The Ill Effects of Acidity in Subsoils Can Be Ameliorated

question 71

Multiple Choice

The ill effects of acidity in subsoils can be ameliorated by adding gypsum (CaSO_4-2H₂O) to the soil surface. Which of the following most likely helps account for this effect?

• A) The gypsum replaces hydrogen from colloids which moves down the profile and decreases the pH of the subsoil layers.
• B) Calcium from the gypsum replaces hydrogen from colloids in the subsoil thereby increasing the soil pH.
• C) Gypsum dissolves and leaches downward, increasing the Ca/Al ratio in the soil solution in subsoil layers.
• D) Sulfate ions from the gypsum react with H ions in the subsoil to form H₂SO₄.
• E) Gypsum stimulates root growth in the surface soil horizons.

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