ph fluctuation or calcium def.

[chronicle24]

hi , i have 40 plants under 1000mh and 1000hps.im having 2 problem 1 is deformation of the leaf and the other is discoloration of leafs.im about to go into flowering.i grow pro-mix using a solution with 6.o to 6.3 of ph.the temp. of the grow is 75f light are on and 68 when they are out.i mist them just water because humidity level is 27%.they are 2 weeks into veg.
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thanx

[cigarettes42]

fill out the troubleshooters form. but one thing did you check the run-off cause you could almost answer one of your questions. also your kinda feeding them with a low ph. i had a bad experience once when i watered with those ph and it made my soil very acidic which made it very dificult to bring back up. but ya fill out that lil form. oh hey dont keep misting it with just water right now. your leaves kinda look leached out. check that ph run off or things will get really bad!

[Divestoned]

You do have a small ph problem run your ph at 6.8 ish.

I dont think that is whats causing the color change.We may need more info to diagnose that.

[Rusty Trichome]

Looks like low ph, which is resulting in lockout. Would raise it a tad, and see if the color starts coming back.

In my garden, I follow a simple rule...Indica's that have large enough leaves that will trap moisture between them...never get sprayed with anything unless it's to correct a defeciency or kill bugs.
Moisture is easily trapped between the leaves, and problems of mold and restricted aspiration can result. I grow in the desert, where humidity is around 9% during the summer, and the more mature ladies really appreciate the dry heat. Early in veg...a light mist now and again to help with moisture loss. Late veg...make 'em work themselves for their moisture. (from the soil)

When spraying, do you raise the lights at all? Moisture spots on leaves act like little magnifying glasses, and can easily burn leaf tissue.

Why the concern for calcium? Are you using tapwater?

[chronicle24]

i did run-off test. i put in 4l of water with a 6.8 ph and the run of was at 5.2ph. why the ph that low if the lowest ph was at 6.

[bigtopsfinn]

"Second, the soil itself changes over time, as particles break down, buffering ability is used up, and nutrients are leached out by the activity of roots or flushing action. Old soil in a pot will get to a point where pH changes (usually drops, since most commerical media are peat-based and peat haas a natural pH around 5.0-5.5). As larger pieces of soil material break down, the interstitial spaces between them also get smaller, and the soil holds water very differently. Drainage starts to slow, and the roots again end up sitting wet and stagnant."-StinkyAttic

[Rusty Trichome]

What kind of ph test are you giving? A color-coded test srtip or kit...? Runoff ph will show different, because the tint of the water skews results.

The peat-based soil is always low. That's why the soil companies add lime or somehinfg similar to buffer the mix back to neutral. But as time goes on, the buffer starts to degrade, and lose it's buffering capabilities.
Is this runoff reading from fresh soil, or has it been used a time or two? You might want to look into getting some garden lime, some fresh soil, or changing the brand altogether. A runoff of anything under 6.3 in soil is unacceptable.

[chronicle24]

i used a ph pen . i always used new soil for evry grow.

i dont know if i said it before but thanx for all the help.evryone