does this look like a calcium deficiency?

hey all currently on my second grow

got 4 mimosa and 4 grape candy breath

all in soil

18 days from rooted clone

growing under 4 x 260 wat quantum board s

the first pic is 18 days ago

the next set of pics is today

mimosa







grape candy breath








in the whole 18 days I've only give them 1 half strength feed

the mimosa are doing just fine yet the grape candy breath are really struggling

my environment is pretty stable and as it should be

so yeah just after a few opinions on what you all think this might be

cheers

Just to clarify your running 4x 260w QB kits which is 1040w + over that small space?
What distance from the plants? How big is the space your lighting?

coreywebster said:

Just to clarify your running 4x 260w QB kits which is 1040w + over that small space?
What distance from the plants? How big is the space your lighting?

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yup that's it mate... growing in a 1.2 x 2.4 tent.. they are dimmable tho and there currently sitting at 30000 lux which is on the low end for veg

Samb213 said:

yup that's it mate... growing in a 1.2 x 2.4 tent.. they are dimmable tho and there currently sitting at 30000 lux which is on the low end for veg

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Ah fair enough, I didn't realise first glance at your pics that there were more plants than the first pic, thought you'd gone maximum overdrive on that little area.

Yeah it looks like a bit of cal def in some places, but I still think its more light shock looking at the pale yellowing on whole plants.
Is your temp up and your VPD on point?

coreywebster said:

Ah fair enough, I didn't realise first glance at your pics that there were more plants than the first pic, thought you'd gone maximum overdrive on that little area.

Yeah it looks like a bit of cal def in some places, but I still think its more light shock looking at the pale yellowing on whole plants.
Is your temp up and your VPD on point?

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oh yeah mate I know what you mean.. they are almost to powerful for this tent tbh.. today I upped the lights a bit to see if that sorts the taco leaf.. but yeah I'm at a loss.. the plants in the left of my room are doing just fine yet on the right there all looking pretty rough.. same light nutes and everything.. my temps are sitting at 26 during the day and about 21 at night.. rh might be a tad low at 50 percent rh but I really don't know... that's my previous grow below

Its hard for me to be certain, normally I would expect to see red leaf vein if it were just too much light.
Don't want to lead you down the wrong path when it could just be calcium, which there are signs of.
All I know is in veg I have to be dimmed to 50% range and keep by temps over 80f for things to look awesome.
Sorry I cant help nail it down better , I have a tendency to see light intensity issues when its not always the case.

I think you need to up the mag/epsom salt. and then I think it may be a tad lite on the nitrogen as a second thing to consider.

Samb213 said:

hey all currently on my second grow

got 4 mimosa and 4 grape candy breath

all in soil

18 days from rooted clone

growing under 4 x 260 wat quantum board s

the first pic is 18 days ago View attachment 4402983

the next set of pics is today

mimosa

View attachment 4402986

View attachment 4402988

View attachment 4402989

grape candy breath

View attachment 4402990View attachment 4402991

View attachment 4402992

View attachment 4402994


in the whole 18 days I've only give them 1 half strength feed

the mimosa are doing just fine yet the grape candy breath are really struggling

my environment is pretty stable and as it should be

so yeah just after a few opinions on what you all think this might be

cheers

Click to expand...

My thoughts at 1st glance are exactly what Bernie420 suggested.

The necrotic areas that look similar to magnesium look more like light burn to me with dead tissue between the veins.
There is some leaf curl in the 2nd to last pic also suggesting light stress.

Still feeling nitrogen and magnesium are needed or maybe a balanced fertilizer as a top dressing and a light dose of Epsom salt dissolved in the water.

It looks like you are using two different soils. What are they?