Upwards leaf curl on Power Plant during flower.

[VerdantGreen]

What STRAIN are you growing? PowerPlant
What was the establishing technique? (Were the seed or clone?)Clone
What is the age of your plants? 5 weeks flower after 4 weeks veg
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? flower
What Technique are you using? organic soil
What substrate/medium are you using?(Hydroton, RockWool etc.) organic soil mix with dolomite lime
What is the Nutrient temperature? ?
What Nutrient's are you using? organic soil amendments, guano, rock dusts

Are you sure your calibration is correct on your equiptment? yes
When was your last watering? yesterday
When was your last feeding change? not fed in flower apart from 2 recent applications of molasses at 1tsp/gallon (after i saw the problem)
What size bulb are you using? 250 hps
What is the distance to the canopy? 6-7 inches
What is your RH Factor? normal 40 %
What is the canopy temperature? 70-80
What is the Day/Night Temp? (Include flucutaion range) 60-80
What is the current Air Flow? (cfm etc.) plenty
Is the fan blowing directly at plants? no
Is your water HARD or SOFT? hard - i correct to pH 6-7 before watering
Has plant been recently pruned, cloned off of or pinched no
Have any pest chemicals been used? If so, What and When? no
Are plant's infected with pest's no

so i noticed the leaf curl a week ago and it has got slightly worse since (although plants look reasonably happy) i reduced watering as i thought it may be soil too wet and added a little molasses for magnesium but it hasnt solved the problem. (powerplant apparently gets cal/mag def easily)

can anyone help? - it shouldnt be salt buildup in organics either

leaf

thanks

V.

 

[James Morrison]

heat bud...as of now they look great though good work

 

[VerdantGreen]

thanks james, but the temps have been lower than usual recently as the summer has turned into autumn, and this plant is a bit further away from the light than the others none of which show the same symptoms...

 

[Mr.Hades]

The plants look great buddy...

The upward curl does look like heat stress, but can also happen if the plant is too close to the light, even if temps arent too high...

I was also wondering what your ventilation is like in there?

Maybe you should try to give them some plain water next watering... And make sure not to water too soon.

 

[vince514]

great suggestions guys it does appear to be heat stress but it could also be a genetic trait..imho

 

[Buffoonman]

When a leaf curls up its trying to retain moisture maybee the humidity is a bit dry. That leaf looks well healthy though. Nice grow.

 

[VerdantGreen]

thanks for the suggestions guys, could it be heat stress from the range of temperature? 60-80F? - as i mentioned temps have gone down recently rather than up. it's been raining here for the last week so humidity would be reasonably high.
this is the only plant in the cab that has these symptoms (1 of 4)

my environment is pretty stable as i have a temperature controlled in line fan in there.
and they have had nothing but plain water except for a couple of weak 'feedings' of molasses.

any further thoughts??

personally the only time i've seen a similar problem (leaf margins pointing up) i cured it by reducing the watering. i thought that when leaf margins turn up it is because the plant is trying to transpire as much as possible - perhaps this is different??


many thanks

V.

heres a nugshot taken on the same day as the above pics

 

[Buffoonman]

Leaf curls down to transpire up to retain moisture. If only one plant is doing it then as mentioned above it will probably be genetic, have you seen photos of deep chunk on a lot of them the leaves curl up.

 

[ibjamming]

Keep doing what you're doing...

 

[VerdantGreen]

Leaf curls down to transpire up to retain moisture. If only one plant is doing it then as mentioned above it will probably be genetic, have you seen photos of deep chunk on a lot of them the leaves curl up.

tbh the only 'genetic' leaf curling i have seen is more as a result of a heavy coating of resin glands.

having tried to keep the plant on the dry side for the last week i gave it a good water today to see if that makes a difference. besides i have a few seeds that i made in a couple of buds (crossed with Black Forrest sativa and another bud with geurilla gold) so i dont want shortage of water to compromise those

ibjamming - thanks!

 

[StealthDragon]

at first glance I would guess heat stress as well, but you've debunked that. My second guess would be genetics I have 2 different strains in the exact same conditions,same soil, light,age etc..
gdp upward curl

superskunk downward curl

Only other thing I can think of is soil temps perhaps? Would that have that effect? Just a guess. Hope this helps.

 

[hazy]

I sure thought I posted about these power plants. Some where someone's going what are you talking power plants, i have something else!!

What you have is a manganese toxicity, That causes cupping of leaves. Toxicities are caused by low pH in the medium. which are caused by salt buildup?
Flush and give them light nutes and maybe a little cal-mag (does molasses have magnesium?)at the end of the flush, so they don't show deficiencies. ...Well, I guess you don't use nutes because your stuff is in the soil? You can flush organics. You can flush any salts that the microbes have already made available to the plant.
Your plants look great. Nice looking buds.
hmmm...
You know VG, I wouldn't flush them, I'd just keep hitting them with plain water with a bit of runoff. miniflushes as it were. They look good, and your half way or more along. I'd hate to see a stem snap trying to fuck with it.

 

[VerdantGreen]

stealthDragon - thanks - soil temps could be it as they would have dropped recently. i swapped things around a little air-wise today (my winter setup) so it'll be interesting to see if it helps.

Hazy - you also posted on my thread - that may be what you remember mate
i have been doing pretty much as you said for the last few days - watering more with a little runoff and adding molasses (blackstrap has magnesium) they look a bit better. i think these will finish in the next two weeks. thanks

 

[Mr. Greengenes]

Yum, they look vewwy tasty!!