Certain types of rocks can significantly increase the acidity in the soil. When soil becomes acidic, some plants cannot thrive and grow. Elements like aluminum and manganese can become toxic because of their higher solubility in low pH soils. The good news is that it is relatively easy to reduce the acidity in soil from gravel. Few tools are needed and it takes just a little time. By reducing the acidity in the soil, plants can once again thrive.
Test the soil with a pH meter in multiple locations to see exactly where the acidic areas are.
Apply lime at a rate of 50 lbs. per 1,000 square feet. Use a broadcast spreader to distribute the lime evenly over the area.
Mix the lime into the top 6 to 8 inches of soil with a rototiller. Lime will not become soluble in water, which is why the mixing is necessary.
Retest the soil's pH level after a few months. If the soil is still acidic, reapply lime to further raise the pH.