Table 2.
Quadratic relationship between ginseng seedling root dry weight (Y) and light received (X) in three greenhouse experiments
| Expt. no. | Equation | Optimal value |
R2 (p) | |
|---|---|---|---|---|
| Root weight (mg) |
Light (%) |
|||
| 1 | Y = 126.2 + 13.4X – 0.15X2 | 415 | 43.2 | 0.98 (0.01) |
| 2 | Y = 29.5 + 10.9X – 0.17X2 | 200 | 31.4 | 0.87 (0.047) |
| 3 | Y = 95.5 + 4.2X – 0.07X2 | 160 | 30.6 | 0.99 (0.0001) |
| 2 + 3 | Y = 77.9 + 5.5X – 0.07X2 | 181 | 37.4 | 0.70 (0.001) |
| Overall means | 239 | 35.6 | 0.88 | |
| Means for Expts. 2 and 3 and their combination (2 + 3) | 180 | 33.1 | ||
The optimal root weight (mg) and light (%) are calculated from the quadratic equation.
Expt., experiment.