Table 3.
Effect of Azospirillum brasilense strains CNPSo 2083 and CNPSo 2084 and of enriched metabolites of R. tropici strain CIAT 899 enriched in LCOs applied to the seeds at sowing or by leaf spray at the V3 stage on plant growth (shoot dry weight, SDW; plant height, PH), shoot N (content [NS] and total N accumulated in shoots [TNS]) at 32 and 42 days after sowing (DAS), and grain parameters (yield, N content in grains [NG] and total N accumulated in grains [TNG]) in maize hybrid DKB- 350-PRÓ
| Treatment | Rio Verde | Maracaí | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 32 DAS | Maturity | 42 DAS | Maturity | |||||||||||
| SDW (g pl−1) | PH (cm) | NS (g kg−1) | TNS (mgN pl−1) | Yield (kg ha−1) | NG (g kg−1) | TNG (mgN pl−1) | SDW (g pl−1) | PH (cm) | N (g kg−1) | TNS (mgN pl−1) | Yield (kg ha−1) | NG (g kg−1) | TNG (mgN pl−1) | |
| Non-inoculated control | 13.0ns | 176ns | 25.27ns | 328ns | 6465ns | 11.77ns | 76 b | 40.3ns | 153ns | 22.49ns | 806 b | 3091 d | 14.13 bc | 44 c |
| Seed inoculated (Azospirillum) | 12.1 | 174 | 26.74 | 324 | 6758 | 11.23 | 76 b | 40.4 | 149 | 23.41 | 946 a | 3486 bc | 15.41 ab | 54 b |
| Seed inoculated (Azospirillum + enriched metabolites) | 11.9 | 175 | 26.81 | 320 | 6769 | 13.93 | 94 a | 40.8 | 151 | 23.35 | 953 a | 3698 ab | 14.41 abc | 53 b |
| Leaf spray inoculation (Azospirillum) | 11.8 | 176 | 28.08 | 331 | 6621 | 11.12 | 74 b | 40.7 | 150 | 23.31 | 948 a | 3278 cd | 13.59 c | 44 c |
| Leaf spray inoculation (Azospirillum
+ enriched metabolites) |
11.9 | 174 | 28.18 | 335 | 6792 | 13.92 | 94 a | 43.7 | 149 | 23.39 | 1022 a | 3958 a | 15.79 a | 62 a |
Field experiments performed in Rio Verde and Maracaí in the summer crop season of 2013/2014. Means (n = 6) on the same column which are followed by different letters are significantly different (p ≤ 0.10, Duncan test)
n.s statistically non-significant