Table 6.
Effect of phosphorus (P) source, P level, and addition of phosphate-solubilizing bacteria (PSB) on soil pH and soil content of organic matter (OM) content, P, nitrogen (N) and potassium (K) after harvest of mungbean.
| Treatments | Soil pH | Soil organic matter (%) | Soil P (mg kg−1) | Soil N (%) | Soil K (mg kg−1) |
|---|---|---|---|---|---|
| Control | 7.74 | 0.61 | 2.07 | 0.04 | 100.27 |
| All treatments | 7.68 | 0.70 | 3.44 | 0.09 | 129.45 |
| Significance level | ns | Ns | ∗∗ | ∗∗ | ∗∗ |
| P source (PS): | |||||
| Single super phosphate | 7.67b† | 0.74a | 3.66a | 0.10 | 121.40b |
| Rock phosphate | 7.92a | 0.59b | 3.09b | 0.09 | 143.56a |
| Significance level | ∗∗ | ∗∗ | ∗∗ | ns | ∗∗ |
| P level (PL): | |||||
| 45 kg ha−1 | 7.68b | 0.58b | 2.80b | 0.09b | 129.58b |
| 90 kg ha−1 | 7.91a | 0.75a | 3.94a | 0.11a | 135.37a |
| Significance level | ∗∗ | ∗∗ | ∗∗ | ∗ | ∗∗ |
| PSB addition: | |||||
| Without PSB | 7.84 | 0.78a | 3.07b | 0.08b | 128.01b |
| With PSB | 7.75 | 0.54b | 3.67a | 0.12a | 136.95a |
| Significance level | ns | ∗∗ | ∗∗ | ∗∗ | ∗∗ |
| Interactions: | significance level | ||||
| PS x PL | ∗∗ | ∗∗ | ∗∗ | ns | ns |
| PS x PSB | ∗ | ∗∗ | ∗∗ | ns | ∗∗ |
| PL x PSB | ns | ∗∗ | ∗∗ | ns | ns |
| PS x PL x PSB | ∗∗ | ∗∗ | ∗∗ | ns | ns |
†
Different letters after values indicate statistically significant difference at ∗P < 0.05; ∗∗P < 0.01, ns = non-significant.