Which practice aids in preventing soil erosion effectively?

• A. Planting in straight rows
• B. Contouring land with slopes
• C. Using herbicides regularly
• D. Maximizing chemical fertilizer use

Answer: (B)

Contouring land with slopes is an effective practice for preventing soil erosion due to its ability to follow the natural shape of the land. This method involves plowing and planting across the slope of the land instead of up and down. By doing so, contouring helps to slow down water runoff, allowing more water to soak into the soil rather than washing it away. It also creates natural barriers that can trap soil and organic matter, further enhancing soil retention.

This technique is particularly beneficial in hilly or sloped areas where the risk of erosion is higher due to gravity and runoff. When land is tilled along its contours, it reduces the speed of water flow, minimizing the likelihood of soil being eroded. The incorporation of vegetation into this practice also serves to anchor the soil, providing added stability and preventing further erosion.

Other methods, such as planting in straight rows or using herbicides and chemical fertilizers, do not address the underlying issue of soil displacement. These practices may have their own benefits but do not effectively mitigate erosion in the way that contouring does.