Possibly an overdose of fertilizer. What do the instructions on the Osmocote package say? Mine says 1 scoop (the scoop is 1/4 cup) per 2'x2' area. A 5-gallon pail is less than 1'x1' so that would be just under a tablespoon of Osmocote per bucket. 1/4 cup of the Osmocote I'm using would be over four times the recommended amount for a 5-gallon bucket. The cow manure and Neptune's Harvest would add to the problem, but I would suspect that excessive Osmocote may be doing most of the damage.
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