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Can anyone identify this leaf issue?

  • Thread starter Thread starter longjonlebon
  • Start date Start date Dec 17, 2020
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Can anyone identify this leaf issue?

longjonlebon Dec 17, 2020 38 Replies 4,406 Views
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NairnM16

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#21
Okay I looked at wrong photo lol but treat the room not the tent looks like poor condition to me looks overwatered
 
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Aqua Man

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#22
NairnM16 said:
Defoliate the leafs leds keep humidity hight canopy that packed with that high humidity my money’s on mildew trim the canopy expose the buds you’re lights not that strong use it’s full potential
Click to expand...
NairnM16 said:
Okay I looked at wrong photo lol but treat the room not the tent looks like poor condition to me looks overwatered
Click to expand...
Huh how does led make a room more humid? How is it overwatered in DWC?
 
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Aqua Man

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#23
I hate myself for posting on AN nutes but here goes.

DO NOT PH ADJUST PH PERFECT nutrients. Add based on ppm toss the ph meter to the side and do not adjust. Of it goes way out change the res. Do not add cal mag these nutes are designed for RO and contain all you need. They should always be kept above 400ppm so that the concentration is high enough to adjust ph.

For that plant size 600ppm is plenty if your transpiration rates are good... with your humidity possibly causing issues in that area.

Your root look great so no issues there.

Water tenps below 74f and ideally 72-74f for best growth.

Air temps 75-80f if you are in single buckets I suggest 75f so you can keep res temos in check.

50-60% humidity should be good. You may need to increase air exchange to reach this. Don't forget about microclimates around the leaves. Just above that hydroton is going to be a high humidity area and you need some airflow to move it away from the plants. Cleaning up the bottoms will really help.

Look into VPD for an explanation of how temp and humidity affect nutrient uptake... especially in hydro with faster growth. It doesn't need to be perfect but the close the better.

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...
www.thcfarmer.com
 
Last edited: Dec 21, 2020
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NairnM16

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#24
Aqua Man said:
Huh how does led make a room more humid? How is it overwatered in DWC?
Click to expand...
No clue but I’ve had problems with high humidity problems using leds
 
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longjonlebon

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#25
Aqua Man said:
I hate myself for posting on AN nutes but here goes.

DO NOT PH ADJUST PH PERFECT nutrients. Add based on ppm toss the ph meter to the side and do not adjust. Of it goes way out change the res. Do not add cal mag these nutes are designed for RO and contain all you need. They should always be kept above 400ppm so that the concentration is high enough to adjust ph.

For that plant size 600ppm is plenty if your transpiration rates are good... with your humidity possibly causing issues.

Your root look great so no issues there.

Water tenps below 74f and ideally 72-74f for best growth.

Air temps 75-80f if you are in single buckets I suggest 75f so you can keep res temos in check.

50-60% humidity should be good. You may need to increase air exchange to reach this. Don't forget about microvlimates around the leaves. Just above that hydroton is going to be a high humidity area and you need some airflow to move it away from the plants. Cleaning up the bottoms will really help.

Look into VPD for an explanation of how temp and humidity affect nutrient uptake... especially in hydro with faster growth. It doesn't need to be perfect but the close the better.

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...
www.thcfarmer.com
Click to expand...

Oh man, this is awesome info! Thank you so much. I've just been looking at VPD and I defo need a better solution for reducing humidity. For the moment I'll keep the flap open as this keeps it around 70%.

This is grow 3 and humidity has been an issue every time (but has manifest in a slightly different issues each time). I've got crop, and quite a big one on grow 2, so its heading in the right direction...slowly...

Love you guys!!
 
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Aqua Man

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#26
longjonlebon said:
Oh man, this is awesome info! Thank you so much. I've just been looking at VPD and I defo need a better solution for reducing humidity. For the moment I'll keep the flap open as this keeps it around 70%.

This is grow 3 and humidity has been an issue every time (but has manifest in a slightly different issues each time). I've got crop, and quite a big one on grow 2, so its heading in the right direction...slowly...

Love you guys!!
Click to expand...
Best way is a bigger exhaust fan to exchange more air. Just making sure here.. you do have an exhaust fan and passive air intake right?
 
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longjonlebon

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#27
Aqua Man said:
Best way is a bigger exhaust fan to exchange more air. Just making sure here.. you do have an exhaust fan and passive air intake right?
Click to expand...

hmmmmm...well....no...but googling them right now!
 
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Aqua Man

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#28
longjonlebon said:
hmmmmm...well....no...but googling them right now!
Click to expand...
Ok well thats your problem.... no air exchange equals high humidity, poor transpiration and lack of co2... 100% your biggest issue.
 
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longjonlebon

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#29
Aqua Man said:
Ok well thats your problem.... no air exchange equals high humidity, poor transpiration and lack of co2... 100% your biggest issue.
Click to expand...

Cool dude. So What sort of thing would you recommend?
 
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Aqua Man

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#30
longjonlebon said:
Cool dude. So What sort of thing would you recommend?
Click to expand...
What size tent?
 
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longjonlebon

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#31
Aqua Man said:
What size tent?
Click to expand...

1.2mx1.2mx1.8m
 
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longjonlebon

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#32

HighPro Inline Fan

The compact HighPro Inline Fan delivers powerful airflow for grow tents. Quiet, energy-efficient 100% copper motor. Easy install for intake/exhaust ventilation.
hyjo.co.uk
 
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longjonlebon

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#33
@Aqua Man - Thanks!!!!
 
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Aqua Man

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#34
longjonlebon said:

HighPro Inline Fan

The compact HighPro Inline Fan delivers powerful airflow for grow tents. Quiet, energy-efficient 100% copper motor. Easy install for intake/exhaust ventilation.
hyjo.co.uk
Click to expand...
Is this what you have?

I would recommend this if you can. You can set the humidity and the fan will run to keep it close to the setpoint as long as the humidity in the room the tent sits in is lower than the setpoint.

I just plucked from a UK site since I think by the link you posted thats where you are.

It what I would recommend but anything is better than nothing so up to you.

https://vividled.co.uk/shop/ols/products/ac-infinity-cloudline-t4-quiet-inline-duct-fan-system-with-temperature-and-humidity-controller-4-inch
 
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Aqua Man

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#35
longjonlebon said:
@Aqua Man - Thanks!!!!
Click to expand...
I just got lucky on a hunch lol... figured I should ask instead of assume.
 
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longjonlebon

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#36
Aqua Man said:
I just got lucky on a hunch lol... figured I should ask instead of assume.
Click to expand...

Oh, one more really dumb question. Do I need two fans, and inlet and an outlet, or does the out take care of its self?
 
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Aqua Man

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#37
longjonlebon said:
Oh, one more really dumb question. Do I need two fans, and inlet and an outlet, or does the out take care of its self?
Click to expand...
I exhaust then open the intake flaps on the bottom of the tent so as the fan pushes air out it passively draws it in through the bottom flaps
 
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longjonlebon

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#38
Aqua Man said:
I exhaust then open the intake flaps on the bottom of the tent so as the fan pushes air out it passively draws it in through the bottom flaps
Click to expand...

I have actually been wondering what those flaps were for...magic...rofl
 
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Flexnerb

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#39
longjonlebon said:
Hey, more pics here.

Nutrients - Advanced Nutrients 3 part (Grow / Micro / Bloom). Following the feeding chart for week 6. I used Great White Micorrhiae in the first few weeks for root development.

18/6 lighting with a Mars Hydro ts1000.

No real changes. I topped up the solution two days ago so thinking I might flush them for a few days?
Click to expand...

Im wondering if that center leaf in the bottom pic that's burning inwards isnt a high N zinc antagonism issue? Im also wondering if an Mg antagonism/stimulstion issye would show up first
 
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Replies 38
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Started Dec 17, 2020
Latest post Dec 21, 2020
Starter longjonlebon
Forum General Indoor Growing

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