How to Mix Soil for Blueberries

Blueberries grow best in acidic, well-aerated soil. White blossoms, glossy green leaves and vibrant blue fruit production all increase when soil acidity hovers between a pH of 4 and 5. Roots can easily suffocate if the soil is too dense, so selecting prime real estate for growing blueberries is crucial. Experts at the Oregon State University Extension Service recommend acidifying soil years before actually planting blueberries. However, one-time treatments to acidify soil are generally effective. Elemental sulfur provides faster results than nitrogen fertilizer, but either may be used.

Soil pH testing kit
Elemental sulfur
Nitrogen fertilizer

Instructions

- 1
  Determine the acidity of your soil by inserting a small sample into a pH testing kit. Soil testing kits are available at most garden centers and cost between $5 and $15. Generally, a soil pH testing kit will require less than 1 tsp. of soil and provide results within minutes.
- 2
  Add an appropriate amount of elemental sulfur to the soil based on its acidity and type. Sandy, basic soils (those with a pH above 7) require between 10 and 20 lb. of sulfur mixed into every 1,000 square feet. If the soil has a high concentration of clay, 40 to 50 lb. of sulfur must be mixed into each 1,000 square feet. To add sulfur to the soil, sprinkle the appropriate amount over the outer layer and till approximately 6 inches deep. Soil will reach optimum acidity for planting after six months.
- 3
  Add 3.5 lb. of nitrogen fertilizer per 1,000 square feet of soil if you have chosen not to use sulfur. Till the soil at least 6 inches deep to fully incorporate the fertilizer. Reapply nitrogen fertilizer every three to four months using the same process and measurements, taking soil samples immediately prior to reapplication. Generally, soil reaches optimum acidity after two years of nitrogen fertilizer applications.

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