Dampen the soil. Water the soil thoroughly and let dry for a few days.
Dig the soil. Go to a depth of about 10 inches. Break up dirt clods, and remove any stones or debris.
Add the amendment. Spread it over the soil. Add fertilizer according to package directions, if desired. Mix with a spading fork, incorporating the amendment evenly into the soil. Level the bed with a rake, breaking up any remaining clods of earth.
Water well. Let the improved soil settle for a few days after watering.