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Table 4 Correlations coefficients between some microbial and chemical factors

From: Microbial activities in soil cultivated with corn and amended with sewage sludge

  Cmic Nmic BR FDA qCO2 Corg Cmic:Corg Nmic:Ntot Cu Cr Ni Zn Ntot K P
Nmic 0.33               
BR 0.76** 0.19              
FDA 0.29 0.45 0.55*             
qCO2 0.1 0.04 0.71** 0.59*            
Corg 0.54* 0.27 0.88*** 0.77*** 0.77***           
Cmic:Corg 0.82*** 0.16 0.31 −0.19 −0.38 −0.03          
Nmic:Ntot −0.06 0.79*** −0.36 −0.06 −0.4 −0.33 0.11         
Cu 0.39 0.51 0.7** 0.82*** 0.67** 0.9*** −0.16 −0.06        
Cr 0.64* 0.57* 0.78*** 0.76** 0.53* 0.82*** 0.19 −0.04 0.87***       
Ni 0.64* 0.6* 0.77*** 0.74** 0.52* 0.78*** 0.22 0.03 0.77*** 0.94***      
Zn 0.49 0.32 0.83*** 0.8*** 0.75** 0.97*** −0.08 −0.3 0.94*** 0.86*** 0.8***     
Ntot 0.77*** 0.28 0.89*** 0.49 0.49 0.79*** 0.37 −0.25 0.69** 0.77*** 0.71** 0.75**    
K −0.36 −0.61* −0.35 −0.66** −0.17 −0.4 −0.13 −0.22 −0.52* −0.72** −0.68** −0.44 −0.52*   
Pav 0.59* 0.31 0.89*** 0.78*** 0.72** 0.98*** 0.04 −0.29 0.87*** 0.84*** 0.81*** 0.96*** 0.79*** −0.47  
pH −0.01 −0.37 −0.23 −0.66** −0.39 −0.5 0.35 −0.09 −0.49 −0.39 −0.4 −0.48 −0.25 0.53* −0.49
  1. BR, basic respiration; FDA, fluorescein diacetate activity; qCO2, metabolic quotient
  2. * p < 0.05; ** p < 0.01; *** p < 0.001