Help OG Kush has problems

[amneziaHaze]

MgSo4 Magnesium Sulfate aka Epson salt

 

[DillyTrying2Learn]

What is epson?

Epsom salt

 

[Gr33ndoc]

Ah ok, thx

 

[LoveGrowingIt]

You say always have enough CalMag in the nutrient solution, but what happens if there is too much CalMag? Then there must be a lockout, right?

There's a wide range, so overdose is rare. Ca and Mg need to be in a proper ratio, however, because they are antagonistic to each other. That means too much of one can reduce the availability of the other. I've never had a problem with that, though.

 

[JadedMarxist]

Do you have a fan blowing directly on them plants? It looks like dry air and wind burn froma fan directed at the plant!

 

[Gr33ndoc]

Do you have a fan blowing directly on them plants? It looks like dry air and wind burn froma fan directed at the plant!

No, the recirculated air is passive, against the walls.

 

[FloridaMike]

Here are pictures from today. It doesn't get any better than this.
I'm going to spray BAC Plant Vitality Plus tonight before lights out, it's a fine stuff. If it is a fungus, it should be slowly contained.
Overall it looks healthy, which I find strange. Excess would also be noticeable on the top tips, but they look healthy.

Could it be that the disease is already in the seed? Cultivated 2 x and 2 x this problem.

my plant had a very similar problem. thing is; it only affected the ends of the middle finger on both sides of plant @ about the 3rd set of leaves. unfortunately i did not think to take pics at the time. i left them on for about a week to see if it was mobile. nope, only the 2 leaves and it did not spread. never did figure it out.

 

[Gr33ndoc]

Hey everyone!
I would like to thank you very much for your help!
The problem with the dried leaves has been solved :-) Thank you!
It was due to the VPD/humidity. Now I have a humidifier that regulates the humidity in the room to 55%-60%, at a temperature of 22-23°C.
This is a VPD value of 1.12 - 1.26, i.e. at the upper end of the late vegi phase.
Now the tips of the leaves are turning slightly yellow, I think the EC value is a bit high at 0.8 (Aeroponic).

Thanks again ;-)

 

[Gr33ndoc]

Now I have 2 more questions, it would be nice if you could help me.

1. which is more important, the room VPD or the leaf VPD

2. my 2nd OG Kush, 5th week of flowering, shows brown spots in the middle of the leaf, on the leaves in the upper half of the plant.
I think it is calcium deficiency?
There is another plant in the room, Runtz Muffin from Barneys, it does not show these symptoms.
The VPD is also a little too high here in the room, could this also be the cause?
Thanks again, great community here!

 

[FloridaMike]

check this resource out. it has an interactive interface

and can come in very handy - hope you can find some

value in it, as i have -peace-

https://www.growweedeasy.com/cannabis-symptoms-pictures

 

[FloridaMike]

@cpurola

have i offended thee?

oops my bad, i read back through and saw that you

put the sad face on my vivosun ordeal. all apologies -peace-

 

[Bdubs]

Leaf temp VPD is better to go by if you are trying to optimize VPD further as LVPD is what the plant sees directly.
But, your leaf temps should be pretty close to ambient temps. If not, then there is a problem.

Leaf temps are used a lot to verify whether the plant is processing the light properly. Low leaf temps indicates a too low of light level, not enough light energy to warm the leaf. And when leaf temps go up it is an indication that the light received is too much to process and is turned to heat energy and warms the leaf.

Although, leaf temps are not really something to obsess over imo, it can definitely help pinpoint or verify light stress conditions and verify environment considering the light received.

Epsom salts can be good. But I tend to steer clear of things that have a negative effect. Epsom used too much can cause a lot of problems. Consider it the cheapest way to care for your plants. Only if you can’t get ahold of something better.
Like someone said, you need cal and mag in proportionate amounts or you lockout. Epsom salt adds magnesium and not calcium. You play with fire. Use CalMag in the bottle forget about this nasty plant killer for novice growers. If you don’t add calcium with that epsom, you are going to throw off the balance. So to make it easy, calmag liquid every mix and never think about it :).

 

[amneziaHaze]

Leaf temp VPD is better to go by if you are trying to optimize VPD further as LVPD is what the plant sees directly.
But, your leaf temps should be pretty close to ambient temps. If not, then there is a problem.

Leaf temps are used a lot to verify whether the plant is processing the light properly. Low leaf temps indicates a too low of light level, not enough light energy to warm the leaf. And when leaf temps go up it is an indication that the light received is too much to process and is turned to heat energy and warms the leaf.

Although, leaf temps are not really something to obsess over imo, it can definitely help pinpoint or verify light stress conditions and verify environment considering the light received.

Epsom salts can be good. But I tend to steer clear of things that have a negative effect. Epsom used too much can cause a lot of problems. Consider it the cheapest way to care for your plants. Only if you can’t get ahold of something better.
Like someone said, you need cal and mag in proportionate amounts or you lockout. Epsom salt adds magnesium and not calcium. You play with fire. Use CalMag in the bottle forget about this nasty plant killer for novice growers. If you don’t add calcium with that epsom, you are going to throw off the balance. So to make it easy, calmag liquid every mix and never think about it :).

Or you can buy CaNo3 5kg for 10$ and have calcium and nitrogen.then just allways mix epson salt first then calcium.other way you get rocks that plant cant eat.
Epson is cheap but not bad the sulfate from it will give soo much taste to the plant

Compared that to a bottle of calmag that 80% water for the same price.

 

[Gr33ndoc]

Hey guys, happy new year!
Could you guys help me out again?
I think it's a calcium deficiency, what do you say?

My key data:
LPA 40L
PH 6.3
EC 1.2, increased to 1.4 (GHE Tripart SW)
Calcium approx. 147mg/L
VPD 1.5-1.6 automated
PPFD between 850 and 1100
Strain OG Kush Barneys Farm
Flowering week 6

I am at a bit of a loss and would be very grateful for help