what to add to sandy soil for a garden?
 In sandy soil: add 3 to 4 pounds of ground limestone per 100 square feet. In loam: add 7 to 8 pounds per 100 square feet. In heavy clay: add 8 to 10 pounds per 100 square feet. Alkaline Soil. If your soil is higher than 6.8, you will need to acidify your soil. 