Light/heat burn and mag def?

[Destroyer of chairs]

Top growth is a bit discoloured and got "stripes" kinda, which I believe is lightburn.
Some other growth shows discolouration but dark veins.
Have a look:


Am I right? I really gotta be sure before flipping to flower.

 

[rmax]

Good pics!

 

[Destroyer of chairs]

Each growing area got 3x 240w qbs hanging 70cm above canopy.
Temps 25-27 at lights on and 18-20c lights off.
They are in late veg. Feed them everyday with 50% bottle recommended dose.
Coco/perlite mix in hempy.

 

[Destroyer of chairs]

Thinking of doing a foliar with epsom salt. Do I need to add wetting agent for this to work properly? Not really sure what is OK to use, normal dish soap?

 

[kovidkough]

whats your ph? are you using calmag ?

 

[Destroyer of chairs]

whats your ph? are you using calmag ?

I'm shooting for pH 5.8 and let it drift to 6.2 before adjusting anything.
I'm using 25% calmag bottle recommended strength.

 

[Destroyer of chairs]

Upped calmag to 33%.
I keep underestimating their drinking habits resulting in unhappy droopy ladies. Gonna take a pic later and feed them with the foliar. I don't have any wetting agent though but I'm sure it's fine.

 

[Destroyer of chairs]

Still some weird lookin leaves. Couple shots with growlight on and off, plus a closeup of the discolouration.

My only action so far have been upping calmag from 25% to 33% of bottle recommendations. Spoke with a gardening shop and ordered some kind of soap ment for plants. He told me I could use other sorts of soap aswell but ordered it along with some silica.
Didn't know that u can't get silica included in other nutrient blends cause it gets ruined. Knowing that I had to order some, considering my medium is coco/perlite. Read about foliar and figured it's no use if I don't break the tension so gonna wait with until the order gets here.. :'D

Please, if anyone see anything that might help me figure it out/closing it in on mag def/light burn, please share ur wisdom.

 

[kovidkough]

you can foliar feed Epsom salt 1gram per gallon it is magnesium and sulfur

 

[kovidkough]

or even just water it in aswell

 

[Destroyer of chairs]

I'm going to, but they are taking forever to send it. Gonna see if the upped calmag dosage is changing anything don't wanna go overboard. Foliar feels like the safe route.

In the meantime: I noticed temps were getting lower but last two days it hit very low, 15c (59f) during lights off. Figured info might help diagnose.
The room I draw air from were warmer though, so I guess insulation is not that great and boosted the exhaust fan up from 10% to 20% to draw in more warmth from other room. Also turned thermostat up so it draws in even hotter air.

From today 1 hour ago, right before lights on(18/6 cycle).

 

[Destroyer of chairs]

I can tell they don't like the low temps :/

 

[Destroyer of chairs]

Better lookin?
Look at the odd leaf symptom very sporadic on a few plants(possible the ones drinking most).
They get too dry at times cause of my neglect/shitty memory. Burn from ec rising when dry?

 

[Destroyer of chairs]

Do u think it will be OK to switch to 12/12, or still too shabby?

 

[A e o n]

I usually try to get all those discolorations worked out before the flip. Youre pretty much there, so you could flip. Id top, prune small lower leads and a lot of the lower scruff off (I prefer bonsai/bush.) And if you have the time : Give them a little "rest" for a couple days(raise light high up and reduce fertigation) then resume veg, once they grow again then flip. IF you dont have the time just flip after prune. It is possible something like this could be caused by a root pathogen.

 

[Destroyer of chairs]

I usually try to get all those discolorations worked out before the flip. Youre pretty much there, so you could flip. Id top, prune small lower leads and a lot of the lower scruff off (I prefer bonsai/bush.) And if you have the time : Give them a little "rest" for a couple days(raise light high up and reduce fertigation) then resume veg, once they grow again then flip. IF you dont have the time just flip after prune. It is possible something like this could be caused by a root pathogen.

I do have environmental issues now in winter(lowest point 14°c) which may make things worse. Especially when my highest temp is 28°c, difference is way to big.
They also dry out too much sometimes because routines..

Really want them to look their best before switching, and will prob give them another week to do just that and to fill out the canopy better(3 plant area needs it).

Thx for the tips. Wanna clear out the bottom part for leaves and pull all branches that won't make it to the top.
When I should do this I'm not sure. Last time I had no system except do as little as possible after flip. I have read alot on the subject but more often than not that doesn't help cause ppl have so many different ways.

 

[A e o n]

Add a little space heater? they are like $30 at hardware store with built in analog thermostat.

Ive been pruning bonsai for years now; prune excessively in veg (not defoliation, just removal of lower scruff and leads) and top all the way up to flip. Prune days 1 and 21 of flower doing same thing minus the topping. If you have extra time you can be removing lower branches all throughout those first 3 weeks of flower. Stop removing lower leads at after day 21. If defoliating most do it at day 1, 21 and 42; sometimes defoliation only at 42 is good, just don't overdo it like most. I get 2lb per plant without CO2 pruning like this in coco dtw.

 

[Destroyer of chairs]

Add a little space heater? they are like $30 at hardware store with built in analog thermostat.

Ive been pruning bonsai for years now; prune excessively in veg (not defoliation, just removal of lower scruff and leads) and top all the way up to flip. Prune days 1 and 21 of flower doing same thing minus the topping. If you have extra time you can be removing lower branches all throughout those first 3 weeks of flower. Stop removing lower leads at after day 21. If defoliating most do it at day 1, 21 and 42; sometimes defoliation only at 42 is good, just don't overdo it like most. I get 2lb per plant without CO2 pruning like this in coco dtw.

Adding a heater would solve it but I allready got a 2kw heater w/digital thermostat . Lights and all equip pull about 2k also. Got 2x 25m with cable and a bunch of splitters.
Fuse went out a couple times so far, but only when someone pushed the circuit connecting more devices.
Adding another heater would def be too much.
Winter is too damn cold atm just gonna hang on max couple months.

Thx for the in depth description of your ways, appreciate it. Also a fan of topping sporadically wherever it's needed to keep a even canopy and fill out sideways.
With those numbers what is Ur veg time?

Just to be clear, scruff and leads is suckers and..?

 

[A e o n]

Could add some water buckets, to soak up heat and radiate it at night. Not sure how much this would do though; old greenhouse grower trick... like putting a bunch of large stonesaround plants outdoors (which does raise temp a couple degrees at night) all from thermal energy release stored during the daytime.

Usually around 3-4 months veg from date of cut taken. Could prolly do 2 months if pushed it. Pretty much all vegetation on the lower half of the plant, which will push the growth outward after topping. Then once the canopy is full, smaller leads/shoots/tops that, like in a forest, would only compete and make the other nugs, or trees, smaller should be removed.

 

[Destroyer of chairs]

Could add some water buckets, to soak up heat and radiate it at night. Not sure how much this would do though; old greenhouse grower trick... like putting a bunch of large stonesaround plants outdoors (which does raise temp a couple degrees at night) all from thermal energy release stored during the daytime.

Usually around 3-4 months veg from date of cut taken. Could prolly do 2 months if pushed it. Pretty much all vegetation on the lower half of the plant, which will push the growth outward after topping. Then once the canopy is full, smaller leads/shoots/tops that, like in a forest, would only compete and make the other nugs, or trees, smaller should be removed.

Wouldn't that add moisture? Or I guess it should work with lids on as well, problem solved. Interesting direction though. Could solve this by adding something to the room that will absorb alot of heat. Thx man, full of ideas!

Would love to grow just one plant each area though it would take a while me being me.