Table 1.
Impact of different inorganic-N fertigation schemes and rhizobia inoculants on the growth and nodulation capacity of the common bean (Phaseolus vulgaris L.).
| Treatments | Vegetative Stage | Flowering Stage | First-Pod Emergence | ||||
|---|---|---|---|---|---|---|---|
| N | Strain | Shoot FW (g) | Nodules (N° Plant−1) | Shoot FW (g) | Nodules (N° Plant−1) |
Shoot FW (g) | Nodules (N° Plant−1) |
| Main effects | |||||||
| 100% | 65.1 | 18.4 | 102.8 | 30.7 | 148.8 a | 23.4 | |
| 75–25% | 59.5 | 30.6 | 96.4 | 55.2 | 141.3 ab | 62.7 | |
| 50–25% | 68.1 | 73.6 | 104.4 | 89.6 | 135.3 b | 97.9 | |
| No inoc. | 63.4 | 4.9 | 94.3 | 11.2 | 136.5 | 22.8 | |
| PVTN21 | 64.8 | 87.4 | 110.1 | 105.1 | 146.7 | 107.7 | |
| CIAT 899 | 64.5 | 30.2 | 99.2 | 59.1 | 142.2 | 47.9 | |
| Interactions | |||||||
| 100% | Non inoc. | 69.4 | 0 d | 108.2 | 8 c | 145.7 | 13 d |
| PVTN21 | 64.2 | 46 bc | 111.0 | 64.3 b | 149.5 | 40 d | |
| CIAT 899 | 61.6 | 9.3 cd | 89.2 | 26 c | 151.3 | 17.3 d | |
| 75–25% | Non inoc. | 55.2 | 0 d | 87.0 | 12.7 c | 133.8 | 22.3 d |
| PVTN21 | 59.3 | 71.7 b | 99.1 | 91.7 b | 142.4 | 115.7 b | |
| CIAT 900 | 64.1 | 20 cd | 103.0 | 61.3 b | 147.6 | 50 cd | |
| 50–25% | Non inoc. | 65.8 | 14.7 cd | 87.7 | 19.3 c | 130.2 | 39.7 cd |
| PVTN21 | 70.9 | 144.7 a | 120.3 | 159.3 a | 148.2 | 167.3 a | |
| CIAT 901 | 67.6 | 61.3 b | 105.4 | 90 b | 127.6 | 86.7 bc | |
| Statistical Significance | |||||||
| Nitrogen | ns | *** | ns | *** | * | *** | |
| Strain | ns | *** | ns | *** | ns | *** | |
| Nitrogen*Strain | ns | * | ns | * | ns | * | |
Mean values (n = 6) followed by different letters within the same column indicate significant differences according to Duncan’s multiple range test (p < 0.05): *** and * significant at p < 0.001 and p < 0.05, respectively; ns = not significant. FW denotes fresh weight.