Help

[Dxg598]

Hey guys

I cant seem to pinpoint my problem.
im at start of week 5 of flowering ,symptoms started at the start of the 4th week of flower
as picture show im starting to get some yellowing and brown spots on some fan leaves on top of the plants.
im growing in soil in 5 gallons smart pots with general organics nutes.feeding schedule is in the picture and i even use the optional nutes when possible
4 x led grow lights 2200 watts total
48 x 48 grow tent with exhaust fan

i have looked all over and really cant seem to figure it out.
also do i remove those damaged leaves?

thanks for the help

[Mr.furley]

Dxg, what brand of soil? how close are your light? And the size of the foot print? Template and humidity? What is the ph? If this is all checking out this may be a toxicity.

[Dxg598]

Soil pro mix hp
Light is about 20 inch from the topmost bud
no idea on the size of the footprint
Humidity ranges from 50 to 55%
temp is around 70 degres farenheit
ph doesnt need to be checked with general organics products( i tested every watering for a month and it always had the right ph so i didnt do it again).

my first tought was light burn but no upper cupping of the leafs they are drooping instead.

[furrysparkle]

Sounds like a boron excess, do the newer leaves contort or wrinkle?

[Mr.furley]

What is your watering and feeding practice? A picture of the whole plant in nature light would be great, can't tell colors, but red.

I would check your PH of the runoff water. around week 3 of flowering cannabis is needing a different set of nutes and a lot of times if the medium isnt flushed there is a buildup of unused/excess of what the plant does not need from medium, if it does uptake it then you get a toxicity. Note: that nitrogen toxicity start closest to the lights. It is common to have problems with PH, and/or deficiency/toxicity showing by week 5.
PH will change through the grow, not what you put in but were the medium is at, so check the PH in and out just to rule it out.

If that is good, the lighting is a thought. did you add, lower or turn up the lights around the time this started?

I belive Promix is a soilless medium.

[Dxg598]

Furrysparkle yes it does indeed look like a boron excess will a flushing fix it? The leaves claw down

[alltatup]

Hi Dgx, I agree with mr.furley. I can't see the plants at all in the pink pics, but that leaf looks like your plants need a good flushing.

https://www.growweedeasy.com/flushing-sick-cannabis

If you scroll down a little, you'll see a leaf that looks like yours.

[Dxg598]

Furrysparkle it happens only to the older leaves.

mr.furley i water eveytime my soil is dry up to the first knuckle or i lift the pot is its light i water. Usually theres an interval of 3 to 4 days between watering.
i will test my soil ph next watering.
i have never flushed unless it was harvest time.
so just water it for a week or 2 with phed water?
for the lights i have removed a low budget 1000 watt and added a quality 900 watt a week ago but i added some pulleys also so that took my light down about 5 inch but symptoms were already showing before i put the new light and before i put the pulleys.pro mix is soil with perlite.
also do i remove the damaged leaves?

[Dxg598]

6.5 the majority of time
And i just feed

[Mr.furley]

Have you been feeding nutes from the veg stage?

[Dxg598]

Look at the feeding schedule in my pictures i follow that. During veg i use bio thrive grow and during flower bio thrive bloom with all the others mentioned on the schedule

[D.A.A.S.69]

How many watts are being used from the wall, ? Is that 2200watts, actual watts, ?

[Dxg598]

i dont know i have listed the light i have in my next post

[Mr.furley]

phlizon 900 actual draw 220 Watts.

meizhi reflector series 600 actual draw 277 Watts covers a 3 by 3 tent at 18"

yae tek 300 watt actual draw 145 Watts x 2

150 watt vander life actual draw 50 Watts

787 watt actual combined draw

Took a minute to look each one up for specs.
You got a lot of light for that space, I'd rise them up, maybe even take a couple out. I'm not the best Source For LED but some that use them should be alone, Still need to check that Ph
Nice looking plants.

[Dxg598]

Thanks yes il check the ph tommorow il water with plain phed water to flush them a bit and i will get those light up a bit.

[Dxg598]

Here is the models of my lights
phlizon 900 watt with bloom switch
meizhi reflector series 600 watt with bloom switch
2 x yae tek 300 watt full spectrum (red orange light apparently boosts flowering)
and a small 150 watt vander life for spots that has less light.

i forgot to mention my tent is 48 x 48 x 80

[Dxg598]

Picture of the setup and pictures of the plants on daylight

[D.A.A.S.69]

Dxg598, nice plant, I don't see anything wrong but maybe your upper leaves, got very close to being bleached, they look lighter than your lower leaves, but they will be fine.
You might want to raise them up some or take out some like Mr.furley said.
GoodLuck

[Dxg598]

D.A.A.S Will that cause to have brown spots here and there?
i have upped my light 6 inches and i will water with phed water and see if that helps

[D.A.A.S.69]

Brown spots sounds like you need cal-mag, have you been using any ? Are you using tapwater?
Next time try to get pictures of the brown spots.

[Dxg598]

I use cal mag on every feed im using filtered water and picture is in my first post i will put another one clearer

[Dxg598]

Can it be a nute lockout?

[D.A.A.S.69]

Are you checking your run-off?
Lights to low can cause all sorts of problems, spots included.
Next picture can you take it in natural light ? Can't see good with your Led on.

[Chefbjy]

With cannabis plants that have light burn, your leaves can sometimes become yellow or red/purple, possibly with brown spotting, often with burnt tips/edges and margins that stay green. Other problems, like nutrient problems, can trigger or make the symptoms of light burn a lot worse. Leaves may also appear generally burnt in places when there’s too much light, especially when combined with heat or nutrient problems.