DWC help needed - leaf problems getting worse

oijakeio

Member
growing for over 2 years in soil with perfect results, switched over to dwc and im having problems again. second dwc grow now and the first was one had terrable results (1.5oz yeild) when i was doing it in soil i was getting 4-5oz yeild per plant,

first time round i got issues mid flower, first i thought it was light burn (moved the light further away) still getting worse, then i thought it was root issues, wasnt that either, then thought it was a defficiency but it was to far gone by that time so i just let it ride and seen what came out at the end.

—heres the issue im having now—
flipped one plant to flower 12 days ago, and now i started getting the same issue in both tents? the leaves have started to brown/yellow on the edges woking the way towards the tip but not on every leaf, im guessing its a phosphorus or potassium defficiency? can some help diagnose the issue and help with correcting it?

my ppm keeps rising the more water that is being drank, i put 13l of water into the pots mixed with nutes (comes to about an inch or two below the netpot)

flower tent
7th january ppm was 1300
9th it went to 1640, added 5l of water mixed with 5ml of bloom and it brought ppm back to 1200,
today 10th january 1250ppm
326BF57E-0BB4-4C31-8757-9B8CBA65A3D5.png7E7BD9FD-DADC-4A33-A1C3-D19C0F048A12.jpeg0028490C-698B-49F3-8EA5-8845E5CE770B.jpegAB81BFAC-C98C-42D4-8987-996AE0455BD2.jpeg139DDCDE-5123-4CFE-AB1D-5433BF824A14.png5B5EB8B6-4368-4A99-99C4-CB7353A93DAC.png


veg tent
6th january ppm was 1090
7th january ppm was 1200
9th jan ppm was 1400, added about 3.5l plain water, brought ppm back to 1030
today 10th january ppm is 1080
4C29A6E3-DC4F-4301-B694-8693A1782A36.jpeg03916DA8-18F6-482C-A2AF-98B930367438.jpegFDB66E6F-DD00-4DE7-92E5-F04A715989D3.jpeg

veg tent
2x4x4
mars hydro ts600
temp 20-23c
root/water temp 19c (normally)
humidity 60-70%

flower tent
2x4x6
mars hydro tsl 2000
temp 22-26c
root/watertemp 19-20c (normally)
humidity 50%

nutrients (all following manufactures recomended dose)
ghe tri-part (see image for dosage at each stage)C2D2231B-EDD0-4119-A82D-4A979EBF9E79.png
ghe bloom booster 3-5ml/L
ghe ripen (not used often) 4ml\L if it is used
ghe flash kleen (florakleen) 2-3ml/L (flushing)
canna calmag 1ml/l
shogun silicon 1ml/l
silver bullter (roots) 6ml/L when in mid-late veg



both tents constantly PH checked and maintained at 5.7-5.9
both tents have good ventilation and airflow
all pots have 2 air stones in them so plenty of oxygen
 

myke

Well-Known Member
Just use the 3 part and calmag nothing else and drop the strength to half of what the bottles say.ppm should drop daily,slowly up the food until ppm stays the same in one day.Now you now how much food she needs.Back that off just a little.
 

oijakeio

Member
Also give her a good flush of straight water for 12-24 hrs to rinse away all the extra shit.
okay ill try do that, should i not use the silverbullet also? just keep a sterile pot?, and ill give her just plain ph’d water until tomorow morning then try half strength tri part woth the calmag, but if its a deffieciency would it not get worse by just giving it water and not the specific nutes it needs? (im still really new to dwc)
 

myke

Well-Known Member
okay ill try do that, should i not use the silverbullet also? just keep a sterile pot?, and ill give her just plain ph’d water until tomorow morning then try half strength tri part woth the calmag, but if its a deffieciency would it not get worse by just giving it water and not the specific nutes it needs? (im still really new to dwc)
Plenty here grow with just the regular nutes,for a flush you may have to fill and dump a few times,ppm meter will tell ya.This gets you to square one and start there.Yes continue to use whatever you have to keep it sterile.
 

Hollatchaboy

Well-Known Member
okay ill try do that, should i not use the silverbullet also? just keep a sterile pot?, and ill give her just plain ph’d water until tomorow morning then try half strength tri part woth the calmag, but if its a deffieciency would it not get worse by just giving it water and not the specific nutes it needs? (im still really new to dwc)
Deficiency is most likely from lockout due to imbalance. You need to clear the rootzone of salts first. Hence the flush. Then return to feeding. @myke Knows his shit and has solid info.
 

oijakeio

Member
Get a water quality report from your water company if you have city water.
found this from 7th jan 2022 but ive got no idea what it means
 

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rkymtnman

Well-Known Member
way too much going on in your reservoir in my opinion.

you can have a great grow with just the 3 part, cal/mg (if needed) and the silver bullet for the roots.
 

myke

Well-Known Member
You cut off the calcium in one pick it’s right on the edge. Magnesium is low. Assume calcium is also.
Water looks good. You could add 60-80 ppm of Mg to your water with Epsom. Then you don’t need calmag.
 

oijakeio

Member
just a quick update, gave her a flush for 24 hours, then added half str tri part + half str calmag, + silver bullet, ppm was 698, checked today ( roughly 16 hours after i added nutes) and ppm has risen to 706, is this okay

(its only a cheap tds meter so might have some fluctuations between reads),
ph rose to 6.56 but i adjusted it back to 5.78

ive taken pics of some affected leafs now and will compare them to the plant in about 10 hours, hopefully this has fixed my issue,

each feed ill up the dosage a little but of the nutes until i find the right balance, next feed should i give 3/4 strength an monitor the ppm? or is to big of a iump from half to 3 quaters?

my thinking behind it is if the ppm rises after 3/4 str nutes then my sweet spot will be somewhere inbetween 1/2 and 3/4 strength?
 

Hollatchaboy

Well-Known Member
just a quick update, gave her a flush for 24 hours, then added half str tri part + half str calmag, + silver bullet, ppm was 698, checked today ( roughly 16 hours after i added nutes) and ppm has risen to 706, is this okay

(its only a cheap tds meter so might have some fluctuations between reads),
ph rose to 6.56 but i adjusted it back to 5.78

ive taken pics of some affected leafs now and will compare them to the plant in about 10 hours, hopefully this has fixed my issue,

each feed ill up the dosage a little but of the nutes until i find the right balance, next feed should i give 3/4 strength an monitor the ppm? or is to big of a iump from half to 3 quaters?

my thinking behind it is if the ppm rises after 3/4 str nutes then my sweet spot will be somewhere inbetween 1/2 and 3/4 strength?
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