Is this Heat stress? or somethin else

Hey ...my girls where looking fine last week , and now im seein, yellow tips, and its on most of em, worse on others, like it spread around the upper leaves leaving just the middles the normal green. also 1 strain has most leaves curling upwards, now. def looks like a problem. I lifted lamps up another 1ft. They where about 12in from the canopy be4. 600hps. Other problems i was thinking , was my tap water. very high ph where im at like 7-8. Ive been tryin to lower it, but the vial testers suck..

so wuts my problem doc??

the vial testers do suck man. i just set myself back a few weeks from using them... had my pH too low. I went out and got a meter. They're about 70-80 bucks. At least you can rule the pH out of you get one and make proper adjustments.

It does look a bit like heat stress. You exhausting the hot air from your room?

ya pulln 180cfm's out on a timer that kicks on a setting ...i have it on like 80 so itll kick on an bring it back down, on and off throuout the day.

as far as the ph ya man i know .. i need to get that ... just not sure wut the deal is right now ..was tryn to figure it out w. out buying a hanna ph tester..

i hadnt really started feeding the plants nutes till maybe 2 weeks ago, since they where new clones on the 18th of march that i put in soil. but either way the tops look the worst this week bottom foliage still green and healthy, thats why i was leaning on it beein heat related with that hps to close, and maybe a mix of ph related problems

Rudeboy007 said:

the vial testers do suck man. i just set myself back a few weeks from using them... had my pH too low. I went out and got a meter. They're about 70-80 bucks. At least you can rule the pH out of you get one and make proper adjustments.

It does look a bit like heat stress. You exhausting the hot air from your room?

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any1 have any advice from solid knowledge......?

I have checked the faQ page and googled all the problems im having...but still not sure if it is a heat or ph or nute prob. would love some advice

Hey man, just getting back to this. I looked at the pics again and I would have to say that it looks like a combo of heat and over fertilization. The upward curling leaves is what tipped me off to over fert and the yellowing is usually from heat stress. What is the temp at the top of the plants?.

It's hard to tell with the pic, but looks like Heat and PH. Maybe a better pic, without the HPS on of the whole plant.

Unity

hottest my hydrometer has registered is 89 degress. i had ther thermo on fan set to kick on at 80. it def get hot in there at canopy level with the 600 and the 400 runnin together, but i was in veg 24/7 light, until yesterday and i turned it back to 12 12 . so that should help w. heat im thinking. lights are now only on from 12 am to 12 pm.

as far as ph im tryn to get it in check...i didnt feel like i over fert cause ive been real casual about feeting. advanced nutes, 1 teaspoon per gallon of grow / micro, and bloom.. thats wut ive been fedding so far

i thought i actually had a lack of nutes, but the ph being over 8 in the tap water, even thou ive been tryn to lower it, i felt might have locked out say Mag, or N im not sure

unity said:

It's hard to tell with the pic, but looks like Heat and PH. Maybe a better pic, without the HPS on of the whole plant.

Unity

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heres some more pics

tilemaster said:

heres some more pics

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Mg deficiency caused by a lockout would be my guess. I think you are fine on the nitrogen for now, they still look overall dark in color.
89 degrees is way to hot without additional co2, and even then 85 should be max since THC degrades above 85
A good ph tester is a must when shit starts going wrong, sorry mate.
The fan you are talking about, is that a circulation or an extraction fan? I hope extraction!
Before you change anything relating to feeding, I highly recommend getting the ph right, otherwise you will have no clue if it is being caused by a mg lag in the nutes or if it is caused by a lockout!

Let's see what others think!

BTW, 'out-gassing' starts like this as well, but progresses rather rapidly to a nitrogen def. followed by stunting.

Unity

Ya Unity, thanks for gettn back 2 me. good call id love a group concensus.

ya 180 cfm extractor fan. pretty much runs 24/7 set to kick on at 80 ....but w/ 1k of light its been peaking that and then runs till its 3 degress shy of 80 and then turns off, and so on.

I use a rubbermaid trash can for res of tap water. it was high like 7.- 8.0. but i figured my nutes as i mixed them in 1 gallon containers would bring down the ph. but then they get straight water everyother feeding so ph must matter. anyways i used some hydro ph down, and got my res down to like 6.-6.5. i flushed 2 nights ago, then gave them 1/2 strenght nutes again. they are just begining 12 12
as of the 15th.

Ive been on the same nutes from start. advanced grow, micro, bloom. also the ratio ive been using is straight off the bottle for veg 1 teaspoon of grow, 1 teaspoon of micro, and a half teaspoon of bloom. As far as canopy heat, ive got my lights plenty high at least 18inches away from tops of shoots. Get at me Doctors
so i can get right

unity said:

Mg deficiency caused by a lockout would be my guess. I think you are fine on the nitrogen for now, they still look overall dark in color.
89 degrees is way to hot without additional co2, and even then 85 should be max since THC degrades above 85
A good ph tester is a must when shit starts going wrong, sorry mate.
The fan you are talking about, is that a circulation or an extraction fan? I hope extraction!
Before you change anything relating to feeding, I highly recommend getting the ph right, otherwise you will have no clue if it is being caused by a mg lag in the nutes or if it is caused by a lockout!

Let's see what others think!

Unity

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any body wanna try 2 diagnose

Damn so heres the deal, as far as ph, id been feeding them tap water , that was stored to let chemical evap, in a rubbermaid trash can. I got the hanna meter yesterday, fooled around with it a little, but this morning tested everything. Tap water is 8.5-8.9 straight out the faucet. my girls having been getting that everyother feeding. and then nutes and tap everyother. not sure how much the nutes brings down the ph everyother feeding but im sure not 2.0. so ill figure that out, but thats probably most of my concern, since the heat is no longer being i stoped running the lights 24 7, and switched to 12 12

tilemaster said:

any body wanna try 2 diagnose

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