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This is windburn right?

XanHalen
XanHalenstarted grow question 21d ago
This is windburn right? left 2 fans on for 48hr, when I usually alternate between them each day.. Anything i can do to help recovery? should i have fans on a timer to give some fan downtime?
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Week 4
Leaves. Wilting
Leaves. Other
Setup. Ventilation
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Ultraviolet
Ultravioletanswered grow question 20d ago
No it's not windburn, windburn is when the plant changes the shape of the leaf making it more aerodynamic. This is indistinguishable. What you seen is not windburn, water cycle is not functioning efficiently for one reason or another. Overheating leaf, heavily laden with water, wrinkling leaves. Excess air will increase the rate of transpiration, if it's already running high from environmentals then it could be closing the stomata so much so preventing release of water at the rate it needs to grow. While transpiration, the process of water movement through a plant and its evaporation from aerial parts, doesn't directly rely on root respiration, it is indirectly influenced by it. Root respiration provides the energy for active transport of water and nutrients into the roots, which then become the source of water for transpiration. Soon as oxygen becomes low root respiration will cease. When root respiration is crippled, transpiration slows down significantly or even stops. Root respiration provides the energy needed for water and nutrient uptake by the roots. If this process is impaired, the plant cannot effectively draw water from the soil, leading to a decrease in the amount of water available for transpiration. Consequently, the plant will reduce or cease transpiration to conserve the limited water it can absorb. Plants roots don't fill those pots yet, if roots can't reach then the moisture in those fabrics are 100% at the mercy of evaporation. Transpiration is a daytime process where the roots pull water where they find it. You must encourage a little evaporation at some point in the cycle otherwise gravity will pull water to bottom of pot where it will stagnate, compress soil and cause nuisance. Unless you are cycling a low to high pressure change within the tent by utilizing a negative pressure you won't be injecting any fresh oxygen in or out of those fabrics. From my experience fabric pots are not as airy as we are led to believe, I've grown side by side with air pots, the difference in water retention was quite drastic(oxygen penetration). Have your fans blasting on those pots, until the roots fill them they are at mercy of evaporation. Only want gentle slight breeze on the actual leafs. The soil-plant-atmosphere continuum (SPAC) describes the continuous pathway through which water moves from the soil, through the plant, and into the atmosphere.
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ATLien415
ATLien415answered grow question 20d ago
SPAC is the way, the only scientific answer. besides that, ultraviolet slayed this answer this would not be occurring in hydro, for example, just because of medium differences...explained by understanding the SPAC. Folks like 0101 want to parrot what they heard on a podcast about temp and RH. Temp and RH are really a poor man's attempt at understanding the complex interactions between things like microclimates, dew point, dry bulb, bound/unbound water, and more. Just to show you how incomplete/lacking the understanding of someone harping on temp and RH here, you'll see the same people talking about VPD like it is the end-all be-all, not a continuous spectrum with infinite acceptable points on it. To illustrate this....the units for VPD is magnitudes less units than the units for the same deltas in your medium. Why aren't these folks discussing the delta in mediums when it is magnitudes more impactful than VPD? My guess is because it requires a wholesome understanding of SPAC theory
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m0use
m0useanswered grow question 20d ago
Its best to have fans on a timmer, in natures plants are not under wind 24/7 but it does come and go and some days are more windy but again, not always. I use a timer on my fans. One of them has a wide oscillation and the other has a smaller one, they are two different speeds. The wide one is on a strong speed and the narrow one is on a lower speed. it helps create air currents in the tent and just moves it around, They also do not point directly at the plants. It good to have a fan below the canopy if you have a bigger tent to help move it all around. but this is not always possible if space is limited. if you just applied some LST this might be some of the cause to the leaves. If not ease up on the fans and see what happens. If it goes away might have been the fans, or could have just been a fluke.
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Growtendo64
Growtendo64answered grow question 20d ago
Yeah, that definitely looks like windburn the clawing and rough edges are a giveaway. Leaving two fans on nonstop for 48 hours likely stressed the leaves, especially if the airflow was strong and constant in one spot. I’d recommend setting your fans to oscillate and running them on a timer or speed controller to avoid overexposure. For recovery, just reduce stress: stable temps, light airflow, and no heavy defoliation for now. She’ll bounce back.
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Kushycat
Kushycatanswered grow question 21d ago
Leaves that curl up could also be a sign of overfertilization. The soil looks very dry, how much water do the little ones get?
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Ratle
Ratleanswered grow question 21d ago
looks environmental but only you know if the basics needed for stress free growth are up to par. I'll have my fans pointed at plants from above at a good distance and oscelatting but on number 2 setting so leaves are just flickering
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00110001001001111O
00110001001001111Oanswered grow question 21d ago
assumes you ruled out temp/rh as cause too.
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00110001001001111O
00110001001001111Oanswered grow question 21d ago
don't aim fans directly at it.. create a vortex in the tent... the wind movement will jostle the plants and keep temps/rh evened out... mission accomplished. people overdo the circulation fans. if the plant 'jostles' then air is moving around, which is the key. You don't have to blast leaves with a fan directly pointing at them.
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