Indicate which ion is preferred by soil in each graph.

 

1.0 0.8- 0.6-- 0.4 K-Na I = 0.010 0.00 0.0 0.2 0.4 0.6 0.8 1.0 0.2 1.0 0.8- 0.6- 0.4 EMg 0.2 Mg-Ca I = 0.001 0.00 0.0 0.2 0.4 0.6 0.8 1.0 EMg k 1.0 0.8 0.6- 0.4-- K-Mg I= 0.010 I = 0.001 0.2 0.00 0.0 0.2 0.4 0.6 0.8 1.0 Cation exchange isotherms for several cation exchange systems. E equivalent fraction in the solution phase, equivalent fraction on the exchanger phase. The broken lines represent nonpreference exchange isotherms. From Jensen and Babcock (1973), with permission.