Can i use synthetic nutrients in my organic growth?

Should not be a problem. Its one in the same thing. Does the microbes break down the whole ingredient things into N or do you provide the N directly to the substrate like with urea. Some things like excess P can be harmful to fungi but we are growing weed not fungus. and even then it won't kill it off, it will just reduce its growth. I grow in soil outdoors and use manures and compost as well as liquid additives like salt based fertilizers. everything works out. Long term is where the issue can come from but just add back into the soil and your good.