Table 3. Base ratios in the soils used as substrate to fill the bags for root sampling

  Ca/mg Ca/KMg/K Ca+Mg/K
Reference 2.5 5 - 25 2.5  - 15 10 - 40
Soil 1 6 80 14 30
Soil 2 7 323 45 74

 Soil 1 and 2 came from sites with high and low PC incidence, respectively