Been going on for 3 weeks! Please help, +REP

sqhschief

sqhschief

Active Member
This cupping has been going on for about three weeks, and I need some real help guys/girls.

Specs:
400W Metal Halide
6x White Widow
4 weeks old
Room temps 78F
Humidity unknown.
Fert schedule is irrelevant since this began before nutes.









Alright so please help me figure this one out! Thanks!
 

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DubB83

DubB83

Well-Known Member
My guess is either humidity or watering problems. What is your water schedule like? I have seen root bound plants do that. When were they repotted last?

By the way, those are some good looking plants.

~GG420
 
GrizzlyAdams

GrizzlyAdams

Well-Known Member
Given I see ZERO burning on any leaves its very low chance to be nute or heat problems. Unless your light is burning the leaves, MJ will just grow slower in high temps, it starts getting messed up around 100F.

I had this problem in my first grow, you are overwatering. The reason the plants in front are curling and the ones in back are not is because heat is staying trapped in the back of your grow space and drying out the dirt more. Your plants can dry out pretty extremely before they are seriously damaged. Wet/dry cycles work very well for MJ given thats how their natural environment is. Saturating your root ball then letting it completely dry is a great way to veg your plants. When the soil gets dry, the roots go looking for water. This expands your root system and oxygenates the soil, additionally when it is finally watered the root system has expanded enough you can gain inches overnight from the explosion of power from the expanded roots.

Buy yourself a soil moisture meter, they're under 10. Experiment with a wet/dry cycle and see how your plants respond the best. Soaked roots are the business of hydro growers, soil can dry out!!

Best of luck
 
sqhschief

sqhschief

Active Member
Thanks fellas for the help and approval! +rep

So the temps at the canopy is not high, it is 80F which is not very high, I have a cool tube installed also.

It is not root bound as they were transplanted last week.

It should not be over watering, since I water every 4 days with 2.5 liters per 5 gallon container. I don't even have runoff.

NOTE: I forgot to mention my soil is MG organic 60% coco fiber 10% perlite 30%.

Thanks!:peace:
 
DubB83

DubB83

Well-Known Member
What do you water with? Tap water or purified water? Do you allow it to sit to dissipate bad gasses trapped in the water like chlorine? What did the roots look like when you re-potted? Did you "tease" the roots to encourage new development? Every once in a while it may be a good idea to punch the sides of the buckets to encourage loosening of the soil before watering. I recommend watering by dousing the plants medium entirely until you have good run off and then stop. If there are nutes in the MG organic soil are you adding any organic additives like Hygrozime? Sorry for the ball of questions!

I'm partial against MG soils so I kinda suspect the 60% in the mix... But at the same time it does not look like a nutrient problem, your leaves are a good full color.

~gg420
 
sqhschief

sqhschief

Active Member
DubB83 said:
What do you water with? Tap water or purified water? Do you allow it to sit to dissipate bad gasses trapped in the water like chlorine? What did the roots look like when you re-potted? Did you "tease" the roots to encourage new development? Every once in a while it may be a good idea to punch the sides of the buckets to encourage loosening of the soil before watering. I recommend watering by dousing the plants medium entirely until you have good run off and then stop. If there are nutes in the MG organic soil are you adding any organic additives like Hygrozime? Sorry for the ball of questions!

I'm partial against MG soils so I kinda suspect the 60% in the mix... But at the same time it does not look like a nutrient problem, your leaves are a good full color.

~gg420
Click to expand...
Believe me, I did my research before using MG organic, and it is not the type with nutes in it or any slow release crap.

I water with tap that has sit 24-36 hours.

No I did not do anything to the roots when I re-potted, however this was an issue before re-potting.

For the past two weeks I have used MG tomato 18-18-21 ferts sparingly, however this began before the use of ferts. I have also been using superthrive for the same amount of time.

Like you said, I don't really think it's a nute problem. I am curious though, does this look like a humidity problem? I'm not sure, but I really need a humidity meter. They are growing fine, but this leaf curling problem has got me stumped.

Thanks a lot for the help DubB83!:peace:
 
DubB83

DubB83

Well-Known Member
Whoa! SuperThrive... be careful with that stuff. Too many synthetic auxins in it to do a bunch of good. I personally avoid the stuff right now because I am growing organic. Usually that is to be used as a fix all tonic but it can really confuse a healthy plant.

Personally it sounds like it was root bound in the old container and since you did not disturb the root ball the plant is having odd drinking schedules. At this stage of the plants life with a 60% mix of MG organic soil it really shouldn't require much nutes at all if any.

After that I would go suspect humidity, go to Wal-Mart they have great temp/humidity combo meters for around $8. Springfield is the brand name.

~GG420
 
DubB83

DubB83

Well-Known Member
Is this the soil?
http://www.scotts.com/smg/catalog/productTemplate.jsp?tabs=general&proId=prod70318&itemId=cat80014&id=cat50006

If it is I would go super easy on the tomato juice and invest in Hygrozyme and ThriveAlive B1 over SuperTHRIVE. Just my .02 because Hygrozime is designed for organic soil and nutes and ThriveAlive B1 green is just a safer fix all tonic without the synthetic auxins that can damage a plant.

bongsmilie
~GG420

EDIT: Just a heads up SuperTHRIVE has been known to burn new nodes clean off, exercise caution when using it.
 
sqhschief

sqhschief

Active Member
Wow dubb83, thanks for all that info! I will stop the superthrive for now.

$8 humidity meter at walsatan? Crap I've been looking for a cheap one for a while, but didn't even think about walmart, thanks!
 
aknight3

aknight3

Moderator
it is definitley heat stress at the top i wouldnt worry about it, maybe blow a fan on them, they look very very nice though they will yield some nice buds good luck friend :peace:
 
sqhschief

sqhschief

Active Member
aknight3 said:
it is definitley heat stress at the top i wouldnt worry about it, maybe blow a fan on them
Click to expand...
I know for a fact it isn't heat stress. I had a fan on them, took it off and no difference, not better or worse. Like I said this is a 400w mh in a cooltube with temps of 78F at a height of 10 inches above canopy, so not heat stress.
 
Azgrow

Azgrow

Well-Known Member
10 inches aint much room an it looks like the plant/s directly under the light are being affected....eathier rotate the plants or raise the light up a couple inches.....it's heat stress taco's....az
 
sqhschief

sqhschief

Active Member
Azgrow said:
10 inches aint much room an it looks like the plant/s directly under the light are being affected....eathier rotate the plants or raise the light up a couple inches.....it's heat stress taco's....az
Click to expand...
Well, it's actually the worst on the one farthest from the bulb, however I will raise the light a few inches just to see. I am beginning to think I may be under watering!
 
captain420

captain420

Member
Yup...underwatering gets my vote!!! You must see run off every time you water...maybe not every time you feed, but every time you water without nutes for sure. Gets all past nute buildup out and keeps all the roots nice and moist

They will snap right back after a good watering...good lookin plants BTW...are they sexed yet??
 
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