Light stress? Razor blade edges, dry thin, slowly losing color

[Jaydot]

I sprayed a1.3EC epson salt foliar 2 days ago,
so doesn't look like it's magnesium shortage that's causing the razor blades.
Overall new growth has a healthy green I think.
But the razor blades are getting pretty "sharp"

A little recap,
23c, 55% RH, barely 10dli, no strong wind, air is getting sucked out of the tent
chances are very slim that this is a sign of heat/light/wind stress
Last runoff was 1.3EC and only watering every 3 days to let roots grow

Pictures are when lights just turned on

 

[Jaydot]

Still growing but issues seem to remain
I have seen some new growth with yellowing veins, and some leaves below the canopy are dark green and showing nitrogen toxicity,
Which would block out magnesium and maybe explain the chlorosis,
but why now, the EC has not been changed?
The roots are now growing properly so maybe that has something to do with it.

I also added a picture of 1 month ago to see the difference

 

[CannabisMingus]

why now, the EC has not been changed

Because nutrient requirements for a plant vary with time esp. with fast annuals like autos. Thats the problem with nutrient deficiencies - sometimes you are addressing an issue that no longer exists although you are seeing symptoms. IMHO, YMMV, etc.

 

[Jaydot]

The canopy was overwhelming all the nodes so I trained her down a bit,
pictures before and after within 24h
Feeding 1.1EC, runoff 1.2
Currently 12 dli

 

[Jaydot]

She just does not get better...
Don't know what to do anymore
She grows but not looking healthy overall

 

[Del boy]

The canopy was overwhelming all the nodes so I trained her down a bit,
pictures before and after within 24h
Feeding 1.1EC, runoff 1.2
Currently 12 dli

Hello to me it looks like you are over feeding i never go that high my EC 0.7 in veg as in coco you feed every time you water and your run off PH should be the same as your input or dam close if not you are not getting enough run off which will acount for your defficiences

 

[Jaydot]

Hello to me it looks like you are over feeding i never go that high my EC 0.7 in veg as in coco you feed every time you water and your run off PH should be the same as your input or dam close if not you are not getting enough run off which will acount for your defficiences

I can always try feeding less but I measure my runoff and there is never any buildup,
I feed between 1 and 1.2 EC and runoff is is always below 1.3 EC.
But I don't mind trying since I don't know what else to try lol

 

[Del boy]

I can always try feeding less but I measure my runoff and there is never any buildup,
I feed between 1 and 1.2 EC and runoff is is always below 1.3 EC.
But I don't mind trying since I don't know what else to try lol

Hello i used to get a lot of razor edge leaves and deficiencies when i first started growing could not work it out tried everything then droped the ec and upped the run off till ph was the same as the input no more problems you dont need high Ec to grow big plants these girls were fed a EC 0.5 to 0.7 this was them just before chop with a low ec you dont get as much salt build up in your coco which in turn helps to keep things stable less is more sometimes

 

[CannabisMingus]

Can you increase your DLI?

 

[kfigerm]

reading through your thread backwards i already had an idea, but didn't dare to put it public, because it looks so wrong on the pictures, but all put together gives ME an idea...Just an idea of mine...think and ask others what they think.
especially:
masterblend (2-2-1.2) + silica
is this your nutes NPK? only nutes - no ads? Theres a lack of K that is crucial for healthy growing at this stage and if you push the energy you put in, that should be there. Perhaps it was always that and not the light.

I think you will soon know. Try to keep feed, as long you dont see necrosis.They don't look bad mate. If she starts to stretch properly you may be well on track though. If you have the lower leaves watch them and watch the top new growth as well.
If it starts a necrosis on green leaves fast, you may have had a starting K def thats fast progressing.

Perhaps try to start off with a (nute line with) higher K in one spare pot to check the thesis under your lights.

got it wrong, forget it