What is the primary benefit of contour plowing?

Contour plowing is an agricultural practice where plowing follows the natural contours of the land. This method is particularly effective in reducing soil erosion and runoff, which are significant concerns in farming. By creating furrows that run along the curves of the land rather than up and down slopes, contour plowing helps to slow water runoff during rainfall. This process allows water to soak into the soil more effectively, reducing the speed at which water flows and therefore minimizing the erosion of topsoil.

Additionally, the practice helps to retain moisture in the soil, which can lead to improved overall soil health. While it can indirectly support increased crop yields by protecting soil quality, the primary benefit lies in its function to curb erosion and manage water runoff effectively. The other choices, while beneficial in certain contexts, do not directly address the main advantage of contour plowing as clearly as the reduction of soil erosion and runoff.