Plants dying any suggestions plz

Hi guys kinda struggling here almsot feeling a little embarassed dont know what happened everything was going well and then in a real hurry things went sideways got 23 plants (had 24 and stupid gdp turned out to be a male) in a brand new room ive set up and probably 5 of them are showing serious problems brown crispy leaves and rusty brown on a few others. Ill list some details hopefully anyone can help

Lights 2 Chinese qb550 v2
4 x mars 400w upgraded with citi 1212 cobs 6 per light approx 3ft away from cannopy
Medium is soil amended with various organic amendments such as kelp rock phosphorus bat guano alfalfa meal and top dressed with bone meal and gaia green flowering formula
Watering is just straight water with epsom salt added...wife wasnt p.h. 'ing the water for the last month or so when she was helping me with feeding so p.h. has been around 8 on the water untill i found out and have been keeping it 6.2-6.5
Temps are 80-85 f on lights on

Once i started seeing signs first thought was cal/mag so top dressed with diatimoscious earth and epsom salt in water nothing improved though maybe potassium so top dressed with kelp still no improvements so thought maybe phos so tried a bloom booster with 0-5-4 still no improvements amd getting quite stressed really hoping i dont lose these plants im a medi patient and cant afford lose my medecine if anyone can provide some assistance would be greatly appreciated i know they look terrible just hoping i can save them and learn from this experience

Your not going to see an improvment once it (the leaves or the plant) turns bad it doesnt recover so you need to look at the new growth for any signs that things are going good.
plants are burnt up
You need microbes to break all that organic inputs down so the plant can uptake it.
Dont use kelp after week 2 of flower.
Best thing to do is flush the pots thoroughly. as in a lot water in a bloom nute at about 600ppms and get some microbes in there.
If you had microbes the 8 ph wouldnt be an issue to even mention it.
Pick off all the dead leaves they are done and are blocking light on anything still good., try to get to the finish.

Dont understand why you thought diatimoscious earth and epsom salt would fix a cal/mag issue.
Plenty of videos to learn how to grow weed go on youtube and type in harley smith and watch all those videos 6 times each. And then watch them again.

Well just assumed epsom for the mag diatomaceous earth is rich in calcium bentonite from my understanding so thought that would help so basically my best bet is just remove the dead and feed with a compost tea and the following feed mild bloom nutes im just worried about over feeding with all the top dressed amendments to be honest...any thoughts on what specific deficiency/ies im showing

probably over fert. for instance ,epsom salt is very strong and you dont just water with it as part of your regime. you water with it once or twice IF you need it. ie you see tell tale leaf pallor/marbling between veins starting from the bottom.
id say thats your problem. not only can you burn your plants with that stuff but it can lock out other nutrients.

a lesson ive learned is less is more with cannabis. dont go throwing to much of anything at it. and definitly dont go messing with calcium and magnesium unless you need to.

Thanks i was thinking i fried the shit out of them with the top dress and possibly too frequent epsom salts.. it's not my first grow but definietly lots of learning still but this definietly is the worst my plants have ever gotten you think just a plain water feed would be worth while or brew some tea with just some earthworm castings and molasses ?

My only concern flushing or even using a tea is with the amendments in there if it is burnt/excess nutes am i gonna make it worse with each feed releasing more of the excessive nutes ? Or am i wrong in that thinking

yeh it looks pretty gone . next time maybe go for a garden store compost mix. works just fine.
just wait it out and the buds still might mature. my first ever grow i completely nuked a plant. still got bud at the end

Halloween comes , you guys get any special plan ? ??

It is still getting some new growth so reallllllllly hoping it pulls through....and halloween is indeed coming LOL just take the kids out and stress about my dying plants LOL you?

Still hoping someone might be able to point me in the right direction what specific deficiency/excess that may look like im leaning more to a nute burn and im guessing consensus is go with just straight ph'd water

could you gently remove the top ammendments without disturbing the roots too much, then flush thoroughly with ph water to try and remove excess salts?

i already told you . dont water with epsom salt

puffdatchronic said:

i already told you . dont water with epsom salt

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I know thank you appreciate the feedback trust me no more epsom. Kinda got the what NOT to do next just trying to decide next best step to what to do .. tea or straight water and possibly diagnosis to better prevent future issues. Really hoping i can save them but life lessons i guess

lol ok its kinda feeling like you want a better answer , and if its out there i hope you get it so i can learn to. but ive been doing this a decade and im almost positive you have fried it with epsom, best way forward, plain water till harvest.
not sure about the top dressing situation as only you know how hot you made it, that being said, its likely to have worked its way in now anyway so again , just water till chop.
going forward id suggest, going with a standard medium strength all purpose potting mix, or if your keen on making your own google search "subcools super soil recipe"

Thank you much appreciated

Classic example of plants being overfed, showing issues, and the grower adding even more stuff to try and correct those issues.

"The overfeeding of any plant food can cause nutrient deficiencies."

I would also look for root disease and fungus gnat infection. Look for small flies around the base of the soil. If you see any at all add beneficial nematodes right away.

Whew, where to start. Perhaps over?

Mxer.
Sorry to hear..tough lesson most growers have to learn the hard way when they start
Hopefully some damage control can salvage something here, but burning looks pretty serious..I read some good advice here though.

To summarize..the excessive nutrients have made your soil toxic to the plants..you need to flush them (reverse osmosis water)...If you have enough perlite in the soil you can probably give them a second flush back to back..use your judgement as too much saturation of water can start rotting roots...remember plant is now shocked and likely not uptaking nutrients and water like normal.
Second, you'll want to do some defoliation of the burned fan leaves..you need to get some light penetrating into the canopy to absorb energy...Try not to overdue it..once the plant is in flower and the fan leaves are burnt you get backed into a corner as the plant is now putting energy into buds not new leaves..

Otherwise, fingers crossed hopefully you see the plant stabalize in a week or so..unfortunately your crop will likely be compromised both in terms of quality as well as harvest.

Best of Luck

Toad

puffdatchronic said:

best way forward, plain water till harvest.

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that and microbes then you know what you did before and what happened after then you can analyze the results easily against what you did and learn from it. Not on the microbe bus you better do some research then.

Also do you water to run off are you lazy and just let the pot sit in the run off swill or do you shop vac the swill out of there?

I tell youz all the same thing go on the youtube type in harley smith watch all those videos a dozen times, watch videos with good growers that crush it copy some of the practical things they do = success