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I built a 200l deep water culture(DWC)
Equipment:
Torus Hydro PH controller
Bluelab Guardian
Drain pump
400w Heaterstick
4x airpump (JBL A150)
Nutriculture XStream (12er) for the first 3 weeks
Start of the week:
Germination inside the rockwool cubes with 99% RH and 23°C
1 seed germinated but i sadly killed it while giving birthhelp...i hate myself..
PH 6.0
EC 0.3 (only added cal/mag)
End of first week:
Ph 6.0
EC 0.7
They look quite good....roots grow like hell
Added completely new water at the end of the week, added EC 0.4 calmag then hesi grow till EC 1.0
PH was 6 without adjusting..
2 died, 2 new just got born midweek...
1 more week in the xstream then they'll get transplanted into the 200L pot
Transplanted all to the final pot on day 21
Adjusted EC to 1.1 and PH to 5.9
Watertemp is 20°C right now
I let the TorusHydro sit in clear water for 3 days to flush it for first use...it's now added to the big pot
Set lights from 24/0 to 20/4
I toped most of them on day 22
i come to the conclusion that i had/have a quite severe N toxiticy...
i refered to the RQS website that says "seedling : 400 - 500 ppm , 1.0 - 1.2 EC" -> i adjusted EC to 1.1 and didn't check PPM..
N tox symptoms arrised...
https://www.royalqueenseeds.com/blog-cannabis-water-quality-part-2-ppm-ec-n298
a few days later i switched to PPM which read 740 ppm...shocking...why was EC 1.1 = 740?? i read the description the bluelab guardian and i says PPM = ECx700, so EC 1.0 = 700 ppm...
why does the RQS website say EC 1.0 - 1.2 = 400-500ppm ??? does anyone know?
strange thing...anyways: now i removed alot of water and refilled with pure RO water and added a few mL of root complex and powerzyme
damn PPM mistake cost me a whole week of veg...growth was very slow...usually i wanted to go for flower by end of next week but now i probably need to add another 2 weeks veg
i added the 3rd light at the end of the week, so now with nutrient problem solved i hope for explosive growth next week...
Another week of failure...
First i found a construction light leak then i found the real source of the stunted growth: underfeeding...i increased EC from 0.6 to 1.1 and growth was exploding + drooping stoped...i adjusted it to 1.2 at the dnd of the week...but i think they could handle 1.5 easily..
Only good thing to report this week: this won't happen again next grow
PH is rising alot over 24h i try to adjust it to about 5.5 every evening but a day later it's at 6.5+...never over 7 tho......
possible reasons:
water oxication,
plants drinking/growing,
torus not working properly(perhaps too weak pump),
algae growth due to 2 weeks of light leak
If you have any suggestions please don't hesitate to tell me...
1 plant won't make it...i think it was a root problem since birth...
Defoiled & replaced 60L with fresh RO water
Will do a complete refill with bloom nutes next week
Set up the 4th light (sanlight q3wl) + set UVA to 5h a day
Switched to 12/12 at the end of the week
Fully exchanged the NS on D47 due to several deficiency symptoms...mixed nutes 25% grow/75% bloom
Did some heavy defoilation on D49, everything that put shape on something else had to go
Removed the slow growing plant...didn't grow for 2 weeks
No burn symptoms so i increased UVA from 5h to 6h a day..
PH is rising steadily over 24h...sometimes over 1.5 points...
I keep recalibrating to 5.5-5.8 but after 24h it's at 6.5+ again..
EC was too high after exchanging so it kept in rising...i replaced 40L again to set EC to 1.3 instead of 1.9
This week i had to lower the PH alot...i left it around 5.5 and 24h later it always was around 6.0-6.5 except from thursday to sunday...
on thursday i left it at 5.0, friday it was at 5.7...then strangely it droped to 4.9 from FR to sunday...
EC was 1.3 all week(sometimes it lowered to 1.2)
had to refill 40L over the week (including full strength nutes)
Defoiled a little a few times this week, next major and final defoil will be next friday
Strangely i see no signs of bud yet (day16 flower) usually i see light budsites after day 14...
stretch should be over soon...they all stretched almost 100% over the last 14 days
It was a good week, PH stayed within a good range without me adjusting it...i just refilled the lost water with full strentgh NS which lowered PH slighty
I think stretch is over now
I did some heavy defoiliation on day21F, i removed ALOT of leaves and lolipoped all lower branches
My only concern now is the low rate of budgrowth...today is day 23 and they look like day 13 flower...
Today is day23 of flower and budgrowth looks like day10
They started to stretch right after i switched to 12/12, till now all gained about 130% height...
What could have caused this?
No light leaks,
PH 5.5-6.5,
RH +-60%
EC 1.4 (bloom nutes)
I see happy flowering Girls, Ansd she may take longer to di Flowers, thats the variations of the different Strains
iam very sure shes stacking up nicely the upcoming weeks
It started a week ago (before defoiliation)
...the lower leaves were lifeless, hanging and just died a few days later...now all branches hang lifeless...not yellow, just lifeless...
The 2 plants next to it look good
I think it's a root problem? but i can't check roots anymore..
The good looking branches are from the plants next to the dying one...
The dying plant is still getting alot of light....there's a Sanlight q5w (230w LED) just 40cm above her
Looks like lack of light to me. But maybe another grower can give you a better explanation. the other bud sites look normal so thats strange. Dunno stumped me maybe just a bad plant. I grow dwc too and can say It does look like this in the lower branches I just trim it off cause i fear it could stress them into herming maybe im just paranoid lol
I did't exchange water for 3,5 weeks and learned: that was bad! =(
Plants looked good on sunday morning...monday D66 i found alot of burned tips, so i exhanged water immidiately...but damaged was caused...i think rootrot spreaded...
I put in peroxid for 2 days...which i think stoped the burning of new growth...
Today new growth looks good again...but i think i lost quite a few buds...some branches look very burned and almost stoped growing...other do great again
I removed 1 plant on friday...i was almost dead whole week...roots looked brown and slimy
All in all i'm still 1 week behind in flower...there should be alot more buds right now..
I'm inserting some beneficial bacteria to prevent and fight further rot + i'll try to fully exchange water every 2 weeks now
I raised EC to 1.5, then a day later there was a big drop in PH so i did a complete refill on D75F33 and calibrated EC back to 1.2
Added some PK boost
Inserted myco-max from the-nutrient-company on saturday...loads of beneficials in it
Buds coming along but look like 2 weeks behind considering it's end of week 5 of 12/12
The light is too close bleaching your leaves :) if not then it would be an lockout from an overfeed they are my best guesses hope someone else can shed more light on it :) 👊 yes it could be a root problem being a dwc grower signs like this can occur if there are any malfunctions in air stones or pumps meaning the roots are not getting enough oxygen :) give her a flush for a few days and see how you go :)
Replaced NL on D84F42 (1.5 weeks since last full exchange)
Still about 3 weeks behind... today F44 they look like day 21 flower..
Never had such big plants tho..i still hope for the best...
They produce ALOT of resin...there are some big fan leaves that that have resin on them...didn't see something like that before
root rot seems to fade away, looks like the little microbes are helping...
Did a half rez change on day 91(49 Flower)
EC was stable at 1.5 whole week, but PH lowered about 0.3 each day...i put it to 1.3 and PH to 6.0 after i half changed rez...
2 days later PH droped to 5.3 again..
i raised EC to 1.9 at the end of the week, let's see what happens...
Still 3 weeks behind in bud development...
I held EC @ 1.9 whole week
PH was droping 0.5 every day, adjusted it to 6.0 everytime it droped
Exchanged whole rez on sunday D100F58
Put in Peroxid after rez change to get rid of rootrot...will add back beneficials on monday evening - 30h after adding the peroxid...
Bud growth is slow and strangely looking...but it grows and i think i'll get overally 'ok' harvest...not good but 'ok'
As they look like day 35 of flower (even they're on day 58) i'll give them 4 more weeks till harvest
Again a strange week...i exhanged water completely on last sunday...3 days later i had a huge PH drop (from 6.2 to 4.2 within 24h) PH droped 0.5-1.0 every day but that was a 2.0 drop within 1 day, EC raised slighty 0.1...because i didn't have enough nutes i exchanged half rez and adjusted EC to 1.7, PH 6.2
I think it's the rootrot that causes the PH drop, from now i'll only fight it with H2N2 till harvest...meaning i'm putting in a slight solution of peroxid every day till harvest
Bud growth continues slowly but i see growth...which makes me hope for an average harvest..
3 weeks to go
Roots don't look good...very ugly actually....I added 300-400ml peroxid everyday to stop the root rot
Buds keep coming
Replaced whole rez at the end of the week and filled with only RO water + cal/mag + Shogun DragonForce
2 weeks to go...next week only water
Colors are coming
Exchanged full rez and only inserted shogun dragon force @ EC1.9
Inserted 400ml peroxid every 2nd day, Roots still look bad but not worse....i think the peroxid will help me keep the root stagnant till harvest
Trichomes look almost ready
1 week to go
Flush Week, only RO water --> harvest at the end of the week
Ec at 0.2 & Ph stable at 6...slighty lowering at the end
Plants are turning quite purple...but i have no huge difference in day/night temperatures so no deep purple ones..
It was an bad 1st time DWC grow...learned some lessons the hard way..
Outcome weight is not very good but it's smokeable sticky stuff and i got alot of Hydro XP