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Sorry to hear about that, I would've waited a few more weeks before giving them any fertilizer, personally. I hope you have better luck with the next round!
Looks underfed nitro in that pic... flush and no food is prob what killed em. Personally never seen a overdos3 of nitro and a flush kill a plant. Therefore I have to assume it was underfed pic shpws that but could b the light... plus the fact that they died....
It really looked like they were over watered IMO....but hard to tell without more info and better pics....I weigh the containers by feel and let the leaves droop a bit before I add water at that stage of development. Giving them lots of water won't encourage root development and the root ball will stay fairly shallow. Make them search for water till they are big enough to use all that water.
Spot looks good.....hope you played grass over that bed....help hide it and keep the top layer moist to promote micro diversity and size.
looks like your roots are too wet/ overwater, that is not nitrogen overdose, nitrgogen over dose is dark green and you have no burn marks on the tips... water less or wait longer and let them dry out before watering again. Better air movement/exchange so they do dry out. too wet roots rot dropping ph or weird ph issues....
might have added to it, believe it or not watering is one of the most common mistakes when learning to grow cannabis, takes time to get the feel. You will get it///
Over water pretty sure. Organics r tricky, u seem to know more then most. Good luck. Easy would b to use some chem veg nute with your peat perlite. All u got to do is water properly. Thats it.