.2GC + 19.3PF + 29.5SP | 0.7084 | 0.2224 |
| Lettuce-LAI | Linear | 0.0065 | (LAI)-1 = 2.71·10-3GC + 5.12·10-3PF + 2.98·10-3SP | 0.7629 | 0.4546 |
H: total length; D: stem diameter; SPAD: foliar chlorophyll values; NL: leaves number; LA: leaves area; LAI: leaf area index; FW: fresh weight of seedlings; DW: dry weight of seedlings. For other abbreviations, see Table 2.
R2: R-squared; Pred. R2: predicted R-squared.