Opinions Needed Please (See Pics)

So I'm on day 39 of flowering with these Lemon Drops, running CES (6 part line Micro, Bloom, Grow, Plant Amp, Mag Amp, Uncle Johns Blend) at about 720ppm (its down to about 600ppmn from the last feeding on Saturday, just replace with PHd water). Running at 6.0ph. 2 Plants in a RDWC with a scrog about 40"x by 26".

Its a 600 HPS, but the room temps dont get above 84 ever, and below the canopy stays at 77-79degrees with lights on. The rez is chilled to 66 degrees as well and I supplement with CO2 (yeast & sugar).

Edit: There is a dehumidifier in there that keeps it between 45-50% RH

I'm concerned about some of the leaves up top cupping.. I'm thinking this is due to heat stress (see below in pictures), but I'm just trying to make sure its not a sign of a deficiency.. the stems are getting a red-ish hue, but this strain has done that the times I've grown before in soil towards the end as well.

The first picture shows the whole grow, 2,3 and 4 show the leaves in question.. and 5 in a picture of some healthier looking leaves (with better camera hue) haha..

Thoughts? Thanks!

It could be heat stress. I had a similar issue with flood and drain in coco. I had bacteria growing in my reservoir causing pH to drop quicker that it should in a stable system. I added 2 ml per gallon of 3% food grade hydrogen peroxide (peroxide is found in nature if you read about it) and about two days later the leaves started to uncurl.

Just what I have seen, I will say my leaves were a little more curled though and I know for a fact pH was the main cause.

Hmm, its hard to get a look at the roots, but I do seem to have a little bit of red stuff on the roots that are not submerged.. the roots in the water look white as can be though, but after reading on H202 more it doesnt seem like 2ml/gal should do any harm, some places considered it 'fertilizer' for hydrosystems.. hrm. Haha

tennisstoner said:

So I'm on day 39 of flowering with these Lemon Drops, running CES (6 part line Micro, Bloom, Grow, Plant Amp, Mag Amp, Uncle Johns Blend) at about 720ppm (its down to about 600ppmn from the last feeding on Saturday, just replace with PHd water). Running at 6.0ph. 2 Plants in a RDWC with a scrog about 40"x by 26".

Its a 600 HPS, but the room temps dont get above 84 ever, and below the canopy stays at 77-79degrees with lights on. The rez is chilled to 66 degrees as well and I supplement with CO2 (yeast & sugar).

Edit: There is a dehumidifier in there that keeps it between 45-50% RH

I'm concerned about some of the leaves up top cupping.. I'm thinking this is due to heat stress (see below in pictures), but I'm just trying to make sure its not a sign of a deficiency.. the stems are getting a red-ish hue, but this strain has done that the times I've grown before in soil towards the end as well.

The first picture shows the whole grow, 2,3 and 4 show the leaves in question.. and 5 in a picture of some healthier looking leaves (with better camera hue) haha..

Thoughts? Thanks!

View attachment 3284143 View attachment 3284146 View attachment 3284149 View attachment 3284150 View attachment 3284151

Click to expand...

Id say heat stress for sure. Is that 600hps in an air cooled hood? I was running my 4 1000w room with the temp probes in the middle of the light at canopy level reading 84 and my leaves would curl like that. I run it now at 78 and my plants seem so much happier and use the water a bit slower(their in soil).

Yeah its just a bare bulb with a reflector over it, but I attached a CPU fan to the end of the reflector to help move the air out, as well as having a clip fan blowing up at the light, one blowing across the plany canopy.. a dual exhaust window fan blowing in under the canopy and 3 more fans under neath circulating air.. and then two small inline fans for ducting with some DIY carbon filters, one pulling air up, one pushing air out..

I'm thinking Heat Stress too, it just hasnt showed any signs till the last few days, after the stems started showing a little red..

Just for precaution, I double checked them PH, brought it up from 5.91 to 6.15 in case Mg or Ca were being locked out..
And I added some H202 to the rez to hopefully clean out any bacteria growing..
Raised lights like an inch and added another fan blowing up through the canopy bringing cold basement air up...

They still look healthy otherwise.. but the cupping has not gone down yet.. Hrmph..

I was also under the impression that you want them using water quickly so they can move more fertz through their system?
As long as you keep the RH in check that is to prevent mold?

I feel like since my shit is so close together mold could be a real issue so thus the dehumidifier.. that raised the temp in the room over the last few weeks since running it a little more often.. I suppose that could be the culprit..

Here's another look of the issue from today.. any suggestions?
This is day 41..

That's some pretty gnarly looking stuff, what strain is that? Yes it is mildly heat stressed, but i think you will be fine. You said your res is chilled? Are you using a chiller?

Thanks ODanksta..
Yeah i have an aquarium chiller i got used for $80

It's lemon drop supposedly from a bag of it i got last year.. only saw it that once and only had one seed..

It's definitely hybrid.. stretches a lot on the flip.. but finishes under 60 days.. Well smaller plants did.. there's only 2 in there so it may take longer lol

You are experiencing a magnesium deficiency.. And ph issue.. You need to lower your ph down to 5.6-5.8.. You also need to increase your calcium and magnesium.. The leaf cupping your are so seeing is from mag deficiency and the twisting of those upper leaves you see is caused by both the mag deficiency and the ph problem.. You want to have your water in your hydroponic solution to fluctuate between 5.6-6.0 because different micro and macro nutrients get up taken at different ph levels.. You should also be running alot higher ppm's at day 39 in flower.. Somewhere around 1100-1200 ppm.. Depending on strain you could be less or higher but 600-700 is definitely not enough that's part of your problem.. I don't know what you do for topping off evaporated water but that's also very important and will swing both ph and ppm levels and cause lockouts very easily.. BOL cheers

Oh also you can run lower levels of ppm in hydroponic set ups but even 600-800 during peak bloom periods is very low and I guarantee that's causing a majority of your issues!! Hope this helps..

PK_Boosted,
Thanks.. I dropped the ph to 5.7, thanks for the advice... When you say somewhere around 1100-1200 would you mean a EC value of 2.4, 1.9 or 1.7? My EC reading is on a .5 scale so its around 800 ppm but EC of 1.6.. which on a .7 scale would be ppm of 1120... Sorry I didn't state my EC earlier, ppm is so crazy with people having different meters and such..

As for topping off, I made an ATO that pumps in PH'd water when the level drops an inch or so below where I set it, works out pretty well DIY sump pump switch

I was trying to run CES around 1/2 of their full strength as I had heard that it runs pretty well there if you use the full 6 part line.. but I didn't get to add the Calcium supplement until later on into flower, so it might not have soaked up enough in the beginning and now its showing?

Anyway, thanks for your help, everything is appreciated!

Ahh I honestly don't know the EC scale I use standard truncheon ppm readings for all my stuff never even checked EC levels I am not familiar I know they can be confusing depending on the scales they are at which is why I stay away from using them.. Find it easier to use ppm readings I use a blue lab truncheon and ph meter they are the best..

Yah I've heard good things about Des nutrients don't know great deal about them as neither myself or anyone indirectly know has run them but I got customers that swear by that stuff.. Your at like week 6-7 correct forgot what day you were on.. I would say that 1200 ppm range sounds like a good mark for what week you are in..

Problem is that idk what ppm are making up your water lol I'm not familiar with those nutes and what I mean by that is idk if you got u know 15 ml/gal of cal mag and that's making up 600 ppm of your solution.. Ppm and EC readings are only good to know if I know what values of nutrients are making up that mixture of 1200 ppm you get the drift..

At this point in your grow you can cut the cal mag off you don't need to run cal mag after about week 5 in bloom you should be fine reason being you don't need any of the added nitrogen in your nutrients at this time either

Yeah having an ATO in a hydro res is absolutely critical can't tell you how many horror stories and peoples setup I have fixed over the years who were oblivious to topping off coming in with all sorts of problems not realizing their ph and ppm spiked through the roof

I have a few great tips and techniques to reduce stretching.. You always want your plants to stretch anyways unless you have height restrictions.. The stretch phase of bloom is very important in establishing critical budding site formation and revving up energy for your plants to focus on producing more flowering sites there's nothing wrong with a little stretch.. Sativas stretch a lot more than indicas and that's just the genetic makeup of your varieties.. Stretching also is a great sign your plants are gearing up to begin flowering it's my favorite time watching them stretch and begin to cluster up their top shoots ... Ahhh it's a beautiful thing

Hey I have taken some close up looks at your pics you need to back off on your nutes man you are getting burnt tips and cupping of your upper branches i would def go to a nice water feeding and maybe just run cal-mag and half strength of your bloom enhancers no bases for a feeding or two.. What's your run off ppm right now? And how close are those lights.. You having high temps in there? I see a few things you may want to adjust to stop those flowers from clawing and cupping like that right now.. Lemme know those parameters if you got a chance

The Rez is around 785ppm on my reader (.5 scale), but on a truncheon scale that would actually be around 1100ppm (truncheon uses a .7 scale)
I had temps that got up to 84 a week or so back, but nothing lately, its been nice and cool in there around 79 with 43 RH...
Lights are about 12 inches away, maybe 13, but I can hold my hand there without it being hot at the canopy level..

My bloom schedule..:
All Cutting Edge Solutions:
Bloom is 0-6-5 I use 10ml/gal
Micro is 6-0-0 I use 4ml/gal
Plant Amp 1% Chelated Calcium 5ml/gal
Mag Amp 2% Mag, 1% Sulfur 5ml/gal (this could be backwards, gotta check, but i think its 2/1)
Uncle Johns Blend 0-0-2 5ml/gal

tennisstoner said:

So I'm on day 39 of flowering with these Lemon Drops, running CES (6 part line Micro, Bloom, Grow, Plant Amp, Mag Amp, Uncle Johns Blend) at about 720ppm (its down to about 600ppmn from the last feeding on Saturday, just replace with PHd water). Running at 6.0ph. 2 Plants in a RDWC with a scrog about 40"x by 26".

Its a 600 HPS, but the room temps dont get above 84 ever, and below the canopy stays at 77-79degrees with lights on. The rez is chilled to 66 degrees as well and I supplement with CO2 (yeast & sugar).

Edit: There is a dehumidifier in there that keeps it between 45-50% RH

I'm concerned about some of the leaves up top cupping.. I'm thinking this is due to heat stress (see below in pictures), but I'm just trying to make sure its not a sign of a deficiency.. the stems are getting a red-ish hue, but this strain has done that the times I've grown before in soil towards the end as well.

The first picture shows the whole grow, 2,3 and 4 show the leaves in question.. and 5 in a picture of some healthier looking leaves (with better camera hue) haha..

Thoughts? Thanks!

View attachment 3284143 View attachment 3284146 View attachment 3284149 View attachment 3284150 View attachment 3284151

Click to expand...

u have the claw 2 things well 3 lol how hot ? u may have over ferted a bit like i get somtimes or have u used anything with high potash in it that always dose the claw to mine

Here's some more pics from today.. Not much change in leaves, buds still growing though.. Some shots from under the canopy too..
Thoughts?

Also, PK_Boosted, heres a chart for EC to PPM with different meters.. Mine is the .50, yours is .7 truncheon right?

Some more pictures from today.. which is day 47 since the flip to 12/12.. Day 37 since I noticed new pistils forming.. Not quite sure how long I have left, I'm thinking between 1-2 weeks.. thoughts?