severe confusion..please help!!!

[Kromazone]

hey guys..ok my main problem is leaf curl (upwards) its not on all my plants but several plants have leaf curl going on..also i no i have a def. in several others..on the one pic im fining that this gurl has sum issues..

heres my set up:
Strains: Fast bud #2 / speed devil #2 / pandora / vertigo
Medium: OF soil in 2.5 gal pots
Nutes: ( big bloom/ tiger bloom )
R/O water
1400 watt hps total (1000w air cooled reflector and 400 w ghetto bat wing reflector)
Temps: typically around 72-80 (day) nighttime temps are between 60-65
RH was 20-25 % buti recently got a humidifier and boosted RH upto 40 %

I'm attempting a perpetual harvest w/ 36 ladies currently in room @ diff stages..

I didnt start feeding my gurlies till i started seeing sum preflowers going on (approx. 3 wks from germ.) used sched. for soil. it said 2 tsp of tiger bloom per Gal. of water and 3 tsp of big bloom per gal.

I'm using a 1/2 gal pitcher for nutes.i mix 1 tsp of big bloom and 1/2 tsp of tiger per 1/2 gal of r/o water.. I ph after i add nutes.always ph to 6.3-6.4

the leaf curl is driving me crazy more than anything. Thought my lights were too close soo i raised them up to about 2 ft above tallest plants. it worked out in the past but this time it doesnt seem to be the issue..maybe overwatering? I was going w/ 1 qt of water per plant but since my tallest gurls are @ 25 in. so i increased amount of water to 2 qt (only tall ones)
the one pic of leaf curl is from tall plant.I water several days ago but leaf curl is still apparent.only some of the fan leaves are curled..

fast bud and speed devil seem to affected the worst..I have a beautiful fast bud plant doing great budding wonderfully BUT i also have several other fast bud plants that are 1/2 the size and burnt tips etc....same soil same amount of water nutes..confused??? I think i have a cal/mg def. w/ several plants ..

ooh..soil ph is sitting around 7.0
i ph my water to 6.3
havent done any runoff ph yet..i will today

Would low humidity play a role in leaf curl?
Any advice is very appreciated!!!

BTW: has anyone seen a plant grow like this before..? (referring to pic where theres no main stem/ vertical growth..only branching out on the sides..weird..

 

[Red eyed c]

Your soil ph is a bit to high at 7,you wanna be aiming for 6.2-6.5 range.nutrient uptake will be affected if your soil stays at 7 mate

 

[SeNiOr-FuN-gHi]

could it be a deficiency in micro nutrients? you are using r/o water so its a possiblity.. with the nutes youre using does it have any micro nutes?

 

[namvet]

Is the entire rootball wet on the ones with leave curl,it almost looks like there dry. May also be over feeding,somtimes less is more.As far as those with no center stem, did you pinch the central leader off at one time.If you didn't that one strange girl or girls.I think this one going to take some of the input from the more experienced guys on here like muddy , nelson , stitch.This one looks like a job for supperman!!!

 

[Muddy]

Looks like you're got two things going on here. One is your pH being too high. The second is overfeeding. If I remember correctly nutes are 2 tsp. per gallon for a normal feed. That much, in conjunction with the high nutrients in the OF soil is too much. I doubt you'll need more than 1/2 strength. I would recommend that you flush those plants with 3 times the pot size of pHed water. That will flush out the excess nutrients but you'll still need to get your soil pH lowered. Shoot for around 6.3.

 

[Kromazone]

thx guys ..@ muddy..would you recommend dolmite lime to lower ph? do you think high ph/ overfeeding has everything to do w/curling upwards leaves? I'll be flushing the affected gurlies today.. :O)
Also are there any other nutes that are good to use other than big bloom and tiger bloom? I dont believe either one of those have micronutrients in them.

 

[Kromazone]

my bad..!!! tiger bloom has micronutes..

 

[Joe Dirt]

.@ muddy..would you recommend dolmite lime to lower ph? do you think high ph/ overfeeding has everything to do w/curling upwards leaves?

Just FYI, lime raises pH.

Muddy has told you what you need to do to get back on track. I wouldn't waste much time getting to it. The problem will only get worse until you do.

To be honest, a soil pH of 7.0 doesn't sound right to me. I would be curious as to how you got that reading. I have never had an issue with OF having pH problems... plus, when you factor in the heavy fert regimen you've been using (which will usually lower the pH, if anything), a high pH reading doesn't make sense unless you have amended the soil in some way you haven't mentioned. If I'm correct, your issue may have been cause primarily by nute burn (and maybe a low pH).

Are you amending the pH on your fert mix before you feed? This is very important. If you don't do it, you'll be back with a similar problem.

Regardless, you'll need to flush. OF has lots of nutes and microbes without adding the ferts. So, be careful (as stated by others) and start your ferts at 1/4 strength and build up gradually unless you see an issue. If an issue arises, take a step back... but, when you go slowly, the problem is usually not as severe.

 

[Kromazone]

@ joe dirt..i used a soil test kit to get ph reading..i ph'ed r/o water to 6.2 filled upto line tossed tablet in and capful of dirt .mixed it then let it sit for a minute or so..then matched color to chart.it fell in the 7.0 range according to the kit.
I flushed 2 of the affected plants earlier and tested runoff ph it was @ 5.2
So i believe your right when stating that i have a low ph. (i ph'ed water to 6.2 that i flushed with)
I always ph after i add nutes to water before i feed.
i understand about overfeeding and ill take everyones advice and back off nute dose.

Should i use lime to raise the ph then?
thx for all the helpful advice guys!!

 

[Joe Dirt]

then matched color to chart

We have to be careful using color charts to get readings from liquid we have added color to (ferts, molasses, soil, etc.)

Should i use lime to raise the ph then?

I have only had this issue once and I used baking soda. It goes a long way. I sprinkled about a teaspoon on the soil and watered it in. It worked for me in that instance.