Buffer strips principally function in nutrient management to:
A) recycle non-renewable nutrients.
B) enrich the soil with nutrients that are needed for optimum plant growth.
C) slow the movement of potential pollutants to the groundwater.
D) prevent the transport of nutrients from fields to streams.
E) all of the above
Question 2
The ill effects of acidity in subsoils can be ameliorated by adding gypsum (CaSO4 2H2O) to the soil surface. Which of the following most likely helps account for this effect?
A) Sulfate ions from the gypsum react with H ions in the subsoil to form H2SO4.
B) Gypsum stimulates root growth in the surface soil horizons.
C) Gypsum dissolves and leaches downward, increasing the Ca/Al ratio in the soil solution in subsoil layers.
D) Calcium from the gypsum replaces hydrogen from colloids in the subsoil thereby increasing the soil pH.
E) The gypsum replaces hydrogen from colloids which moves down the profile and decreases the pH of the subsoil layers.
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