Explain the contour farming and terracing used for soil conservation.

Contour farming is the practice of tilling sloped land along lines of consistent elevation in order to conserve rainwater and to reduce soil losses from surface erosion. These objectives are achieved by means of furrows, crop rows, and wheel tracks across slopes, all of which act as reservoirs to catch and retain rainwater, thus permitting increased infiltration and more uniform distribution of the water. The practice has been proved to reduce fertilizer loss, _______ _________ _____ _________ _________ _____ ___ _________ ______ _________ ____.
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