Which of the following does not describe aluminum hydroxy ions (such as Al(OH)2+) in the soil?
A) They block negative sites on some clays thereby reducing the cation exchange capacity.
B) They influence the swelling of some clays by entering into the interlayer spaces.
C) They are commonly applied to help reduce the soil pH for acid-loving plants.
D) They affect the pH of the soil solution through hydrolysis.
E) They are more prominent in acid than in neutral soils.
C
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 figure 1.png)
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