Table 2.
Net CO2 assimilation rate (ACO2), transpiration (E), water use efficiency (WUE), and chlorophyll fluorescence (Fv/Fm) of basil under untreated control, copper sulfate (Cu), copper complexed with amino acids and peptides (Cu-VPH), vegetal protein hydrolysate (VPH), and Cu-VPH enriched with VPH (VPH+Cu-VPH) treatments.
| Treatments | ACO2 | E | WUEi | Fluorescence Fv/Fm |
|---|---|---|---|---|
| μmol CO2 m−2 s−1 | mol H2O m−2 s−1 | μmol CO2 mol−1 H2O | ||
| Control | 11.15 ± 0.11 b | 1.66 ± 0.04 c | 6.72 ± 0.12 a | 0.76 ± 0.00 d |
| Cu | 11.96 ± 0.13 b | 2.18 ± 0.18 b | 5.57 ± 0.45 bc | 0.77 ± 0.00 c |
| Cu-VPH | 12.19 ± 0.13 b | 2.59 ± 0.04 a | 4.71 ± 0.10 c | 0.78 ± 0.00 b |
| VPH+Cu-VPH | 14.38 ± 0.45 a | 2.36 ± 0.03 ab | 6.09 ± 0.12 ab | 0.81 ± 0.00 a |
| VPH | 12.14 ± 0.19 b | 2.00 ± 0.02 bc | 6.07 ± 0.15 ab | 0.77 ± 0.00 c |
| Significance | *** | *** | *** | *** |
*** significant at p ≤ 0.001. Different letters within each column indicate significant differences according to Tukey HSD test (p = 0.05). All data are expressed as mean ± standard error, n = 3.