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What is the main purpose of contour ploughing on slopes?

Answer and explanation

Correct answer: Reducing surface runoff and soil erosion

The governing soil-conservation principle is to interrupt the downhill movement of water. In contour ploughing, furrows are made along lines of equal elevation, or across the slope, rather than straight up and down it. These furrows and small ridges slow runoff, give rainwater more time to infiltrate, and reduce the force available to detach and transport topsoil. As a result, erosion is reduced and moisture may be retained more effectively. Ploughing down the slope would accelerate runoff, while increasing slope steepness or rapidly reducing fertility is not the purpose. Hence option A is correct.

Related tags

Contour PloughingSoil ConservationSoil ErosionSurface RunoffLand Resources And AgricultureGeographyClass 12 Mcq

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