What type of surfaces are typically where fertilizer application is banned?

Fertilizer application is typically banned on impervious surfaces due to the risk of run-off that can lead to water quality issues. Impervious surfaces, such as concrete or asphalt, do not allow water to penetrate. When rain or irrigation occurs, it can cause fertilizer to wash off these surfaces and flow into storm drains, rivers, lakes, and other water bodies. This run-off can contribute to nutrient pollution, resulting in harmful algal blooms and other ecological problems.

In contrast, other surface types do not present the same level of risk when it comes to fertilizer application. Sandy surfaces, while they may have some drainage, can often hold nutrients well enough that controlled applications can occur without significant run-off risk. Permeable surfaces, such as soil or grass, allow for natural absorption and use of nutrients by plants. Organic surfaces, related to organic matter or compost, benefit from fertilizer as part of a soil health strategy. Thus, for these reasons, impervious surfaces are designated as areas where fertilizer application is restricted or banned.