Answer :
Assuming all CEC sites are bound by ions, the base saturation in this soil would be approximately 92.5%.Approximately 7.5% of the CEC sites in the soil are occupied by H+ ions.
a) To calculate the percentage of sites taken by H+ ions, we need to divide the number of occupied sites by the total number of sites and then multiply by 100.
Given that the CEC of the soil is 20 meq and 1.5 meq are occupied by H+ ions, the percentage of sites taken by H+ ions can be calculated as:
Percentage of sites taken by H+ ions = (Occupied sites / Total sites) * 100
Occupied sites = 1.5 meq
Total sites = 20 meq
Percentage of sites taken by H+ ions = (1.5 / 20) * 100 = 7.5%
Therefore, approximately 7.5% of the CEC sites in the soil are occupied by H+ ions.
b) The base saturation refers to the percentage of CEC sites that are occupied by basic cations such as calcium (Ca2+), magnesium (Mg2+), potassium (K+), and sodium (Na+). Assuming all CEC sites are bound by ions, the base saturation can be calculated by subtracting the percentage of sites taken by H+ ions from 100%.
Base saturation = 100% - Percentage of sites taken by H+ ions
Since the percentage of sites taken by H+ ions is 7.5%, the base saturation can be calculated as:
Base saturation = 100% - 7.5% = 92.5%
Therefore, assuming all CEC sites are bound by ions, the base saturation in this soil would be approximately 92.5%.
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