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Table 2 Overview of the experimental design and setup at the different locations (1: Switzerland, 2: Italy, 3 and 4: Czech Republic, 5: Germany, 6: Denmark)

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

  1-Buus 2-Castel 3-Humpolec 4-Lukavec 5-Vörden 6-Taastrup
Factors tested (experimental design)
Crop
 Maize (variety: Colisée) x x x x x x
Bio-effectors
 No bio-effectors (BE0) x x x x x x
 BE1: Trianum-P x x x x   
 BE2: Proradix x x x x x x
 BE3: Rhizovital x x x x x  
Fertilizers
 No P fertilizer (P0) x x x x x x
 Triple Super phosphate x x x x x  
 Rock phosphate x x x x x  
 Local sewage sludge ashes      x x
 P-enriched BOF slag      x  
 Fresh Digestate x      
 Local composts x     x  
 Composted cattle manure   x     
 Composted horse manure   x     
 Local sewage sludges      x x
Experimental setup
 Amount of substrate per pot (kg-DW equivalent) 2.5 2.5 5 5 5 2.5
 Number of plants per pot at harvest 1 1 3 3 1 1
 Growth period (weeks) 8 8 15 15 8 6.5
 Number of replicates 5 5 5 5 4 3
 Soil to sand ratio 2:1 2:1 2:1 2:1 2:1 1:1
 Growing facilitiesa GC GC GH GH GH GH
  1. aGC means growth chamber and GH greenhouse