Yellowing with spots 1wk into flower

[ripvanstinkle]

How long has this problem been going on? 2 weeks
What STRAIN are you growing? Afgooey, Grape Ape, Chunky Cheese
What was the establishing technique? (seed or clone?) Clone
What is the age of your plants? 6-9mo.
How long have they been in the soil mixture they are in now? 2wks
How Tall are the plants? about 6 in above screen, 18 below
What PHASE (seedling, vegetative or flower) are the plants in? flower
What Technique are you using? (SOG, SCROG etc) scrog
What size pots are you using? (Include how many subjects to pot) 5gal
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) pro-mix hp
What Nutrient's are you using? cns-17 bloom
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* 15ml/gal
How often are you feeding? 2/3 waterings
If flowering, when did you switch over to using Bloom nutrients? the first day of 12/12
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)n/a
What is the TDS/EC/PPM of your nutrients used?about 650
What is the pH of the "RUN-OFF"? 6.0
What method of pH test was administered? Using Strips? pH pen? ph pen
How often are you watering? 2-4 days
When was your last feeding and how often are you feeding? yesterday, about twice a week
What size bulb are you using? 1kw
What is the distance to the canopy? 24in
What is your RH Factor? (Relative Humidity) 50%
What is the canopy temperature? 75
What is the Day/Night Temp? (Include fluctuation range) 75/65
What is the current Air Flow? (cfm etc.) 440cfm dialed down
Tell us about your ventilation, intake exhaust and when its running and not running ? exhaust runs all day, lights cooled, passive filtered intake.
Is the fan blowing directly at plants? yes
Is the grow substrate constantly wet or moist? maybe
Is your water HARD or SOFT? softened, then R/O
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? RO
Are you using water from a water softener? yes
Has plant been recently pruned, cloned or pinched? yes under screen pruning
Have any pest chemicals been used? If so what and when? no
Are plant's infected with pest's? noticed holes in leaves, but not sure.

Hello all, I am struggling with feedings/ph. I just calibrated my ph pen yesterday and noticed my nute mix was about 5.4, so I added tap water to bring it up to 6.0. and fed until I had drainage.

Chunky Cheese


Afgooey


yellowing

 

[ripvanstinkle]

Some leaves I pulled yesterday. They don't seem to be improving.

A little history: These plants were intended to be mothers and kept under cfls for the past 8 months or so. They were getting out of control, so I built this cab and threw em in. I transplanted from 2 and 3 gal bags to 5 gal buckets, and started giving them hid slowly. I watered with plain water one day and noticed the run-off was over 2000ppm, so I poured RO through them until the run-off was down to about 450. This was 2 wks ago. They never really came back like I hoped they would.

Is this lockout or what?

Please help.

 

[BurmeseDragon]

Over watered severely! These take and they don't, I wouldn't think you have low sources of nutrition, but then again it may be to hot to lower your rates of watering!

Some of it is an acid problem, raise the PH when you water less to absorb less toxins!

Why would you expect the PPM's to go back up if you didn't mention feeding to me and the birdy?

 

[hazy]

It looks like a bad calcium deficiency when i see the brown spots. The pale edges say mag/zinc etc def. The growth on top seems a little yellow which says iron def.
Up the nutes a bit. maybe hit em with cal mag

 

[ripvanstinkle]

Thanks for taking the time hazy. I'll give em a stronger feeding with cal mag when they dry out a bit. I was scared to up the nutes incase they had a lockout. Last time I fed the ppm was 650 going in, and between that and 1200 coming out.

 

[ripvanstinkle]

The GA was pretty dry today so I fed with 1200ppm of cns-17 bloom, 10ml/g lk, and 5ml/g calmag. total ppm 1400 ph 6.0. runoff ppm 1250 ph 6.2.

The (2)Afgooeys are the palest of the 4. They also retain water the longest, which is opposite of last run. I don't think I've let them dry out good since i transplanted them. Gonna give them a few more days to dry out, hopefully they won't yellow too much in the mean time.

 

[statusquo]

I don't know too much about PPM but IIRC i feel like 1200 is high. Also if you are feeding 2/3 waterings and also getting calmag in there I highly doubt its a deficiency...If anything it would be like you said...lockout. Maybe try watering with 0 ppm water and seeing what the runoff is. Good luck!

 

[ripvanstinkle]

The Afgooey makes up the back half of the garden. Chunky Cheese front left quarter, GA front right quarter.



It'll be 2 or 3 days till I can water the Afs. CC will need it tomorrow. I will give it just ph 6.0 water with liquid karma.

How much yellowing and dying should I expect under the canopy?



All comments and suggestions are much appreciated! to all of you who make growing look so easy!

 

[hazy]

Is the new growth looking greener? Seems to be in the pic.

You know, these things are kinda tough to figure sometimes. I mean you were running 650 ppms and ended up with really high runoff. Your pH was even at 5.4 not terribly low. Plus the pH down deep in the medium is unknown, it's not the same as the runoff. Maybe you could suck some out with a long syringe. But that may change after a day as the medium buffers. For example, my garden soil outside is about 8.0 pH. Pretty high. If I add something, nutes maybe to acidify the soil, it will buffer back to 8.0 and I have to try to bring it down again. My soil has a lot of calcium carbonate. caliche.
If you nutes concentrate in the medium as your pots dry, the salt ions could reform into calcium carbonate etc.and could raise the pH too high and you get lockout and deficiencies. Usually high ppms in the medium would make me think low pH. This causes the plant to take too many nutes and you usually see twisted leaves. I don't see the twisted leaves in your pics that's why I figured a deficiency caused by high pH.
On the other hand your iron? def.(the upper yellowing leaves), could be caused by low pH causing something else to be taken up so much that it locks iron etc out.
Until we are able to take a tissue sample to a university lab and have it checked, we are just guessing a little.

 

[ripvanstinkle]

Thanks Hazey. New growth appears greener in the front two



but the back two appear the same or a little worse.



The underside looks real bad lots of dead and dying leaves.


I watered the one on the front left today with liquid karma and molasses. ph 6.0, 220ppm. Took two gallons to get run-off and the ph of that was 6.1 and ppm 720.

When I water the rear two, that I suspect I've been over-watering, should I water till I see run-off, or leach with 5-10 gallons each? Will the plants suffer if I wash all the nutrients from the medium and they are already deficient? Is this harvest totally screwed?

 

[hazy]

Hey rip.
I'm going to try to correct any mistakes i made in my previous posts.
I wish I could help more, but I'm no real expert. I have been studying up on the effects of pH on plants though. I've come to the conclusion that most of the troubles around here are from low pH. Especially for those of us who grow in soil less mediums, which I think your pro mix is.

Even with your nute regimen, which I don't think was excessive, nutes tend to accumulate and the pH drops inside the medium over time. Your high pH runoff earlier was a sure indicator that nutes were concentrated.

I said earlier that high pH locks out and low pH increases uptake of nutes. That's a bit simplified.
Acid soil(low pH), cause toxicities of iron, manganese,zinc, boron, and copper and causes deficiencies of calcium, magnesium, and these precipitate with phosphorous making it unavailable, so you might see red leaf stems. These excessive uptakes of metals locks out molybdenum, which causes leaves to yellow.

Cal-mag deficiencies are limited to low pH mediums.
Manganese toxicities from low pH cause edges of leaves to lighten, dead spots, leaf crinkling, and cupping, also the death of fine roots.

I mentioned aluminum uptake being increased locking out iron, but that would only apply to soil. In a soil less medium, iron would not be restricted by excess aluminum, and would be taken up excessively too, causing iron toxicities.

So, you must have a problem stemming from low pH. I think that flushing with clean water and then using nutes with the last water you pour through while flushing, is all you can do. You have to add back the nutes to keep from having deficiencies. But having all that old stuff out is good, which I guess you already did. The old growth won't recover.
I don't think your harvest is screwed.

Are the back two, different strains than the front two?
I have a Purple Kush that looks like yours, even though the rest are ok. I can see a little twisting on the rest of the plants, and that means I need to give em a flush too. That PK feeds different than the rest though.

I hope I've been of some help. Only good new growth will tell.

 

[ripvanstinkle]

Thanks Hazy. That does sound quite a bit like what is going on. Do I need to flush a soiless medium with twice it's volume of water?

The back two are Afgooey. The front two are Grape Ape. I thought one was chunky cheese, but now believe I might have mixed up the clones.

 

[hazy]

yeah, give em a good flush. twice volume is good.
I was saying that my PK is looking like yours. Also have a double purple doja that's showing a yellowing of the small bud leaves. and a c99was looking a little light too. I backed off on the nutes, i'm already running a fairly light mix of nutes, and the c99 looks much greener. The Pk a little bit better. But I need to flush the pk and dpd, just such a pain in the ass, i'm going to just keep hitting them with light nutes and sometime plain water. I'd hate to break a stem messing with them.