Which of the following is NOT a practice for controlling erosion?

Concrete barriers are primarily designed to manage stormwater runoff and protect against flooding or structural erosion rather than to control erosion directly. While they can help redirect water flow, their primary function is not to enhance soil stability or erosion control in the same way the other options do.

Mulches serve as a protective layer over the soil, helping to retain moisture, suppress weeds, and reduce soil erosion by absorbing the impact of rainfall. Soil binders, which may include various chemical solutions or natural materials, help to solidify and stabilize topsoil, making it less prone to being washed away. Vegetation, including grass and plants, plays a crucial role in preventing erosion by binding soil particles together with their root systems, reducing runoff velocity, and allowing for better water absorption.

In comparison, concrete barriers do not address the underlying soil health or stability, which is essential for effective erosion control.