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Table 4 Nodulation [nodule number (NN) and dry weight (NDW)], shoot dry weight (SDW), N concentration (NC) and total N accumulated in shoots (TNS) and grain yield of soybean cultivar BMX Potência RR inoculated or not with Bradyrhizobium japonicum CPAC 15 +B. diazoefficiens CPAC 7 and supplemented or not with genistein (5 μM) or concentrated metabolites (CM) of B. diazoefficiens USDA 110 (BD1) or Rhizobium tropici CIAT 899 (RT1). Experiments performed in two field sites in Brazil

From: Biotechnological potential of rhizobial metabolites to enhance the performance of Bradyrhizobium spp. and Azospirillum brasilense inoculants with soybean and maize

Treatments Bonito Ponta Grossa
  V4 R2 Maturity V4 R2 Maturity
  NN NDW SDW NC TNS Yield NN NDW SDW NC TNS Yield
  (# pl –1) (mg pl –1) (g pl –1) (mg N g –1) (mg N pl –1) (kg ha –1) (# pl –1) (mg pl –1) (g pl –1) (mg N g –1) (mg N pl –1) (kg ha –1) `
Non-inoculated control 10.4 ab2 43.2 b 18.4 ab 20.2 a 371 b 2701 b 45.7a 163 ab 10.4 ab 36.5 a 379 a 3166 a
Inoculated with Bradyrhizobium 15.1 ab 68.4 a 13.3 ab 20.4 a 271 c 2703 b 42.0 a 149 b 10.4 ab 35.1 ab 365 a 3191 a
Inoculated + genistein 10.7 ab 43.6 b 14.4 ab 20.2 a 290 c 2737 ab 48.7a 171 ab 12.3 a 32.0 b 393 a 3337 a
Inoculated + CM-BD1 (1 mL L–1)1 18.2 a 65.4 a 17.4 ab 17.6 a 306 c 2750 ab 52.5 a 206 a 12.1 a 34.6 ab 418 a 3359 a
Inoculated + CM-BD1 (0.1 mL L–1) 16.0 a 68.1 a 19.8 ab 17.6 a 348 b 2906 a 57.8 a 212 a 11.3 ab 34.6 ab 390 a 3275 a
Inoculated + CM-RT1 (1 mL L–1) 7.3 b 25.1 c 10.4 b 16.8 a 174 d 2641 b 45.3 a 170 ab 9.2 ab 33.4 ab 307 a 3202 a
Inoculated + CM-RT1 (0.1 mL L–1) 13.4 ab 69.9 a 23.4 a 18.1 a 423 a 2817 ab 46.8 a 162 ab 8.9 b 35.3 ab 314 a 3253 a
  1. 1 0.1 and 1.0 mL L–1 correspond to approximately 10–9 and 10–8 M of active compounds, respectively.
  2. 2 Data represent the means of six replicates and when followed by different letters within the same column are significantly different (p ≤ 0.05, Duncan’s test).