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The buffering of soil pH is often directly related to the quantity of aluminium in soil solution and taking up exchange sites as part of the cation exchange capacity. This aluminium can be measured in a soil test in which it is extracted from the soil with a salt solution, and then is quantified with a laboratory analysis.
A soil test is a laboratory or in-situ analysis to determine the chemical, ... Lime soil as recommended by soil test (a pH of 6.5 minimizes lead availability)
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The tests also include soil pH, organic matter and cation exchange capacity. Each test includes nutrient application recommendations for the targeted crop or plant species based on the sample ...
The information provided to gardeners in soil test results is sometimes compared to the information that blood tests provide to physicians. In this vein, a soil test is like a blood test for the soil.
Effect of soil pH on cation-exchange capacity. The amount of negative charge from deprotonation of clay hydroxy groups or organic matter depends on the pH of the surrounding solution. Increasing the pH (i.e. decreasing the concentration of H + cations) increases this variable charge, and therefore also increases the cation-exchange capacity.