Question

How does contour ploughing reduce soil erosion?

Answer 1

1. Creates natural barriers: Ploughing across a slope creates horizontal ridges and furrows, which act as natural barriers. These act as small dams, preventing rainfall from pouring straight down the hill.
2. Slows down water velocity: By reducing the downward momentum of water, the land is protected against severe runoff. Slower water lacks the force to create deep, erosive gullies on the hillside.
3. Enhances ground absorption: Trapped water sits in the horizontal tracks longer rather than draining out. This allows the soil to absorb more moisture, retaining healthy topsoil and nutrients.
4. Preserves vital nutrients: Preventing runoff keeps fertilisers and organic materials from washing away. This maintains soil fertility and increases agricultural yields on sloped fields.

Answer 2

1. Creates natural barriers: Ploughing across a slope creates horizontal ridges and furrows, which act as natural barriers. These act as small dams, preventing rainfall from pouring straight down the hill.
2. Slows down water velocity: By reducing the downward momentum of water, the land is protected against severe runoff. Slower water lacks the force to create deep, erosive gullies on the hillside.
3. Enhances ground absorption: Trapped water sits in the horizontal tracks longer rather than draining out. This allows the soil to absorb more moisture, retaining healthy topsoil and nutrients.
4. Preserves vital nutrients: Preventing runoff keeps fertilisers and organic materials from washing away. This maintains soil fertility and increases agricultural yields on sloped fields.