Not Quite Sure What To Do?

Capn-Crunch

Capn-Crunch

Well-Known Member
New growth is showing interveinal chlorosis that looks like a Magnesium issue and also seeing
some purple petioles that could be a phosphorus issue?
I know the tent is crowded, can't put outside for a couple more weeks.
VPD is out of range, temp is 75F and RH is at 75%
Plants are 6 weeks old
Jacks 321 @ 800ppm and 6.2 to 6.5 PH every 3 to 4 days grown in 1 gal fabric pots watered to slight runoff

Any ideas or discussion on what to do?
 

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ANC

ANC

Well-Known Member
ow does it look calcium wise? any small brown necrotic spots?
You can water in some epsom salts too if it is just magnesium...
purple blotches and light coloured areas between veins scream magnesium,

maybe find some calmag plus if you can, as it has boron too and is good until about week 4 in flower, after that back to epsoms..
 
3rd Monkey

3rd Monkey

Well-Known Member
I agree with ANC, but simply adding more isn't going to help in my opinion. You're humidity is too high, restricting nutritional uptake. Fix your humidity, they'll become turgid again and start taking up nutes.

If you go blasting it with nutrition, you'll go into lockout until you get that humidity fixed.
 
ANC

ANC

Well-Known Member
Shit, yeha I didn't see that RH, mine might peak there if I have to close the door during lights on for an hour here and there.
But the dehumidifier quickly brings it down once the door opens and keeps it OK overnight.
They don't sell a nice medium sized one over here.
 
3rd Monkey

3rd Monkey

Well-Known Member
ANC said:
Shit, yeha I didn't see that RH, mine might peak there if I have to close the door during lights on for an hour here and there.
But the dehumidifier quickly brings it down once the door opens and keeps it OK overnight.
They don't sell a nice medium sized one over here.
Click to expand...
If only they could make one that doesn't spit heat lol.
 
ANC

ANC

Well-Known Member
Regardless I would still foliar the epsoms, the plant needs the magnesium to make chlorophyll, and the roots seem to be all kinds of messed up right now.

MY AC can pull about 20% RH out and still cool a room, but is pricey to run... basically doubles running costs. while it is pumping.

My 26liter dehumidifier is less than 400W, it together with the lights keep the room at about 26C (79F) downside, my RH seldom goes below 60%, unless I were to leaf strip like mad.
 
Capn-Crunch

Capn-Crunch

Well-Known Member
ANC said:
classic mag def... try foliar feed epsom salts.
And do something about what you are feeding it.
Click to expand...
3rd Monkey said:
I agree with ANC, but simply adding more isn't going to help in my opinion. You're humidity is too high, restricting nutritional uptake. Fix your humidity, they'll become turgid again and start taking up nutes.

If you go blasting it with nutrition, you'll go into lockout until you get that humidity fixed.
Click to expand...
Thanks for the opinions guys, I appreciate it.
I'll do a light spray of Epsom.
The humidity here has been around 86% for the last week and I don't have a dehumidifier, nor anywhere in the tent to put one.
Maybe running more air through the tent will help, or leaving it open?
 
ANC

ANC

Well-Known Member
yeah if you can move everything out of the tent, it will probably gain you 10 or more percent
 
Capn-Crunch

Capn-Crunch

Well-Known Member
If I can keep the plants healthy for a couple more weeks then I can put them outside in the greenhouse.
Won't be warm enough till then
 
coreywebster

coreywebster

Well-Known Member
Capn-Crunch said:
yes
Click to expand...
Reason I ask is because light burn can look similar to mag def.
Plus mag def should show far more lower down the plant and by the time it spreads up to higher growth the lower growth should be depleted of magnesium more than it looks due to it been relocated to new growth.

As far as reducing rh, you can do a defoliation, with less leaves comes less transpiration
The more air you circulate the more the plants (remaining leaves) will transpire.
That might help balance things out so your plants are uptaking more nutrients.
 
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Capn-Crunch

Capn-Crunch

Well-Known Member
coreywebster said:
Reason I ask is because light burn can look similar to mag def.
Plus mag def should show far more lower down the plant and by the time it spreads up to higher growth the lower growth should be depleted of magnesium more than it looks due to it been relocated to new growth.

As far as reducing rh, you can do a defoliation, with less leaves comes less transpiration
The more air you circulate the more the plants will transpire.
That might help balance things out so your plants are uptaking more nutrients.
Click to expand...
I don't think it's light burn? The closest the light has been was 24" above.
I was hoping to wait for outside to do a defoliation, but like you say I may need to do one soon.
I've defoliated these 2 times already.
I'll pull some leaves when I sex these plants in a day or 2.
 
coreywebster

coreywebster

Well-Known Member
Capn-Crunch said:
I don't think it's light burn? The closest the light has been was 24" above.
I was hoping to wait for outside to do a defoliation, but like you say I may need to do one soon.
I've defoliated these 2 times already.
I'll pull some leaves when I sex these plants in a day or 2.
Click to expand...
Fair enough.
If you can get your vpd better it may all sort itself out.
Can you raise the temps 4-5 degrees?
 
Capn-Crunch

Capn-Crunch

Well-Known Member
coreywebster said:
Fair enough.
If you can get your vpd better it may all sort itself out.
Can you raise the temps 4-5 degrees?
Click to expand...
I have some HID lights I'm not using. One of those would probably get me to 85 to 89F probably?
The lowest I can get RH at the moment is about 68%
 
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