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That stuff is very low in nutrients. Compared to an 8-3-9, you have to use 180 pounds of compost for an equivalent amount of potassium in 1 pound of chemical fertilizer. On a mature tree, you have to use 540 pounds. If you want to use bagged composted manure, use black kow which is 10 times stronger. The higher phosphate of a balanced fertilizer can cause iron deficiency.