What does applying fertilizer along edges ensure?

Applying fertilizer along edges ensures no fertilizer waste is achieved by limiting the amount of fertilizer that may otherwise be applied to areas where it is not needed, such as sidewalks, driveways, or flower beds. When fertilizer is applied carefully to the edges, it minimizes runoff and ensures that the nutrients are directed towards the intended areas. This practice not only optimizes the use of resources but also protects the environment from potential nutrient contamination in non-target areas.

The other options do not directly relate to the primary benefit of applying fertilizer along edges. For instance, while better overall coverage or increased application speed may be desirable goals, they do not specifically address waste reduction. Correct spreader calibration is essential for effective application but does not inherently relate to the strategic practice of applying fertilizer along edges. Thus, the emphasis on minimizing waste is what makes this choice the most appropriate in the context of the question.