Contour farming is good business- if your land is sloping and you're troubled with soil and water run-off. Farners by and large know the good that comes from conservation practices. Yet many who have sloping land haven't made the shift to contour farming. They wonder about the costs involved.
Allen, Carl W.
"Fence For Contour Farming,"
Iowa Farm Science: Vol. 3
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol3/iss2/2