Table 3.
Estimates of parameters (± SE) for polynomial and linear regression for shoot and root dry wt (mg) and shoot:root (S:R) dry wt ratio for basil, lettuce and parsley plants treated with different quantities of HexaFrass™ (HF). Polynomial regressions were of the form y = a + b (HF) + c (HF2). Linear equations were of the form y = a + b (HF). HFMax is the point estimate of HF calculated as −b/2c when the maximum value (Max) of each response variable would be obtained (see Figure 1 and Figure 2 for graphs).
| Plant | Potting Mix | y | a | b | c | HFMax | Max |
|---|---|---|---|---|---|---|---|
| Basil | Low | Shoot | 7.9 ± 45.9 | 175.1 ± 32.5 | −14.8 ± 3.8 | 5.92 | 525.8 |
| Low | Root | 17.5 ± 11.3 | 49.6 ± 8.0 | −5.2 ± 0.9 | 4.77 | 135.8 | |
| Low | S:R | 1.76 ± 0.24 | 0.51 ± 0.06 | − | − | − | |
| High | Shoot | 101.4 ± 72.3 | 230.9 ± 51.2 | −15.8 ± 6.0 | 7.31 | 945.0 | |
| High | Root | 47.1 ± 16.8 | 45.8 ± 11.9 | −4.6 ± 1.4 | 4.98 | 161.1 | |
| High | S:R | 2.36 ± 0.27 | 0.70 ± 0.07 | − | − | − | |
| Lettuce | Low | Shoot | −23.9 ± 30.1 | 244.8 ± 21.3 | −23.5 ± 2.5 | 5.21 | 613.6 |
| Low | Root | 25.5 ± 9.8 | 59.4 ± 6.79 | −7.1 ± 0.8 | 4.18 | 149.7 | |
| Low | S:R | 0.94 ± 0.39 | 0.98 ± 0.09 | − | − | − | |
| High | Shoot | 136.9 ± 40.3 | 181.0 ± 28.5 | −14.3 ± 3.3 | 6.33 | 709.6 | |
| High | Root | 72.4 ± 16.6 | 38.6 ± 11.8 | −4.0 ± 1.4 | 4.83 | 165.5 | |
| High | S:R | 1.79 ± 0.27 | 0.88 ± 0.19 | −0.06 ± 0.02 | − | − | |
| Parsley | Low | Shoot | 37.9 ± 11.4 | − | − | − | − |
| Low | Root | −2.4 ± 5.0 | 15.2 ± 4.8 | −1.6 ± 0.6 | 4.75 | 33.7 | |
| Low | S:R | 6.1 ± 1.5 | − | − | − | − | |
| High | Shoot | 16.6 ± 44.9 | 203.3 ± 31.9 | −18.6 ± 3.81 | 5.47 | 572.1 | |
| High | Root | 23.6 ± 12.4 | 42.9 ± 8.6 | −4.4 ± 1.0 | 4.88 | 128.2 | |
| High | S:R | 1.54 ± 0.30 | 1.27 ± 0.21 | −0.10 ± 0.02 | − | − |