Table 2.
Effects of plant-derived protein hydrolysate applications on dry weight of shoots, roots and total biomass, SPAD index, and leaf nitrogen content of tomato plants.
| Protein hydrolysate (ml L-1) | Dry biomass (g/plant) |
SPAD | Leaf N content (g/kg) | ||
|---|---|---|---|---|---|
| Shoot | Root | Total | |||
| 0 | 4.85 b | 0.71 b | 5.56 b | 39.0 b | 25.4 b |
| 5 | 5.52 a | 0.92 a | 6.44 a | 44.3 a | 30.1 a |
| 10 | 6.07 a | 0.89 a | 6.96 a | 45.2 a | 31.6 a |
| Significance | ** | ** | ** | * | ** |
*,** significant at P ≤ 0.05, and 0.01, respectively. Different letters within each column indicate significant differences according to Duncan’s multiple-range test (P = 0.05).