How can I increase the ion exchange equivalence of a blended soil?

Lime will not add to the CEC equiv. of your soil. The only product that I can think of that can add CEC is humic acid. Humates are huge, highly complex organic molecules with many negatively charged side groups. This is why they have a CEC around 500 meq/ 100g. This is about 10x CEC of the most fertile soil.

As far as a rate, that would depend on your application. Is this a field or containers? The product will have directions on the label.

Humic acid is available at fertilizer retailers and hydroponic shops. It should contain at least 5% humic acids by weight.

Google humic acid to learn more.

Well you add clay or you add organic material.

Clays vary a lot, but the CEC of different clays is pretty well worked out.

Organic material is more variable but has a lot of CEC.

Are you just taking the equivalent from tables or are you testing the soil? If testing are you using the tests that actually measure the CEC or are they simply adding up the cations to get the number?

I'm a bit nervous because you are mentioning many different calcium products for changing the CEC and they do not change the CEC at all, but what they do do is change the results of some tests used for CEC measurement. For instance as they raise the pH, the are also raising the base saturation. When the lab removes the cations and adds them together, they will get a higher number and thus probably report a higher CEC. Even calcium just sitting in the soil will get dissolved when the lab is testing and it will be reported as CEC.

So add clay or add organic material and you should be fine.

Marv

If your soil is primarily sand or silt, it can be impractical to raise its cation exchange capacity other than by adding organic material or clay. in effect the first step in your process is to abandon the attempt to do this with sandy soil. Those sandy soils are ok for some things but not your purpose.

A high clay content will have that cation exchange capacity, even a silty clay. But even a clay soil will be better with a lot of organic matter. A compost pile has a lot of cation exchange capacity.

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