It's something that many of us container growers have learned to avoid through trial and error. When plants mature you can use a small amount of manure as a top dressing but now I just avoid it entirely. It may sound silly but I begin my potting mixes months before I actually plant in it. I'm a total nerd when it comes to my soils. I have soils I make for seedlings, soil for rooting, and soil for the final growing container. I could talk about soil for an hour and only scratch the surface but I won't preach. My only suggestion now would be to flush it heavy and add some dolomite to reduce the urea in the soil. Good luck with your grow.