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Table 5 Forward selection of environmental variables that best described difference in microbial species between soil samples

From: Comparative study of microbial structure and functional profile of sunflower rhizosphere grown in two fields

Environmental variable Explains % Contribution % Pseudo-F p value
N-NO3 (mg/kg) 89.7 94.6 17.4 0.052
pH 85.0 90.8 11.3 0.18
Res (ohm) 75.8 82.9 6.3 0.276
N-NH4 (mg/kg) 69.3 72.9 4.5 0.048
Sand (%) 60.8 63.5 3.1 0.078
Clay (%) 52.1 53.3 2.2 0.18
Total N (%) 40.4 39.8 1.4 0.32
Total C (%) 39.7 39.0 1.3 0.33
Na+ (mg/kg) 35.3 29.9 1.1 0.454
OM (%) 25.7 23.1 0.7 0.646
K+ (mg/kg) 13.5 18.4 0.3 0.96
P3− (mg/kg) 11.7 15.9 0.3 0.964
Ca2+ (mg/kg) 7.1 8.5 0.2 0.886
Silt (%) 7.1 3.4 0.2 0.668
Mg2+ (mg/kg) 5.5 6.0 0.1 0.966