Taco leaves curling down

J

Josetodoloco

Member
Hi guys,

I am having a weird problem with the leaves, and I will need some help.

The water temperature is around 20°c, lights around 16 inches, CO2 between 800 and 1200 ppm (I have the furnace close), air temperature 22°c, TDS around 800-900ppm,
PH 6.0-6.2. I notice the RH was 25% and the reserve of water was a bit low, the fan is not too strong and is not too close to the plants and no signs of root rot (they are white and no weird smell)

I know that with high CO2 the plants drink more. This is happening only to the tallest plants, the others are fine, that makes me think it could be dehydrated because they are closer to the lights, the RH was too low and CO2 is a bit high.

I increased the RH to 45%, lifted the lights a few inches, lower the TDS to 600 ppm and increased the reserve of water.

Anyone experienced this issue?

Thank you in advance.
 

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Last edited:
S

sf_frankie

Well-Known Member
Drooping leaves are usually root rot, over watering or under watering. Since you are in hydro and you said the roots look fine then its probably under watering. The fact that its only the large plants pretty much confirms that. Those big girls are thirsty!
 
J

Josetodoloco

Member
On top of the canopy I saw 24°c. I saw a small improvement in 1 of them, the other still the same. The leaves are dropped but also have the taco shape. Do you know how long does it take to recover?
 
bernie344

bernie344

Well-Known Member
Josetodoloco said:
Hi guys,

I am having a weird problem with the leaves, and I will need some help.

The water temperature is around 20°c, lights around 16 inches, CO2 between 800 and 1200 ppm (I have the furnace close), air temperature 22°c, TDS around 800-900ppm,
PH 6.0-6.2. I notice the RH was 25% and the reserve of water was a bit low, the fan is not too strong and is not too close to the plants and no signs of root rot (they are white and no weird smell)

I know that with high CO2 the plants drink more. This is happening only to the tallest plants, the others are fine, that makes me think it could be dehydrated because they are closer to the lights, the RH was too low and CO2 is a bit high.

I increased the RH to 45%, lifted the lights a few inches, lower the TDS to 600 ppm and increased the reserve of water.

Anyone experienced this issue?

Thank you in advance.
Click to expand...
Try to get temp upto 27c and rh 60
 
S

sf_frankie

Well-Known Member
bernie344 said:
Try to get temp upto 27c and rh 60
Click to expand...
An RH of 60% is wayyyy to high for flowering don’t listen to this guy OP.

With your air temp @ 22C you’ll want your RH at 40% for proper VPD. 22C is a little on the cold side but as long as you get your humidity right it should be fine. If you want to take advantage of the elevated CO2 levels from your furnace you’d want to run warmer room temps if possible. How much control do you have of your room temp and humidity levels?
 
bernie344

bernie344

Well-Known Member
sf_frankie said:
An RH of 60% is wayyyy to high for flowering don’t listen to this guy OP.

With your air temp @ 22C you’ll want your RH at 40% for proper VPD. 22C is a little on the cold side but as long as you get your humidity right it should be fine. If you want to take advantage of the elevated CO2 levels from your furnace you’d want to run warmer room temps if possible. How much control do you have of your room temp and humidity levels?
Click to expand...
60% @ 27C keep it in context
 
J

Josetodoloco

Member
sf_frankie said:
An RH of 60% is wayyyy to high for flowering don’t listen to this guy OP.

With your air temp @ 22C you’ll want your RH at 40% for proper VPD. 22C is a little on the cold side but as long as you get your humidity right it should be fine. If you want to take advantage of the elevated CO2 levels from your furnace you’d want to run warmer room temps if possible. How much control do you have of your room temp and humidity levels?
Click to expand...
I can go up to 25°c, and I have a humidifier that works fine. I am lowering the temperature to see if they recover a bit, I can increase it later. Do you also think they are dehydrated due to the low humidity?
 
bernie344

bernie344

Well-Known Member
Josetodoloco said:
I can go up to 25°c, and I have a humidifier that works fine. I am lowering the temperature to see if they recover a bit, I can increase it later. Do you also think they are dehydrated due to the low humidity?
Click to expand...
Check on youtube Dr Bruce Bugby to confirm the facts.
 
S

sf_frankie

Well-Known Member
bernie344 said:
60% @ 27C keep it in context
Click to expand...
Yeah but he’s flowering. 60% is perfect VPD during veg at your temp. You should bump your VPD up to 1.3 or so during flower. In the end it really doesn’t make a huge difference.

His RH is wayyy too low though.

This is this is a screenshot of the chart I use. You can change between flower and veg.
 

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Rurumo

Rurumo

Well-Known Member
Did you lower the lights prior to this happening? I see you raised them, just wondering if that was because you recently lowered them? This kind of thing can be caused by light saturation after lowering strong lights too quickly. Just a thought, everyone else pretty much covered the other possibilities.
 
J

Josetodoloco

Member
Rurumo said:
Did you lower the lights prior to this happening? I see you raised them, just wondering if that was because you recently lowered them? This kind of thing can be caused by light saturation after lowering strong lights too quickly. Just a thought, everyone else pretty much covered the other possibilities.
Click to expand...
I added an extra light, you are right it could also added extra stress.
 
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