Table 2.
Rhizosphere pH and rhizosphere-enzymatic activities of cellulase, peptidase and phosphatases as affected by MCP inoculation on soil 1 (sandy-loam, pH 6.1 PCAL 7 mg kg−1 soil) and soil 2 (clay-loam, pH 5.9, PCAL 20 mg kg−1 soil) receiving N fertilization in form of Ca-nitrate (NO3−) or DMPP-stabilized ammonium (NH4+) and a moderate soluble P supply (30 mg P kg−1). Data represent means and SD of five replicates. A one-way ANOVA with Tukey test was performed for data comparison. Different letters indicate significant differences between treatments (p < 0.05). * indicates a significant difference between MCP inoculated (with MCP) and non-inoculated (no MCP) plants within the same N fertilizer treatments (Tukey test at p < 0.05).
| MCP Treatments | Soil 1 | Soil 2 | |||
|---|---|---|---|---|---|
| NO3− | NH4+ | NO3− | NH4+ | ||
| no MCP | 5.11 ± 0.1 a | 4.60 b ± 0.1 | 5.79 ± 0.02 a | 5.35 ± 0.04 b | |
| With MCP | 5.42 ± 0.4 a | 5.11 ± 0.2 a | 5.79 ± 0.01 a | 5.32 ± 0.06 b | |
| Rhizosphere Enzymatic Activities [nmol g−1 soil h−1] | |||||
| Peptidase | no MCP | 42.01 ± 10.9 | 36.34 ± 6.2 | 160.28 ± 12.2 | 140.81 ± 6.6 |
| with MCP | 47.92 ± 0.3 | 49.54 ± 1.6 * | 142.60 ± 6.8 | 144.42 ± 11.9 | |
| Cellulase | no MCP | 8.49 ± 0.9 | 7.67 ± 0.7 | 51.34 ± 5.5 | 52.28 ± 4.2 |
| with MCP | 9.74 ± 1.0 | 8.15 ± 1.1 | 52.10 ± 1.1 | 48.19 ± 6.6 | |
| Acid Phosphatase | no MCP | 111.76 ± 7.1 | 131.78 ± 22.2 | 964.96 ± 128.1 | 891.49 ± 28.0 |
| with MCP | 125.62 ± 4.3 * | 182.89 ± 19.5 * | 948.89 ± 45.2 | 934.45 ± 125.2 | |
| Alkaline Phosphatase | no MCP | 12.45 ± 3.6 | 7.0 ± 0.5 | 122.56 ± 18.8 | 113.96 ± 17.2 |
| with MCP | 13.15 ± 2.3 | 8.98 ± 1.1 * | 113.66 ± 17.3 | 127.16 ± 23.4 | |