Which of the following is a good soil conservation method to reduce the loss of topsoil on gentle slopes that are farmed?
A) Planting crops parallel to the contours of the slope.
B) Leaving crop residues (i.e., stalks) in place in the field.
C) Planting grass in natural drainageways on the slope.
D) All of these choices are good for soil conservation.
Answer: D
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