Table 2.
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 soil chemical and microbial properties.
| Treatments | Parameters | ||||||
|---|---|---|---|---|---|---|---|
| Inoculation | Essential Oil | Total N (%) |
NO3− (µg N g−1) |
NH4± (µg N g−1) |
Bacterial abundance (CFU g−1) |
Fungal abundance (CFU g−1) |
Basal respiration (µg C g−1 h−1) |
|
No inoculation (R0) |
E0 | 0.19 ± 0.01 | 55.1 ± 18.0 | 15.3 ± 0.6 | 3.34 · 107 ± 8.91 · 106 ab | 5.50 · 106 ± 0.12 · 106 a | 24.9 ± 0.4 a |
| E1 | 0.20 ± 0.01 | 43.3 ± 6.9 | 12.8 ± 3.3 | 3.78 · 107 ± 7.55 · 106 a | 5.53 · 106 ± 3.73 · 106 a | 17.0 ± 3.0 b | |
| E2 | 0.21 ± 0.01 | 34.1 ± 6.3 | 17.0 ± 11.8 | 1.35 · 107 ± 1.38 · 106 b | 3.16 · 106 ± 1.38 · 106 b | 13.7 ± 2.8 b | |
| R1 | E0 | 0.20 ± 0.02 | 46.8 ± 20.5 | 16.6 ± 6.4 | 2.65 · 107 ± 2.38 · 106 a | 6.06 · 106 ± 0.21 · 106 b | 26.5 ± 2.8 a |
| E1 | 0.18 ± 0.06 | 67.6 ± 29.8 | 17.5 ± 4.2 | 0.74 · 107 ± 4.17 · 106 b | 9.73 · 106 ± 4.17 · 106 a | 17.2 ± 3.4 b | |
| E2 | 0.18 ± 0.03 | 60.1 ± 26.1 | 12.7 ± 2.7 | 0.82 · 107 ± 0.71 · 106 b | 4.16 · 106 ± 0.71 · 106 c | 13.3 ± 5.4 b | |
| R2 | E0 | 0.20 ± 0.01 | 42.0 ± 17.5 | 21.0 ± 3.6 | 1.43 · 107 ± 9.37 · 106 a | 3.73 · 106 ± 1.37 · 106 c | 15.5 ± 4.8 a |
| E1 | 0.19 ± 0.02 | 55.6 ± 23.3 | 14.6 ± 1.5 | 0.69 · 107 ± 1.82 · 106 c | 4.63 · 106 ± 1.82 · 106 b | 17.3 ± 1.6 a | |
| E2 | 0.20 ± 0.01 | 43.9 ± 9.4 | 11.5 ± 0.8 | 1.32 · 107 ± 0.53 · 106 b | 16.1 · 106 ± 2.20 · 106 a | 15.4 ± 1.5 a | |
| R3 | E0 | 0.19 ± 0.03 | 48.9 ± 4.0 | 15.7 ± 2.4 | 7.60 · 107 ± 1.83 · 106 a | 7.60 · 106 ± 3.16 · 106 a | 14.5 ± 2.8 b |
| E1 | 0.20 ± 0.02 | 52.1 ± 8.5 | 24.3 ± 11.6 | 2.65 · 107 ± 2.40 · 106 b | 2.65 · 106 ± 1.08 · 106 c | 13.5 ± 1.45 c | |
| E2 | 0.22 ± 0.02 | 34.3 ± 7.1 | 15.7 ± 1.2 | 1.39 · 107 ± 2.19 · 106 c | 5.90 · 106 ± 3.67 · 106 b | 23.7 ± 7.2 a | |
Different letters indicate significant differences followed by Tukey post- hoc test considering essential oil application for each inoculation treatment and interaction. Values are given as an average for n = 3 on a dry weight basis ± standard deviation.