题目内容

The amount of active acid in the soil is far greater than that of potential acid.

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The content and composition of each component in the soil solution vary with soil type, soil layer and season.

Soil solution refers to the aqueous solution in the soil, excluding the gas and solute contained therein.

The redox potential decreases with increasing pH under certain conditions.

The secondary clay mineral colloid has the strongest acid-base buffer capacity while the humic colloid has the lowest acid-base buffer capacity in soil colloids.