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Table 6 Shoot biomass improvement (%) of the different BE treatments relative to the un-inoculated control (BE0)

From: Potential of three microbial bio-effectors to promote maize growth and nutrient acquisition from alternative phosphorous fertilizers in contrasting soils

  Trianum-P (BE1) Proradix (BE2) Rhizovital (BE3)
Overall BE effect
(across all treatments)
7.5% 5.2% 6.0%
 Number of observations 50 87 78
BE effect in the different soils (across all fertilizers types)
 Buus (Switzerland) 2.7%ba 0.4%ba 8%aa
 Castel (Italy) 12.3%aa 7.8%ba 6.7%aa
 Vörden (Germany) Not measured 3.4%aba 3.6%ba
 Taastrup (Denmark) Not measured 17.0%aa Not measured
BE effect with the different fertilizer types (across all soils)b
 No fertilizer added 10.8%aa −1.2%ba −11.5% ba
 Organic fertilizer 6.9%aa 14.0%a a 13.0% a a
 Inorganic fertilizer 6.4%aa 1.5%ba 7.3% aa
ANOVA on the effect of soil, fertilizer type and their interaction
 Soil (p value) 0.0002 (df = 1) 0.0070 (df = 3) 0.0054 (df = 2)
 Fertilizer type (p-value) ns (df = 2) <0.0001 (df = 2) <0.0001 (df = 2)
 Soil x fertilizer type (p-value) <0.0001 (df = 2) <0.0001 (df = 6) <0.0001 (df = 4)
  1. df means degree of freedom
  2. See “Methods” section for description of the calculations
  3. aLevels not connected by the same letter are significantly different (Tukey’s HSD test P < 0.05)
  4. bUnderlined combinations of BE and P fertilizer type indicate when BE addition significantly improved shoot biomass as compared to the un-inoculated control with the same fertilizer type (t-test with P < 0.05)