The question is rich in what? Nitrogen or phosphate, or potassium, or sulfur, or a few of the trace minerals? Most places have a county agent for the USDA where you can take a soil sample for testing and the results will tell you what to use for what. It can me to acidic or to sweet. Sweet = high ph, Acidic = low ph. You can plant a short row of okra and let it grow until it stops. Pull up a plant and inspect the roots for nematodes.We put nematodes on our lawn to eat flea larva.
Probably our soil is too rich.