Too much bagged cow manure??
With an analysis of 1-1-1, it would be almost impossible for the cow manure to cause fertilizer burn on your plants. It might, however, be high enough in salts to affect germinating seedlings. Primarily, though it should be good organic matter that would help the growth of plants. If you're concerned about it being too concentrated, you could mix in some of the existing soil to dilute the effect of the cow manure.
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