My soil test indicates the need for- nitrogen 3-4 lb; phosphate 2.3 lb; potassium 5 lb- all are per 1,000 sq ft. What is a recommended source for adding these nutrients, preferably an organic source?
Macomb County Michigan
Is this for a vegetable garden, trees and shrubs or something else?
For a vegetable garden the soil test results listed have a high need for potassium. There is not one fertilizer only as an organic fertilizer but must combine multiple types as shown below.
In spring before planting use the following, working all into the top 4 inches of soil.
19 lbs per 1000 square feet using 4-12-0 (bone meal)
10 lbs per 1000 square feet using 12-0-0 (blood meal)
5 lbs per 1000 square feet using 0-0-50 (sulfate of potash)
One month after planting you could use the nitrogen only product 12-0-0 as a side dressing (sprinkling between plants but not touching the stems) Use about 12 ounces per 100 square feet.
Something that can be done this fall after the garden is finished is to apply the other half of sulfate of potash needed (apply same amount as in spring) and work it into the top 4 inches.