You can over do it on composting
For years I have been adding composted material to my garden; composted grass and leaves, composted horse manure and plant a Fall, Winter cover crop each year.
Problem when I got soil test back; phosphorus 973 lb/ac, potassium 267 lb/ac, calcium 4,504 l/a, magnesium 493 l/a.All readings are max excessive with magnesium high.
Called Clemson Ag to discuss results; was told to add no compost until readings dropped into sufficient range.
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