Yellowing - Form Completed & Pics

[ledtime]

I don't know what to do. Soil runoff is at 7.5 even after flushing with 3 gallons of 6.8.

E-indoor or outdoor - INDOOR
E-soil, soilless, coco, aero, or hydroponic - SOIL
E-specific medium - FOX FARM OCEAN FOREST - STRAIGHT FROM BAG
CSL-Soil type/brand - FOX FARM OCEAN FOREST - STRAIGHT FROM BAG
SCL-Anything you have added to the soil - PH'D TAP WATER
SCLR-Soil or slab runoff pH - 7.5
E-Water source - TAP
E-Source water pH - ADJUSTED TO 6.8
E-Age of plant - 21 DAYS FROM PLANTING SEED
E-Type of fertilizer - FOX FARM TRIO - HAVE NOT USED YET.
E-Rate of application (if hydro, this is your PPM number, preferably after each component is added) - NONE YET
E-Lighting source and distance from plant - 400W HPS COOLTUBE AT 12"
E-Air temperature (both day and night if you are running a dark period) - 82 DEG. - 24HR LIGHT ON
E-Air % Relative humidity - 45%
E-Lighting schedule - 24/0
E-Type of ventilation your room has - 200CFM IN-LINE NO SCRUBBER

ledtime Reviewed by ledtime on 01-25-2010. Yellowing - Form Completed & Pics I don't know what to do. Soil runoff is at 7.5 even after flushing with 3 gallons of 6.8. E-indoor or outdoor - INDOOR E-soil, soilless, coco, aero, or hydroponic - SOIL E-specific medium - FOX FARM OCEAN FOREST - STRAIGHT FROM BAG CSL-Soil type/brand - FOX FARM OCEAN FOREST - STRAIGHT FROM BAG SCL-Anything you have added to the soil - PH'D TAP WATER SCLR-Soil or slab runoff pH - 7.5 E-Water source - TAP E-Source water pH - ADJUSTED TO 6.8 Rating: 5

[ledtime]

Here's a nice note, I just took some fresh FFOF soil and put it in a clean cup with holes in the bottom. I took 6.6PH RO water and ran it through the soil. The water that came out was at 7.5PH. Same problem I'm having now.

Did I get a bad batch of soil here? At $25/bag you would think it would be buffered in the right range.

[Weezard]

Here's a nice note, I just took some fresh FFOF soil and put it in a clean cup with holes in the bottom. I took 6.6PH RO water and ran it through the soil. The water that came out was at 7.5PH. Same problem I'm having now.

Did I get a bad batch of soil here? At $25/bag you would think it would be buffered in the right range.

Howzit Ledtime?

PH 7.5 in soil shouldn't hurt your plants brah.

And they look jus' fine. cept your light is too close.

They have stopped growing and are starting to bleach.
No worry, happens to the best of us.
[attachment=o236313]

Those leaves are toast and will stay that way, but the new growth should be fine if you raise the light a little.


$25 for a sack of FF!?
Geez! Hope ya got a big, wet, sloppy, kiss with it.

Aloha,
Weezard

[ledtime]

I just raised the light up some. Didn't know that the plants would have a problem if there wasn't any heat on them from the light.

Hopefully that was the problem. Question is how high should the light be? I just put it up to 18".

[Weezard]

I just raised the light up some. Didn't know that the plants would have a problem if there wasn't any heat on them from the light.

As I understand it, they stop growing when exposed tight energy in excess of 91K Lux.
Course, then the lower branches keep growing and push the tops into the light.
'round 100K Lux, they bleach.

Hopefully that was the problem. Question is how high should the light be? I just put it up to 18".

Should be plenty.
But, mo' betta, ask a metal halide guy.
Been a long time, 10 years, since I grew HPS.

All I can tell ya from recent, personal experience, is my 150W. LED light starts bleaching at about 4".
Thats what cooked my lemonskunk in da photo.
Strain, temperature, and wavelength would be the variables here.

Dem girls prolly ok now.

Aloha,
Weeze

[ledtime]

I was measuring it out at 60-61k lux at 12"

[Weezard]

I was measuring it out at 60-61k lux at 12"

I'm guessing that's more accurate with, say, sunlight, than it is with HPS narrow band yellows.
It is rather meaningless with LEDs.

I would get lost tryin ta figure hominy microeinsteins are dancin' on da head o dat pin.
But, should your head be short on spin.
We could wait for Knna to return again.

Luckily, we do have a cheap n easy biometer.
A jolly, green Icarus whose leaves, at first, just ghastly, turn a whiter shade of pale.

Sorry, the Hash turned out well:stoned:.

Weeze

[Rusty Trichome]

Doesn't look like heat stress, but they do look bleached.
1) When did this condition start, and are you using anything different than on previous successful runs?
2) Is this the same strain you've grown before, or is it a new strain to you?)
3) Is the tapwater from the city, or a well on your property?
4) What's it's out-of-the-tap ph?
5) What are you using to adjust water ph? (you're not adding limestone to the soil or water are you?)
6) What are you using to check runoff ph? Are you attempting to chase an invalid ph number with color-coded strips or kits?
7) Are you spraying with ammendments or 'growth' teas or bug sprays?
8) Doing anything to them that might affect roots? Stuff like consistent overwatering causing root stress/root rot, sitting on a cold cement floor or next to a heater, overdosing with hydrogen peroxide...)
9) I've never been a big fan of a 24/0 light schedule. Have you always used this schedule?

Most (peat-based) soils without ph buffers take a ph dive and go more acidic. Overbuffering will keep it near 7.0 no matter what you do. So doubtful it's the FF soil, but anything is possible. Is it fresh?
When do you plan on starting the FF Grow Big and Big Bloom? I know 21 days is a tad early for 21 day old seedlings, but did you 'accidentally' fertilize them too early? Ocean Forest is chock-full of nutrients already, but could be time to start half-doses per FF Feeding Schedule if you've overwatered/flushed too often. The link is in my signature. (if you try...only try on one till results appear)

[ledtime]

Looks like Weez was spot on with the light bleaching. I moved the light up some more and now all the growth is coming in green.

The soil PH is high however. I did a slurry test using 6.6PH RO water and after thirty mins it registered at 7.5PH. I used two different PH meters to test this.

Fox Farm is baffled, but they are shipping me out a few bags on their dime.

Now, I did flush them pretty heavily. So, when they dry out I'm going to water them next with half dose nutes in the 6.5-6.6 range since the soil is still high.

You guys think that is alright? Now I know to test the soil PH, even when I pay an arm and a leg for what is supposed to be "The Good Stuff". Rookie mistakes. I'm sure we've all made them.

[the image reaper]

going by your first photos, I would say 'magnesium deficiency', and, you might re-calibrate your pH tester, Reverse-Osmosis water should pH just like distilled water (7.0) ... unless, your filters need changing ... :smokin: