I need HELP, wtf is going on??!!

Hey guys, I've been growing rockwool dtw for a couple years (growing over 6+ years overall)

It's great and I've always done very well, my home setup always looked perfect. I fed 0ppm ro water with 100ppm calmag (.2ec) and 600 total ppm after a/b (1.2ec)

I feed this throughout... plants always looked PERFECT

Now im in a new large facility is its been a little learning curve since im growing WAAAAAY bigger plants bc of plant count limits.

And now in stacking 6x6x6 blocks on unislabs (go on slabs first day of flower)

.... well plants have always struggled, always seeing deficiency. Even seeing some deficiency on certain plants in early veg. . I'll post those pictures Monday of the veg plants

Im now using dosatrons with ETATRON Eone microdoser for ph

I am doing 150ppm calmag (.3ec) and around 700-900ppm total (1.41.8 ec) in flower

I was using way too much ph up... learning curve of using the etatron micro dosers‍‍

Runoff ph is around 7.0 and I've run a shitload of water through them and can't really get the runoff ph down... guy at grodan said don't focus on runoff, but im thinking that's my issue??

Anyways here are the plants... this shows some deficiency, whaaaat do you think it is??? I'm losing my shit trying to figure it out. I just started week 5 flower, these pics were prob taken at 32days flower...

THANKS!!!!!

oh yeah im now using co2, de lights... before I used no co2 and single ended lights

I thought it was over feeding (was feeding 1400ppm/2.8ec) so lowered to 700-900ppm (1.4/1.8ec)

When I noticed the high ph runoff I lowered the nutrient ph to 5.5/5.6

Now I'm seeing alot of leaves yellowing with purple stems on the leaves, then leaves drop off /pull off very easily at week 5 of flower.

Any ideas????

I just upped my irrigations +100ml on each shot so hopefully I get more runoff and correct the issue with the new ph and lower ec???


... in the last week since I lowered ppm and ph im noticing more and more leaf yellowing where eventually they pull off with almost no effort (but maybe this is bc the phin the block at 7.0 runoff is causing lockout???)

I'll have more pictures of everything Monday through the hps sunglasses so you can see colors and get a better picture of what's going on.... buds look dank AF though and huge for only day 35 but obv things could be better if leaves/ plants aren't perfect

Looks to me like straight up lockout from Ph being too low.

Even through runoff is coming out at 7.0? ... think 5.5 is too low and I should get it to like 5.6/5.7?
@Airwalker16

I don't grow hydro but i believe ph hydro range is like 5.8-6.5?

maybe look into your nutrients, make sure ur using hydro specific nutrients and good water, this is your baseline. after this you can adjust pH and track down the problem

also maybe check the PPM runoff to be able to tell if salts are built up in the medium?

Slimjimham said:

Even through runoff is coming out at 7.0? ... think 5.5 is too low and I should get it to like 5.6/5.7?
@Airwalker16

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Or they could be too high. Is this the same style you used with years of success?

The ONLY differences are I'm using DE lights WITH Co2 and MUCH larger plants (because of plant count limits) with dosatron system and I put plants on unislab first day of flower


I used to feed 100ppm calmag (.2EC) and total with A & B was 600ppm (1.2EC) @ 5.8 ph

so on advice from grodan I upped the ppm alot (1400ppm or 2.8 EC) and the learning curve with the dosatrons where although ph was 5.8-6.1ish I was putting in ALOT of ph up... like ripping though gallons (thought I just had really low ph water at the new spot.... but im also on a new well so maybe whatever was causing low ph flushed out... but doubtful)

My plants looked perfect, like big dick swinging perfect ha.... now im fucking embarrassed if anyone goes in the room.

I think it's maybe a combo of salt buildup (grosens says its around 2.4-6.0 in the block depending on strain but with the dryback getting down to 10% overnight the EC spikes off the chart) but I've tried to flush and it doesn't seem to be lowering the ph runoff of 7.0 or change the overnight ec spike

I've got people telling me I should be feeding 1.8ec with .3 of that being calmag.... this is basically what I'm doing‍

Hit me with some more ideas as to what's going on... more pictures coming tomorrow

Slimjimham said:

used to feed 100ppm calmag (.2EC) and total with A & B was 600ppm (1.2EC) @ 5.8 ph

Click to expand...

i'd go back to that. and feed twice a day. with 20% runoff.

pics are hard to see but you got tip burn for sure=too high EC

and i wouldn't be surprised if all the pH up you're using is causing problems too. maybe adjust pH by hand until grow is over?

Mag problem or iron from what I see off the bat. What cultivar are you growing?