Increases in soil test phosphorus levels correspond with what risk?

Increases in soil test phosphorus levels correspond with a higher chance of water contamination because phosphorus is a key nutrient that can trigger algal blooms when it runs off into waterways. Elevated phosphorus levels in soil indicate that there is a potential for excess phosphorus to leach or run off during rainfall events. This runoff can lead to eutrophication in nearby water bodies, which diminishes water quality, affects aquatic life, and can create harmful algal blooms. Maintaining balanced soil phosphorus levels is crucial in managing agricultural practices and safeguarding water resources.

While other options may relate loosely to agricultural practices, they do not directly address the primary concern associated with excess phosphorus in soil. Erosion rates and contamination risks can be influenced by various factors beyond soil phosphorus, such as land management practices, while reduced crop yields may not necessarily be linked to increased phosphorus levels, as adequate phosphorus can actually support plant growth if managed properly.