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Table 3 Element-specific correlation matrix

From: Characterization of charcoal and firewood ash for use in African peri-urban agriculture

 H2SO4VinegarWater
Ca
 Aqua regia0.070.68**0.15
 H2SO4 0.260.16
 Vinegar  0.34*
K
 Aqua regia0.68***0.50**0.69***
 H2SO4 0.61***0.73***
 Vinegar  0.55***
Mg
 Aqua regia0.92***0.84***0.04
 H2SO4 0.87***− 0.01
 Vinegar  −  0.03
Na
 Aqua regia0.72***− 0.220.84***
 H2SO4 0.550.72***
 Vinegar  − 0.09
P
 Aqua regia0.87***0.49**− 0.04
 H2SO4 0.57***0.00
 Vinegar  0.06
  1. ***  P < 0.001
  2. ** P < 0.01
  3. *P < 0.05