1500W LED DIY (Flood and Drain)(problemoz wif plantz)(need tips)(pics)

arcalion

arcalion

Well-Known Member
ok so i currently i have changed over to a flood and drain, i use rockwool 6inch cubes for the majority of my grow, i do 45 days from seed then transfer, the plants are wonderful but by the time i put them into flower and transfer within 2 days they go from praying to the sun gods to being droopy af and turning purple, i try to exchange the nutrients in the res, im currently at .8 ECs while changed to Flower nutrient regime but there still perking down and im getting rotted roots. i've cleaned the res i have it under 70F i've got a little bit of root excelurator in there and some Drip clean to help keep it sanitary. so far this has happened twice putting my plants into the flowering room. even with my soil grows they would do the exact same thing. i just dont understand, i just added AC unit so i no longer have heat problemoz.. any suggestion fixing this problem? What would you do? i also added a little bit of Cal-Mag to see if it would bounce from that, while remaining under 1.0 EC's
why is it so difficult for me to tell if its a toxicity or a deficiency
 

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arcalion

arcalion

Well-Known Member
the cubes also atleast dry out within 2-3days now, also i just took out some water and just added fresh water and brought the E.Cs to around 0.6 -0.8 ecs just i dont know how to fix this root problem
 
nfhiggs

nfhiggs

Well-Known Member
arcalion said:
heres a picture of my Afghan Kush Special/Pink Kush, its about 20ish days from Harvest, they also had the problem right from the beginning of flower. all kinds of deficiencies or w/e
Click to expand...
If you are seeing what looks like Root Rot, I would sterilize the rez with 1 tablespoon of bleach per gallon. It sounds to me like the flower setup has a pythium contamination in it somewhere, and its attacking the roots as soon as they go in. Are you using any beneficial microbes like Hydroguard or Recharge?
 
arcalion

arcalion

Well-Known Member
nfhiggs said:
If you are seeing what looks like Root Rot, I would sterilize the rez with 1 tablespoon of bleach per gallon. It sounds to me like the flower setup has a pythium contamination in it somewhere, and its attacking the roots as soon as they go in. Are you using any beneficial microbes like Hydroguard or Recharge?
Click to expand...
nah ive got Drip-clean i was told at the hydro store its basically the same thing, and ive tried recharge before it hasnt done me any good in soil, ive had the same problem. my PH in the res is 5.8, whats different between Dripclean and hydroguard? i could order it
 
arcalion

arcalion

Well-Known Member
nfhiggs said:
If you are seeing what looks like Root Rot, I would sterilize the rez with 1 tablespoon of bleach per gallon. It sounds to me like the flower setup has a pythium contamination in it somewhere, and its attacking the roots as soon as they go in. Are you using any beneficial microbes like Hydroguard or Recharge?
Click to expand...
is the bleach really going to be good for my grow with all the nutrients and everything? wouldnt that harm things?
 
Cx2H

Cx2H

Well-Known Member
SwiSHa85 said:
I've never done ebb & flow but that sounds wrong. People I know that flood drain usually flood twice or more a day.
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I used to flood 3-6x a day.

Those are hungry plants. That purple leaf sheet is P def. Needed grow nutes mixed with bloom first 10-12 days.

Min EC now should be 1.5ish and ramp up EC each week to a peak until mid flower then back down by finish to 0.6-0.8

#IMO
 
Randomblame

Randomblame

Well-Known Member
What's your humidity inside the room? Could be too low! It's a common issue with LED and temps around 80-84°F.

And how much light did you have per sft? High intensity levels(above 800μmol/s/m²) cause higher nutrient demands and especially under low humidity it's difficult to keep them healthy/happy.

I would dimm the light by 25% or hung it higher and I would try to keep my humidity around 60%. If they perk up again I would increase the brightness again but slowly.
 
M

MidWestMayhem

Well-Known Member
SwiSHa85 said:
I've never done ebb & flow but that sounds wrong. People I know that flood drain usually flood twice or more a day.
Click to expand...
Yeah if your only feeding that much, i'm pretty sure you need to be flooding multiple times per day. Watch them closely over like a Saturday and see what happens.
 
arcalion

arcalion

Well-Known Member
My plants just hit flower 2 days into flower they were fine then went to shit when they needed a flooding, am I suppose to be feeding even though the cube Is heavy?? I don't get how ppl flood 3+ days I have rockwool it's meant to hold alot of water.. my humidity is like 45%
 
arcalion

arcalion

Well-Known Member
Cx2H said:
I used to flood 3-6x a day.

Those are hungry plants. That purple leaf sheet is P def. Needed grow nutes mixed with bloom first 10-12 days.

Min EC now should be 1.5ish and ramp up EC each week to a peak until mid flower then back down by finish to 0.6-0.8

#IMO
Click to expand...
Ok should 1.5 ecs; with grow nutes and bloom?
 
Randomblame

Randomblame

Well-Known Member
arcalion said:
My plants just hit flower 2 days into flower they were fine then went to shit when they needed a flooding, am I suppose to be feeding even though the cube Is heavy?? I don't get how ppl flood 3+ days I have rockwool it's meant to hold alot of water.. my humidity is like 45%
Click to expand...

Too low, should be around 60% at 84°F! Below is a chart about VPD at different temps. It already factors in 2° lower leaf temperatures against ambient, as usual with LEDs. You can use it like it is!
If the vapor pressure difference inside the leafes is too high your plants transpire much more water, more water uptake means also more nutrient uptake, especially calcium and too much Ca blocks other elements like Magnesium, Iron and others. The results can look like a Mg deficit but you also see other signs of nutrient stress like purple veins, chlorosis and so on.
To avoid issues you can either use less nutes(25% too high VPD = 25% less nutrient strength) or you increase you humidity according to the list below.
I would use an IR thermometer to messure the leaf temps. Messsuring at ~20cm distance to the canopy should give you almost correct values you can work with. Usually the leaf temps are 2-4° lower than ambient temps with LED (blurple a bit more, with whites a bit less).

VPD Chart, Temps vs. RLF.gif
 
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