I'm finally getting ready to grow indoors again and I ran a Rapitest on my soil, which shows surplus nitrogen. This soil was last used back in June 2022. After harvest, I top dressed with aged cow manure, mulched, and kept it damp since then. Is this N level going to be toxic to autoflowers? I was planning on inserting 32 oz. quart-sized plugs of light mix into the pot for starting the seeds. 3 med/small Mephisto autos in a 20 gallon fabric pot. Anything helps, thanks.