Table 3.
Effects of different rates of essential oil (E0: No essential oil; E1: essential oil (100 mg kg−1), E2: essential oil (1000 mg kg−1)) and different Rhizobium inocula (R0: No Inoculation, R1: Rhizobium leguminosarum biovar phaseoli F7, R2: Rhizobium leguminosarum biovar phaseoli F83, R3: Rhizobium leguminosarum biovar phaseoli Ciat899) on nodules, plant height, total plant biomass and plant N content.
| Treatments | Plant parameters of Phaseolus vulgaris L. | ||||
|---|---|---|---|---|---|
| Inoculation | Essential Oil | Nodules | Plant height (cm) | Total plant biomass (g DW) | Plant N content (g kg−1) |
| No inoculation (R0) | E0 | 0 ± 0.0 a | 35.3 ± 1.5 | 2.96 ± 0.6 | 1.70 ± 0.5 |
| E1 | 0 ± 0.0 a | 34.3 ± 1.5 | 2.87 ± 0.4 | 1.80 ± 1.1 | |
| E2 | 0 ± 0.0 a | 27.0 ± 2.0 | 2.78 ± 0.7 | 1.98 ± 0.5 | |
| R1 | E0 | 22.7 ± 6.6 a | 36.3 ± 9.5 a | 3.31 ± 0.8 | 2.24 ± 0.8 |
| E1 | 36.7 ± 9.0 b | 28.3 ± 1.5 b | 3.22 ± 0.9 | 2.42 ± 0.5 | |
| E2 | 29.0 ± 1.7 ab | 39.0 ± 9.2 a | 3.39 ± 0.7 | 2.49 ± 1.4 | |
| R2 | E0 | 48.3 ± 2.8 a | 31.0 ± 10.5a | 3.81 ± 0.8 | 1.66 ± 0.8 |
| E1 | 40.7 ± 9.3 b | 26.0 ± 3.6 b | 3.63 ± 0.8 | 2.17 ± 0.9 | |
| E2 | 44.0 ± 3.6 ab | 35.0 ± 7.5 a | 3.49 ± 1.7 | 2.69 ± 1.4 | |
| R3 | E0 | 46.3 ± 2.9 a | 48.0 ± 1.0 a | 3.94 ± 1.0 | 2.58 ± 1.0 |
| E1 | 54.0 ± 3.0 b | 42.0 ± 6.2 b | 3.89 ± 0.9 | 2.45 ± 1.3 | |
| E2 | 51.0 ± 1.00 ab | 47.0 ± 2.6 a | 3.54 ± 0.9 | 3.05 ± 1.7 | |
Different letters indicate significant differences followed by Tukey post- hoc test considering essential oil application for each inoculation treatment. Values are given as an average for n = 3 on a dry weight basis ± standard deviation.