In the spring, many hillsides get the wanderlust. Coaxed by driving rains, billions of soil particles run off to muddy creeks—leave the farm forever!

Fortunately, you can fight this mass migration of topsoil, fertilizer, and organic matter by working your ground on the contour. Of course, contour farming may not in itself < urb emsion completely. It works hand * in c'lj-.e v iui terracing, strip cropping, crop

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