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Table 8 Exchangeable cations and exchangeable sodium percent in the soil profile as influenced by irrigation water quality

From: Effect of contamination sources on the rate of zinc, copper and nickel release from various soil ecosystems

Soil Exchangeable cations (meq/100 g soil) ESP CEC meq/100 g
Na+ K+ Ca++ Mg++
Kombora
 UC* 6.64 1.17 8.80 5.69 15.06 44.09
 C* 7.61 2.23 7.50 4.27 15.45 49.24
Abo Rawash
 UC* 3.35 0.56 5.61 3.56 18.62 17.99
 C* 2. 74 0.42 3.88 1.48 20.28 13.51
Kafr-Elsheikh
 UC* 13.81 1.47 3.22 3.35 35.59 38.8
 C* 14.60 1.58 3.11 4.16 40.19 36.33
  1. UC uncultivated soil, C cultivated soil