Sad droppy plants

[KonopCh]

I pulled this off the Web

cannabis Plants With Root Problems Show Many Symptoms

• Cannabis may appear overwatered or droopy
• Curling or cupping of leaves
• Wilting - either individual stems wilt or the whole plant may wilt
• Slow growth, or staying very small for weeks
• Leaf yellowing, or sometimes even other colors like purple or red
• Brown spots / Burnt spots
• Other strange nutrient problems
• Brown or slimy roots - this is often a sign of root rot
• Smelly runoff water (smells rotting or musty)
• Leaves may start dying and falling off rapidly
• Plants drink much less water than usual

Yea, I was thinking about overfeeding/overwatering (but I guess it's impossible with coco/perlite and autopot). Also overfeeding would cause burn tips, so this is no go.
I lifted pots and there is almost no roots because I use root control discs. Some tiny roots are there but they're white and no smell or I don't smell it because plants are in flower mode so I smell that aromas.

Root rot? I use airdomes, so pretty much air in there. Also temperatures in tent don't go over 27°C most of time, water in reservoir is under 20°C (outside of tent).

I really don't know what is wrong here... Maybe too low temperatures?
Strain is more sativa dominant.

 

[Arthur]

Hmmmm, I'll keep thinking on it...

 

[MedGrower]

I think @Waira is correct here as for the P defiency. Just my thought that it may also play part on the droopiness of the plant. I mean perhaps the intense light so close has increased the demand of both Mg and P so much that the plant is basically depleted of energy and she is tired. I'd back out with the lights even more if I could and give her more P and Mg.

What is the strength of the solution you are giving to her? Overfeeding would result in loss of turgidity that would explain droopiness also but with deficiency symptoms it would be unlikely and as you rightly pointed out, the tips of the leaves would also be "burned". I wish I could be more help! Best of luck bro! I hope you get her back pushing it strong!

 

[RicanBlazer]

Two of mine are having the exact same thing so I will be following closely. I was thinking cal/mag as well so I upped it some for the next feeds, hopefully that works.


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[Waira]

...hmm, what's the RH% Knop'? ... I'm wondering, like Med mentioned, if the lights are too close given their intensity, even at 40cm....not for heat, but sheer photon blasting, which can still stress the plant in similar ways as heat,... is it still progressing since you raised the lights? .... can you get me some normal light pics mate? I want to see the true color,.. all that N going in, no carbonates (buffering), and maybe not enough P still,.. what PK booster and dosage? I know the droops look bad, but the bigger concern is the necrosis,... I've had plants that drooped, and never reshaped well after that but did fine, so don't put much emphasis on that leaf posture,... also, what your res' pH is does not reflect what the actual in-pot pH is, too many influencing factors in there,.. you don't happen to have a quality pH probe, do you, since run-off is basically n/a!

 

[KonopCh]

RH is 50-60% when lights on. 60-65% when lights off @Waira.
They're okay now when I dimmed lights and raised them a little more. I think doopines was because too much photons. I didn't change anything, except lights.

Only Ca/Mg and PK deficiency now...
I don't want to overfed them in autopots, but I already giving them as much as I did in soil. But in autopots they feed everyday, in soil it was every 2-3 days.
PK is standard 13/14 and 1.2ml/L now.
Also Big bud (has PK 1/3) at 1.2ml now.

Accurate 8 works in coco too?

Here are pictures, they're sleeping now...

 

[Waira]

...hmmm, Konop mate, I think you have a micronutrient defc. starting, on those uppermost leaves, sugars too... you're getting that zebra-striping interveinal chlorosis that looks like Zn defc. to me, Fe more remotely... both are immobile within the plant, so it hits high first and worst,... you'll need a dedicated micronute supplement for this, and it's not too late to do foliar application too, by far the fastest and best way into there,.... I like Earth Juice Microblast... a wetting agent is critical too, so is spraying tops and bottoms of leaves,... Unless you have Optic Foliar Transport handy, combined with micronute supp', will sort this out if short order!
- sweet! yeah, A8 is perfect for coco as well,... What's the in-pot pH? Zn, Fe and some others lock out fast by 7.0 in soil, though in coco, I'm not sure how much difference there is? Just a check will be good, might be this is a simple lack-of, not a pH issue,...

 

[KonopCh]

Thanks @Waira!

 

[Rapha El]

The drooping could just be them wanting to sleep. 16-18hrs/day is a normal cycle for ruderalis, depends on what specifically it was crossed with. So to me it looks like a good way for you to save some energy.

As for your calcium deficiency.. is your humidity in check and is the ppm of the feed low enough and balanced? CA is only transported with water for transpiration, so if they don't suck enough they don't get enough of it. Too high RH ooor too high temps and a resulting ammount of water in the air? I found 13-15g/m³ a pretty good value.
Same if you have stuff like seaweed extract that adds natrium chloride and locks out calcium.. or if for some reason there is too much kalium.

May i suggest this video: