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Table 2 Effect of Azospirillum brasilense strains CNPSo 2083 and CNPSo 2084 and of enriched metabolites of R. tropici strain CIAT 899 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 57 and 51 days after sowing (DAS), and grain (yield) at the physiological maturity of maize hybrid DOW 2B 707 HX

From: Maize growth promotion by inoculation with Azospirillum brasilense and metabolites of Rhizobium tropici enriched on lipo-chitooligosaccharides (LCOs)

Treatment Ponta Grossa Cachoeira Dourada
57 DAS Maturity 51 DAS Maturity
SDW (g pl−1) PH (cm) NS (g kg−1) TNS (mgN pl−1) Yield (kg ha−1) SDW (g pl−1) PH (cm) N (g kg−1) TNS (mgN pl−1) Yield (kg ha−1)
Non-inoculated control 56.1ns 252ns 23.04ns 1292ns 8406 b 33.1 c 234ns 21.16ns 700 b 6310 b
Seed inoculated (Azospirillum) 58.3 260 23.86 1391 8850 b 44.1 a 242 21.00 926 a 6567 b
Seed inoculated (Azospirillum + enriched metabolites) 52.7 253 22.64 1193 9225 a 40.8 ab 243 21.94 895 a 7373 a
Leaf spray inoculation (Azospirillum) 55.0 258 22.45 1235 8567 b 36.9 bc 241 21.10 779 b 6543 b
Leaf spray inoculation (Azospirillum + enriched metabolites) 55.2 256 22.71 1254 9256 a 36.4 bc 238 21.06 766 b 7286 a
  1. Field experiments performed in Ponta Grossa and Cachoeira Dourada, Brazil, in the summer crop season of 2012/2013. Means (n = 6) on the same column which are followed by different letters are significantly different (p ≤ 0.10, Duncan test)
  2. n.s. statistically non-significant