Description: Steam processed bone, a slaughterhouse by product.
Benefit: Adds phosphorus.
Average NPK analysis: Varies from about 1-11-0 to about 3-15-0, also contains about 24 percent calcium.
Application and amount for adequately fertile soil: Till or rake in 3 pounds per 100 square feet for soil low in phosphorus; add 2 pounds per 100 square feet for soil with average fertility. Release time 6 to 12 months.
Comments: Fine ground bonemeal make phosphorus more quickly available to plants. The calcium in bonemeal will raise the soil pH. Available at garden centers and feed stores. Bonemeal is more expensive than rock phosphate.
? Coffee Grounds
Description: Used coffee grounds.
Benefit: Adds nitrogen, phosphorus, and potassium, also contains magnesium and copper.
Average NPK analysis: 2-0.3-0.6
Application and amount for adequately fertile soil: Till or sprinkle on the soil; 5 to 10 pounds per 100 square feet. Do not add more than 25 percent coffee grounds to a planting bed.
Comments: Coffee grounds are slightly or moderately acidic and can be balanced in the soil by adding a limestone supplement. Also compost coffee grounds as a nitrogen addition to your compost pile.
Description: Magnesium sulfate a chemical compound.
Benefit: Soil balancer, magnesium sulfate is an essential element in the chlorophyll molecule.
Average analysis: 10 percent magnesium, 13 percent sulfur.
Application and amount for adequately fertile soil: Use 1 tablespoon of Epsom salt in a gallon of water as a foliar spray; 1 pound per 1,000 square feet.
Comments: Epsom salt is highly soluble and is not persistent and will not build up in the soil.