Skip to main content

Table 1 Soil chemical properties, granulometry and population of free-living diazotrophic bacteria at the 0–20 cm layer of the field sites before sowing

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

Site pH (CaCl2) Al (cmolc dm−3) H + Al (cmolc dm−3) K (cmolc dm−3) Ca (cmolc dm−3) Mg (cmolc dm−3) P (g dm−3) C (g dm−3) SB (cmolc dm−3) BS Granulometry (%) MPNa
% Clay Silt Sand NMP soil g−1
2012/2013
 Ponta Grossa 4.60 0.26 3.07 0.37 3.55 1.73 1.71 18.55 5.65 64.79 58.4 15.7 25.9 1.5 × 104
 Cachoeira Dourada 5.40 0.00 7.89 0.15 2.02 1.30 0.80 30.50 3.47 30.54 57.8 18.2 24.0 4.5 × 106
2013/2014
 Rio Verde 5.02 0.10 3.03 0.17 3.46 0.94 2.45 29.43 4.57 60.13 36.3 9.6 54.1 2.5 × 106
 Maracaí 5.42 0.00 1.12 0.05 1.20 0.34 6.57 4.88 1.59 58.67 8.8 0.8 90.4 1.5 × 106
2014/2015
 Londrina 5.20 0.00 3.67 0.50 3.91 1.75 11.10 11.10 6.16 62.66 71.0 8.2 20.8 9.0 × 106
 Ponta Grossa 4.90 0.07 4.10 0.44 2.95 1.06 25.70 18.00 4.45 52.05 23.8 3.0 73.2 4.5 × 105
  1. SB sum of bases, BS bases saturation = [(K + Ca + Mg)/Tcec] × 100, where Tcec = K + Ca + Mg + total acidity at pH 7.0 (H + Al)
  2. aEstimated by the most probable number method by dilutions and counts in semi-solid NFb medium