What impact does contour ploughing have on irrigation needs?

Contour ploughing is a conservation technique where ploughing is done along the contour lines of a slope rather than up and down. This method creates a series of ridges and furrows, which can slow down water runoff and enhance water infiltration into the soil. As a result, contour ploughing helps to retain moisture in the soil, reducing the overall need for supplementary irrigation.

The practice is particularly beneficial in hilly or sloped areas where water drainage can lead to erosion and loss of topsoil. By effectively managing water flow and promoting water retention, contour ploughing lessens the dependency on artificial irrigation sources, thereby making it a sustainable farming technique that conserves water resources.

In this context, it is clear why the practice of contour ploughing would lead to a reduction in the need for irrigation. This efficiency in moisture retention can significantly enable crops to thrive on natural rainfall alone, which supports sustainable agricultural practices.