Leaves curling up at edges

[brainfood33]

Interesting, thanks again folks.

A little update on the situation and a possible twist in the tale.

I've been measuring the PH only by using a cheap aquariam tester kit which is absolutely fine for readings between 6.0 and 7.6.
Now since its hydro I've been aiming for about 5.5.
My tapwater has a PH of around 8.0 so I needed to lower it significantly by adding the PH down.
The tester kit comes with a card with colour matches for each PH level with a pale yellow being 6.0. Since I was aiming for 5.5 I thought that I should be looking for a darker yellow but not quite orange colour based on full PH kits I looked at on the internet.

This is where I believe I have messed up!
I am an idiot!
Since reading this I've been investigating the situation further and suddenly realised that the PH indicator might not even change colour below pale yellow so I tested the babies water with a very acidic solution and there was no difference!!
Pale yellow is as yellow as it gets so what I thought was a PH of 5.5 could actually be as low as 4.5.
I need a real PH tester but I can't do that right now unfortunately.

So, could it be too acidic that its making the leaves curl up just cause its acid or could I be locking out some nutes because the PH is too low?
Would it cause leaf curl?

Stinky, I'm still not convinced its heat because some smaller plants have it too (they are 4 inches further away than that big one) and the air temp/circulation/ventilation/humidity are all fine.

Anyway, it was time for a water change so they have a fresh reservoir with full strength veging nutes with a PH of just less than pale yellow which should be roughly where I need it to be this time. At least it won't be pure acid anyway!

On the way I have fed my babies, I don't think it is a problem.
I grew lots of plants years ago with a 3 part and as soon as they went into full veg under the HID they were whacked upto half strength then full strength a few days later and I never had any problems!
This time I've gone easy on them by putting in the 1/4 strength step and spreading it out a bit longer.

Cheers again and I'll let you know how they get on but I feel that a stupid mistake like this must surely be the reason for the abnormality.

[PharmaCan]

If you want to grow pot indoors, you need to know the pH of your water. PERIOD!!!

:beatdeadhorse:

If you have to, go buy some litmus paper. If you have to, skip eating for a couple days and go buy some litmus paper.

PC :smokin:

[brainfood33]

I know and I thought I knew what it was but I clearly had it wrong.

What is litmus paper and where can I get it?
I'll visit the growshop tomorrow and get something, maybe even a £40 meter

[snakeskin]

brainfood33 , try putting a fan(directly) blowing on affected plants. Seems transpiration is not happening fast enough for plants to keep up. Blow ye wind mate? full force,

Doesn't look like a Ph prob more like a transportation of moisture not being released into air? Just a educated guess?

[PharmaCan]

Doesn't look like a Ph prob more like a transportation of moisture not being released into air? Just a educated guess?

Snakeskin - A pH problem does not necessarily present itself as a "pH problem". Improper pH can cause a multitude of problems; and a multitude of problems can cause improper pH. What is vital for people to understand is that, regardless of your problem, pH is an integral part of the equation and you ain't fixin nuthin until you get your pH straight.

PC :smokin:

[brainfood33]

Hi again guys,

@ Snakeskin, thanks for the advice but I always have good circulation/ventilation which is displayed in the unbelievably thick stalks!

@ Everyone else, thanks again and the problem seems to be subsiding and I'm almost 100% certain it was the PH.

It turns out my lack of practice caused this and I had the PH monitoring all wrong as I didn't even take into consideration what the nutes would do to my naturally 8.0ish tapwater.
It turns out that they bring my tapwater down all the way to just under 6.0 which is exactly where I need it, so all that PH down I added was making my solution very acidic, I dread to think exactly how bad it was in numbers.
But the plants ae generally thriving and a little leaf curl didn't seem to effect their general wellbeing.

Today they went into Flower and as its Jack Herer I am expecting upto a 12 week wait before I'm smoking something good again.
I wonder how many females I'm going to get! :smokin:

[Indico]

Hey, that sounds great :smokin: