The soil with the ideal acidity level for raspberry plants is that with a pH of 5.8 to 6.5. Always test the pH level of the soil before changing the acidity. It is possible to create a soil that is too acidic or too alkaline for raspberry bushes.
Raspberry plants enjoy plenty of organic material mixed into the soil. Work at least 1 inch of organic matter into the top 4 to 6 inches of the soil before planting. Organic materials that are suitable include lawn clippings, rotten leaves or animal manure.
Improve the soil fertility before planting by adding slow-release fertilizer in the top 6 inches of the soil. Use 3 pounds of 10-10-10 fertilizer for every 100 square feet of planting area and immediately water the fertilizer into the soil.