Light and oscillating fans advice.

[MintyDreadlocks]

Probably a little of both because my fan is at the opposing end of my room compared to my humidifier.

I only tend to see the issue about 5 or 6 weeks into flower where plants are big enough and leaves are plentiful that they hang right by the fan and my humidifier is off most of flowering time.

I found god and im a believer now.

 

[Star Dog]

Usually symptoms of wind burn beginning are leaf edge roll up almost like a taco. It’s where the humidity around the leaf surface differs greatly to the leaf itself and causes the roll up to preserve water retention at the leaf surface.

again this could be combated using VPD charts etc but is easily dealt with by relocating the offending fan if you can.

What is vpd? I'm inclined to think along the lines of Jpd but it's always better to know?
I relocated my fan and its all sweet now.
Thanks :thumbs:

Going back to windburn this is my understanding of how it comes about, we're flowering so the humidity has to be kept low, the air coming and getting heated dramatically drops in rh%, i can't remember the figures but if you take air at 15c 80% rh and heat it to 25c for the same moisture content the %rh drops to 45% rh.
The rh is relative to how much water air can hold so cool air generally has a high %rh because it can't hold much moisture.
So in short we have dry air being exchanged for dry air unless it's coming in heated from outside.
As always I'll happily stand corrected that's just my understanding rightly or wrong?

 

[jondamon]

What is vpd? I'm inclined to think along the lines of Jpd but it's always better to know?
I relocated my fan and its all sweet now.
Thanks :thumbs:

Going back to windburn this is my understanding of how it comes about, we're flowering so the humidity has to be kept low, the air coming and getting heated dramatically drops in rh%, i can't remember the figures but if you take air at 15c 80% rh and heat it to 25c for the same moisture content the %rh drops to 45% rh.
The rh is relative to how much water air can hold so cool air generally has a high %rh because it can't hold much moisture.
So in short we have dry air being exchanged for dry air unless it's coming in heated from outside.
As always I'll happily stand corrected that's just my understanding rightly or wrong?

VPD = vapour pressure deficit

you can combat high heat or low heat by adjusting your RH for optimum growth based on VPD charts.

personally I don’t worry about VPD.

I keep vegging plants in 50-65% RH and flowering plants in 40-50% RH.

 

[Star Dog]

"Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves."

To me that's a description of rh% the amount of water air can hold is directly related to its temperature?
I've only scratched the surface I'll look into it again.

 

[jondamon]

"Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves."

To me that's a description of rh% the amount of water air can hold is directly related to its temperature?
I've only scratched the surface I'll look into it again.

Like I already said tho I don’t get hung up on it.

if you’re a commercial grower looking optimise every aspect then VPD charts etc play an important role of maximising your output.

the idea of vpd is to know exactly based on charts where you’re optimum growth happens and what temp and RH for better transpiration rates etc.

 

[Willie_wonder]

I have a tower oscillating fan pointed at my 4x4 tent door oscillating the side of my tent because even on the lowest setting it’s too strong for my plants. With the tower fan hitting the wall all plants get some good air circulation it appears; and The plants are well developed 60 day veg and 12 day flower, but the fan still wipes the leaves like crazy especially with the slow oscillations. Oh yeah it’s also on top of a cat litter container cause the plants are tall bois.

 

[Star Dog]

If you look at post #2 you'll see an upright pole, you'll also see the fan is up high thanks to advice given, it's near the top of pole fixed to a L bracket so it faces out as normal, i also bought a plug in dimmer so I could slow it down a touch.

 

[Star Dog]

I'm wondering if anyone can see this? Members have been helpful but I've been asking questions on other people's posts, anyways...
I've since taken the temps from the leaf with an infrared thermometer 22.5/23c, and I've moved the fan up to the top of the tent imo it was blowing a little hard for my liking, in the past years I've always used a small fan but I'm noticing a little wind burn this time?
Anyway moving it up and facing it so it's deflecting of the roof coupled with a plug in dimmer has them just lightly moving/fluttering.
View attachment 4667938
The fan is on that pole fixed by a L bracket and cable tie, that makes it easy to adjust.
View attachment 4667939
I've just got back after years away from it, it's surprising how quickly you forget the important details, example I had to google the h202 + nitrozyme ratio
So I've planted a pack of sensi blackberry, some of the plants look great other have a touch of tip burn, one looks under fed and 2 look excessively dark is it normal, i don't mean they look bad but they aren't as uniform as I expected, it's been a long time since I started from seed it might be the norm I really don't know?

Cheers SD

Certainly a mix of various phenos, some are big leafed stalky others seem sparse by comparison I'm far from an expert but I can see there's plants indicia dominated and some sativa dominated and a few with in-between, 16/20" tall
I feel like a right clown not getting a clone from each but the truth is I can't be bothered with it, anyone else feel like it's a task?

A week ago today I believe this was taken...

And a week before again...

All in I'm quite happy with the grow but disappointed in myself for not sorting clones and not having it netted.

A photo of my lamp/reflector with the bulb being vertical you don't get the same radiated heat temp, the bulk of the heat is radiated out horizontally around the bulb instead of vertically, in my op I was concerned about the radiated heat so I lifted it a bit, i measured the distance from the bulb to the canopy yesterday 14" to the centre its a 600w
Does anyone use a parabolic?

I think I fkd up not netting it when I flipped or shortly after.
What about netting now its 2 weeks into flower?
What about 9 clones put into one pot?
Yes it's lazy but but and the genes are there if there's a special one, it's sensi blackberry cake is anyone familiar with it?

Cheers SD

 

[RadicalRoss]

9 clones in one pot sounds like a good way to get 8 dead clones.

 

[Star Dog]

9 clones in one pot sounds like a good way to get 8 dead clones.

Would you care to enlarge on that?
Personally I can't see a problem but I'll listen to your experience?

 

[RadicalRoss]

It wouldn't be my experience, just my understanding of how plants work. Quite possible I'm wrong here, but the way it tends to work with multiple plants in a single pot is they will compete for resources, starving most of them out so there can be one champion remaining.

 

[tyke1973]

Ya definitely want a fan blowing air onto the plants ,it makes for stronger stems.Stronger stem hold bigger buds.Light wise I would ditch that for a cool hood.You really only need one seeling or clone in pot,they will fight for light.Focus on the one pref take more clones than you need and select the front runner,the one with the best root system.If your growing that many plants in that size tent then the vast amount of the bottoms will be taken off any how .And take my words for it that would include all those spare seedlings apart from one .You will find having more than ine in a pot makes them stretch also .Good luck look forward to flower time
Tyke

 

[Star Dog]

It wouldn't be my experience, just my understanding of how plants work. Quite possible I'm wrong here, but the way it tends to work with multiple plants in a single pot is they will compete for resources, starving most of them out so there can be one champion remaining.

I'm sorry to be blunt but that's absolute rubbish.

 

[RadicalRoss]

I'm sorry to be blunt but that's absolute rubbish.

I could maybe see a world where you get away with 2 or 3 cannabis plants in a pot, but 8 of them?! No way that works out well.

 

[Star Dog]

It doesn't need to work well it only has to keep them alive long enough to know if i want them, plants co existing quite happily in nature I can't see the problem, looking after 10 cuts is to time consuming amongst other reasons I can't go into.

 

[RadicalRoss]

Nature is a lot bigger than a 7 gallon pot is the problem. When plants compete for resources in nature there are more of them to go around. Also, you probably won't see 8 cannabis plants in an area the size of a pot in nature.

They may live long enough for you to determine which ones you want to keep, but then you have to separate them out into their own homes, which can be a hassle. Ultimately I think you'd be better off just using jiffy pellets and red solo cups for the clones, but I'm super curious how tossing a bunch of them into one pot will work out.

 

[Star Dog]

Nature is a lot bigger than a 7 gallon pot is the problem. When plants compete for resources in nature there are more of them to go around. Also, you probably won't see 8 cannabis plants in an area the size of a pot in nature.

They may live long enough for you to determine which ones you want to keep, but then you have to separate them out into their own homes, which can be a hassle. Ultimately I think you'd be better off just using jiffy pellets and red solo cups for the clones, but I'm super curious how tossing a bunch of them into one pot will work out.

I'll certainly post a few photos provided they don't die that is lol I'm aiming for minimal maintenance time will tell, thanks for your thoughts

 

[Star Dog]

Ya definitely want a fan blowing air onto the plants ,it makes for stronger stems.Stronger stem hold bigger buds.Light wise I would ditch that for a cool hood.You really only need one seeling or clone in pot,they will fight for light.Focus on the one pref take more clones than you need and select the front runner,the one with the best root system.If your growing that many plants in that size tent then the vast amount of the bottoms will be taken off any how .And take my words for it that would include all those spare seedlings apart from one .You will find having more than ine in a pot makes them stretch also .Good luck look forward to flower time
Tyke

So you have experience with a parabolic?
I agree with what your saying about taking clones but it can't happen I'm afraid.

 

[Star Dog]

Certainly a mix of various phenos, some are big leafed stalky others seem sparse by comparison I'm far from an expert but I can see there's plants indicia dominated and some sativa dominated and a few with in-between, 16/20" tall
I feel like a right clown not getting a clone from each but the truth is I can't be bothered with it, anyone else feel like it's a task?
View attachment 4678291View attachment 4678292
A week ago today I believe this was taken...
View attachment 4678303
And a week before again...
View attachment 4678304
All in I'm quite happy with the grow but disappointed in myself for not sorting clones and not having it netted.

A photo of my lamp/reflector with the bulb being vertical you don't get the same radiated heat temp, the bulk of the heat is radiated out horizontally around the bulb instead of vertically, in my op I was concerned about the radiated heat so I lifted it a bit, i measured the distance from the bulb to the canopy yesterday 14" to the centre its a 600w
Does anyone use a parabolic?
View attachment 4678299
I think I fkd up not netting it when I flipped or shortly after.
What about netting now its 2 weeks into flower?
What about 9 clones put into one pot?
Yes it's lazy but but and the genes are there if there's a special one, it's sensi blackberry cake is anyone familiar with it?

Cheers SD

A couple more weeks growth it's coming along nicely.

 

[Star Dog]