Table 5.
Soil microbial CO2 respiration (μg C-CO2 g-1 dry soil/7 days) after 7 days of incubation and nitrogen (μg N g-1 dry soil) content of soils sampled under uninoculated and inoculated 13-year-old S. senegal trees during dry and rainy season of the 2 years.
| Treatments | First year |
Second year |
||||||
|---|---|---|---|---|---|---|---|---|
| Dry season April |
Rainy season August |
Dry season April |
Rainy season August |
|||||
| C-CO2 | NH4+ + NO3- | C-CO2 | NH4+ + NO3- | C-CO2 | NH4+ + NO3- | C-CO2 | NH4+ + NO3- | |
| Uninoculated trees | ∗51.9 ± 1.3a | 9.1 ± 1.1a | 31.1 ± 0.4a | 3.7 ± 0.8a | 64.7 ± 3.8a | 9.7 ± 0.4a | 51.4 ± 4.5b | 5.1 ± 0.3a |
| Inoculated trees | ∗45.4 ± 5.8a | 12.8 ± 2.9a | 30.6 ± 1.5a | 2.4 ± 1.4a | 68.2 ± 4.9a | 9.1 ± 0.7a | 32.2 ± 1.8a | 5.8 ± 0.7a |
Values within a column sharing same letter comparing rhizobial inoculation treatment are not significantly different at P < 0.05 (Student–Newman–Keuls test). Each value represents the mean of 12 repetitions (six in each block).
∗These values were obtained before inoculation.